{"title":"Nov 2025 (Apos)","description":"","products":[{"product_id":"topping-dx5-ii-dac-amp","title":"TOPPING DX5 II DAC\/Amp","description":"\u003ch1\u003e\n\u003cstrong\u003eA big upgrade for a proven performer\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h1\u003e\n\u003cp\u003eThe DX5 II is TOPPING’s new fully balanced DAC and headphone amp combo. With upgraded internals, broader connectivity, and user-focused improvements, it builds on the DX5 without reinventing the wheel. Dual ES9039Q2M DACs provide the decoding core, while an all-new X-Hybrid amplifier circuit drives your headphones, plus the updated Aurora UI and PEQ system offer precise and powerful sound tailoring. \u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eNew dual DAC design\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eTwo ES9039Q2M chips handle digital conversion—one per channel. That means lower crosstalk, better imaging, and an improvement in specs: 133dB SNR, 133dB dynamic range, and distortion as low as 0.00006%.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eX-Hybrid headphone amp circuit\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe DX5 II replaces the NFCA module with an original triple-stage hybrid amp circuit. It uses a discrete input stage, op-amp gain stage, and discrete output stage. The result is high efficiency, improved thermals, and precise delivery at every volume. Power output peaks at 7600mW x2 into 16Ω—more than enough for basically any headphone.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eBalanced audio in a compact case\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eWith a quad-channel fully-balanced headphone amplifier, the DX5 II fits serious hardware into a small chassis. It offers 4.4mm balanced, 4-pin XLR balanced, and 6.35mm single-ended outputs. \u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003e10-band high-precision PEQ\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe desktop software lets you tweak 10 independent frequency bands—adjusting frequency, gain, and Q-factor. Save multiple profiles, apply different EQ to your speakers and headphones, and import and export curves. \u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eAurora UI\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eA 2.0\" full-color screen, a pressable knob, and three buttons make for quick, clear control. Change your background color. Choose between FFT, VU meter, or playback info display. Assign the knob to control whatever you use most. \u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eWireless support with LDAC\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eBuilt around the QCC5125 chip, the DX5 II supports Bluetooth 5.1 with LDAC, aptX HD, aptX Adaptive, AAC, and SBC. You get up to 96kHz\/24-bit streaming without cables—useful for TV, tablet, or streaming box connections.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eUSB with XMOS XU-316\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe USB input uses the XU316 interface and supports up to PCM 768kHz\/32-bit and native DSD512. It works with Windows, macOS, Linux, iOS, and Android. For Windows users, just install the Thesycon driver to enable ASIO mode and fine-grain control.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003ePreamp mode\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eYou can connect active speakers or power amps directly using preamp mode. Adjust volume from the DX5 II’s front panel or remote. Each input and output remembers its volume level, so you won’t have to readjust every time you switch.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eSelf-developed IV conversion\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eTOPPING’s in-house current-to-voltage (I\/V) stage is compact and efficient, enabling lower distortion and noise than typical reference designs. By designing their own I\/V stage, they can extract more from the DAC chip without bloating the form factor.\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDual ES9039Q2M DACs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eNew X-Hybrid triple-stage headphone amp\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFully balanced headphone output\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSNR: 133dB; DNR: 133dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTHD+N: \u0026lt;0.00006%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutput power: 7600mW x2 @16Ω\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e10-band PEQ with desktop software\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAurora UI with full-color screen\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBluetooth 5.1 with LDAC and aptX HD\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB input with XMOS XU316 and DSD512 support\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePreamp mode with volume memory\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e12V trigger in\/out\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSelf-developed I\/V circuitry\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWorks with Windows, macOS, Linux, iOS, Android\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDAC chip: Dual ES9039Q2M\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTHD+N @1kHz (A-wt): \u0026lt;0.00006%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSNR @MAX OUT 1kHz (A-wt): 133dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDynamic range @1kHz (A-wt): 133dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutput power:\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003e7600mW x2 @16Ω THD+N\u0026lt;1%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e6400mW x2 @32Ω THD+N\u0026lt;1%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e4300mW x2 @64Ω THD+N\u0026lt;1%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e990mW x2 @300Ω THD+N\u0026lt;1%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e490mW x2 @600Ω THD+N\u0026lt;1%\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePEQ: 10-band, supports PCM up to 192kHz\/32bit\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eScreen: 2.0\" full-color with customizable display modes\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeadphone outputs: 6.35mm SE, 4.4mm balanced, 4-pin XLR balanced\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB: XMOS XU316, PCM768kHz\/32bit, DSD512 native\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBluetooth: QCC5125, supports LDAC\/aptX HD\/aptX Adaptive\/AAC\/SBC\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUI: Aurora UI, customizable knob and display, bilingual\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: 7.5in x 6.1in x 1.7in (19.0cm x 15.5cm x 4.4cm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n\u003cstrong\u003eWhat’s included\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRemote control\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB cable\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e6.35mm to 3.5mm adaptor\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAC cable\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBluetooth antenna\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eProduct information card\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TOPPING","offers":[{"title":"Black","offer_id":46529943437548,"sku":"APS-1044-2","price":299.0,"currency_code":"USD","in_stock":true},{"title":"White","offer_id":46536463417580,"sku":"APS-1044-3","price":299.0,"currency_code":"USD","in_stock":true},{"title":"Silver","offer_id":46529943404780,"sku":"APS-1044-1","price":299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0225\/2721\/3642\/files\/apos-audio-topping-headphone-dac-amp-topping-dx5-ii-dac-amp-1171890122.jpg?v=1749248688"},{"product_id":"topping-dx9-discrete-dac-amp","title":"TOPPING DX9 Discrete DAC\/Amp","description":"\u003ch1\u003e\u003cstrong\u003eThe future of discrete 1-bit design\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eA fully balanced DAC and headphone amplifier made for those who build their listening chains around precision. The DX9 Discrete is a rethinking of Topping’s flagship architecture from the ground up. Its self-developed 16-element PSRM 1-bit DAC eliminates conventional chip limitations, delivering micro-detail and tonal accuracy that extend deep into the noise floor. The six-channel discrete NFCA headphone amplifier pushes 7,080mW ×2 into 32Ω loads with near-zero distortion, while the ten-band PEQ and fully-balanced hybrid relay volume control let you tailor your playback with surgical control. Use it as a transparent DAC for active monitors, a powerful headphone amplifier for high-impedance cans, or a pristine preamp for your main system.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eDX9 Discrete – What’s New? \u003c\/strong\u003e\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eDX9 Discrete\u003c\/th\u003e\n\u003cth\u003eDX9\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDAC Architecture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16-Element PSRM\u003c\/td\u003e\n\u003ctd\u003eAK4499EQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTHD+N @1kHz (A-wt)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.00006%\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.00007%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChannel Crosstalk\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-136dB @1kHz\u003c\/td\u003e\n\u003ctd\u003e-125dB @1kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDSP Config\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003ctd\u003eNot Supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePEQ\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTen-Band High-Precision PEQ\u003c\/td\u003e\n\u003ctd\u003eNot Supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003e1-bit done right\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eTopping’s proprietary PSRM DAC architecture uses 16 discrete elements per channel to perform 1-bit decoding with nanosecond-level switching. By eliminating off-the-shelf DAC chips, the DX9 Discrete controls every step of the digital-to-analog process. The result is extraordinary linearity and clarity: 131dB SNR, \u0026lt;0.00006% THD+N, and perfectly stable channel balance.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eGoodbye to jitter\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eA CPLD precision clock system and dual-stage jitter suppression circuit keep the digital signal clean. The AK4118 receiver handles coaxial, optical, and AES inputs with less than 50ps RMS jitter, supporting PCM up to 768kHz and DSD512. Music sounds defined and stable, with transients intact and decay left untouched.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eBalanced power from end to end\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe DX9 Discrete’s six-channel discrete NFCA amplifier is built for demanding headphones. Each channel operates independently, producing up to 7,080mW ×2 at 32Ω with noise below 0.5µVrms (balanced) and 1.1µVrms (single-ended). The sound stays quiet, composed, and distortion-free no matter how far you turn the knob.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003ePrecision volume you can trust\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe fully-balanced hybrid relay volume control blends relay switching with a resistor network for exact level adjustment. It eliminates channel imbalance at low volume and keeps stereo imaging razor-sharp. \u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eCustom-tuned I\/V conversion\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eTopping’s proprietary I\/V stage converts current to voltage using low-distortion op-amps and discrete components. It’s designed to unlock the PSRM’s full potential: dynamic, textured sound with a sense of air and physicality. \u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eTune to your taste\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe built-in ten-band high-precision PEQ lets you tailor your frequency response exactly how you like it. Adjust gain, Q-factor, and frequency for each band, or import target curves through Topping’s software. Save multiple profiles for headphones, speakers, or genres.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eCrossfeed done right\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe headphone crossfeed system uses convolution modeling of HRTF and room acoustics to create natural spatial cues. It reduces the “inside-your-head” effect common to headphones, making the stage sound wider and more realistic. There’s even a simplified BS2B mode for a gentler presentation.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eConnections for every occasion\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eWith eight digital inputs—USB, Bluetooth, two optical, two coaxial, AES, and IIS—the DX9 Discrete fits into any listening chain. IIS supports up to 768kHz PCM and DSD512. USB uses the XMOS XU-316 processor and Thesycon driver for bit-perfect playback on Windows and plug-and-play compatibility with other systems.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eOutput options your way\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eChoose between headphone, line, or preamp output—or run everything at once with All Output Mode. Outputs include XLR, RCA, 6.35mm, 4.4mm, and XLR-4, all using NEUTRIK connectors for reliable, professional-grade performance.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eWireless that holds its own\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe integrated Qualcomm QCC5125 Bluetooth 5.1 module supports LDAC, aptX Adaptive, aptX HD, aptX, AAC, and SBC. Stream lossless audio from your phone or laptop with high-resolution clarity and low latency.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eBuilt to last\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eA CNC-machined aluminum chassis, glass top panel, and soft ambient lighting give the DX9 Discrete a modern presence on your desk. The multifunction knob can be customized to your liking, and the 12V trigger syncs power with other gear. A solid aluminum remote adds convenience without clutter.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cstrong\u003eUser-friendly interface\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eDual 2.0-inch color displays powered by the Aurora UI let you switch between FFT spectrum, VU meters, and playback info. It’s intuitive, fast, and genuinely helpful. No manual needed.\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFully balanced DAC and headphone amplifier combo\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSelf-developed 16-element PSRM 1-bit DAC architecture\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSix-channel discrete NFCA headphone amplifier\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUp to 7,080mW ×2 output power at 32Ω\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTHD+N \u0026lt;0.00006%, SNR 131dB, DNR 131dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFully balanced hybrid relay volume control\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTen-band high-precision PEQ with software control\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeadphone crossfeed with BS2B simplified mode\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eXMOS XU-316 USB processor supporting PCM 768kHz \/ DSD512\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBluetooth 5.1 with LDAC, aptX Adaptive, aptX HD, aptX, AAC, SBC\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e8 digital inputs (USB, BT, 2×OPT, 2×COAX, AES, IIS)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMultiple outputs: XLR, RCA, 6.35mm, 4.4mm, XLR-4\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAll NEUTRIK connectors for durability and precision fit\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAurora dual-display UI with FFT, VU, and playback info\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e12V trigger synchronization and programmable control knob\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCNC aluminum body with glass top and ambient lighting\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDAC Section\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003eDAC type: 16-element PSRM 1-bit discrete\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTHD+N @1kHz (A-wt): \u0026lt;0.00006%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSNR: 131dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDynamic range: 131dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eChannel crosstalk: –136dB @1kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20Hz–40kHz (±2dB)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutput level: 5Vrms (XLR), 2.5Vrms (RCA)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 100Ω (XLR), 50Ω (RCA)\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeadphone Amplifier\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003eTHD+N @1kHz (A-wt): \u0026lt;0.00007%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutput power: 7,080mW ×2 @32Ω (balanced)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eNoise: \u0026lt;0.5µVrms (balanced), \u0026lt;1.1µVrms (single-ended)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutput impedance: \u0026lt;0.1Ω\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eChannel crosstalk: –133dB @1kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGain: 12.5dB (low), 24.5dB (high)\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePre-Amplifier\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003eOutput level: 15Vpp (low), 48Vpp (high)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDynamic range: 131dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eChannel balance: 0.3dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eInputs\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003eUSB \/ BT \/ OPT1 \/ OPT2 \/ COAX1 \/ COAX2 \/ AES \/ IIS\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePCM: up to 768kHz \/ 32bit\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDSD: up to DSD512\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBluetooth codecs: LDAC, aptX Adaptive, aptX HD, aptX, AAC, SBC\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutputs\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003eLine\/Pre Out: XLR \/ RCA\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeadphone Out: 6.35mm \/ 4.4mm \/ XLR-4\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTrigger: 12V In\/Out\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePower\u003cbr\u003e\n\u003cul\u003e\n\u003cli\u003eAC input: 100–240V, 50–60Hz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePower consumption: dependent on mode\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions \u0026amp; 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It combines a four-channel balanced architecture, 0.1 dB relay volume control, three balanced combo inputs, one pair of XLR balanced outputs, independent power supplies, a color display, remote control, and measured performance down to 0.00005% THD+N.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFully-balanced signal path\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe Pre900 uses a four-channel reference-grade amplification circuit with true end-to-end differential design from input to output. Left and right channels are physically isolated to help suppress noise and electromagnetic interference, giving your source signal a clean path through the preamp.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eRelay volume control\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA relay array and high-precision resistor network give the Pre900 1,000 steps of volume adjustment in 0.1 dB increments. That means you can make small, repeatable changes without throwing off channel balance. Crosstalk is kept below -150 dB, guaranteeing that the left and right channels stay synchronized as volume changes.\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eHeadroom for demanding systems\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eWith output swing up to 69 Vpp and gain up to 19.9 dB, the Pre900 gives your system room to handle transient peaks without clipping. Its actual noise level is rated below 0.3 μVrms at low gain, so delicate signals can be amplified without adding audible noise.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eThree balanced inputs\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThree sets of stereo balanced combo inputs support both XLR and 6.35mm TRS connections. The inputs use Neutrik combo sockets, making the Pre900 easy to integrate with DACs, studio gear, and other balanced sources.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFocused balanced output\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe Pre900 includes one pair of XLR balanced outputs for a clean, dedicated signal path. It also supports 12V trigger input and output, so compatible upstream and downstream devices can power on and off together.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eResponsive control\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA 2.0-inch high-definition color display gives you clear access to playback information, FFT view, VU meter mode, gain, channel balance, safe volume, and other settings. Three touch buttons work with the multifunction knob, while the included infrared remote gives you control from your listening seat.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eBuilt for the 900 Series stack\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe Pre900 is designed to sit with TOPPING’s D900 DAC and A900 headphone amplifier. Its low-profile chassis, clean edge-line design, and matching visual language make it a natural fit for a compact flagship desktop system.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFour-channel fully-balanced preamplifier\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTrue end-to-end differential design\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e0.1 dB precision relay volume control\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1,000-step volume adjustment\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTHD+N rated at 0.00005% at 1kHz A-weighted\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTHD rated below 0.00003% from 20Hz to 20kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e151dB SNR and 151dB dynamic range\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThree stereo balanced combo inputs with XLR and 6.35mm TRS support\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOne pair of XLR balanced outputs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThree gain settings — low, medium, and high\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2.0-inch color display with multiple display modes\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSafe volume mode\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e12V trigger input and output\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eInfrared remote control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions: 13.0 x 7.9 x 2.2 in (33.0 x 20.0 x 5.7 cm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTHD+N at 1kHz A-weighted: 0.00005%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTHD at 20Hz–20kHz 90kBW: 0.00003%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSNR at max output 1kHz A-weighted: 151dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDynamic range at 1kHz A-weighted: 151dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20Hz–40kHz ±0.05dB, 20Hz–100kHz ±0.1dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutput level: 69Vpp at low gain, 65Vpp at medium gain, 65Vpp at high gain\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAP measured noise level: less than 0.7μVrms at low gain, less than 1.2μVrms at medium gain, less than 2.5μVrms at high gain\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eActual noise level: less than 0.3μVrms at low gain, less than 0.9μVrms at medium gain, less than 2.3μVrms at high gain\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eChannel crosstalk at 1kHz: -150dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eInput sensitivity: 25.3Vrms at low gain, 7.1Vrms at medium gain, 2.3Vrms at high gain\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eGain: 0dB low, +10.4dB medium, +19.9dB high\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eInput impedance: 20kΩ\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutput impedance: 100Ω\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eInputs: 3 x XLR and 6.35mm TRS combo stereo balanced inputs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutputs: XLR balanced preamp output\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTrigger: 12V trigger input and output\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat’s included\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTOPPING Pre900 preamplifier\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eInfrared remote control\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUser documentation\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TOPPING","offers":[{"title":"Default Title","offer_id":47620420927724,"sku":"APS-1328-1","price":1499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0225\/2721\/3642\/files\/apos-audio-topping-preamplifier-topping-pre900-fully-balanced-desktop-pre-amplifier-1238062924.jpg?v=1778640069"},{"product_id":"topping-dx1-ii-gaming-headphone-dac-amp","title":"TOPPING DX1 II Gaming Headphone DAC\/Amp","description":"\u003cp\u003e\u003cem\u003eNote: This product is backordered as we are waiting on the next production batch. 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Built for lossless music streaming from phones, tablets, computers, and network storage, it supports AirPlay, DLNA, UPnP, and multi-room playback while handling PCM up to 768kHz\/32-bit, DSD512, and MQA decoding. With a Cirrus Logic DAC, dual-band Wi-Fi, wired Ethernet support, and a compact aluminum chassis, the DP-01 adds modern streaming functionality without replacing the components you already use.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWireless streaming without compression\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eAirPlay, DLNA, and UPnP compatibility allow high-bitrate audio transmission for lossless playback while removing the physical limitations of wired connections. Stream from Apple Music, TIDAL, Spotify, Qobuz, Roon, and compatible applications with direct decoding handled by the player.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eBuilt for local libraries and network audio\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eConnect to NAS systems and shared storage through Roon and other music management platforms for centralized access to your collection. The DP-01 supports local library organization and network streaming in one compact component, making it easy to move between cloud services and stored media.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eMulti-room playback control\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eWhole-home audio support lets you play music across multiple rooms and adjust playback independently from a phone or control device. Volume can be tailored for each room while maintaining synchronized playback throughout your whole house.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCirrus Logic decoding with Hi-Res support\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eAt the center of the DP-01 is a Cirrus Logic CS43198 DAC chip designed for detailed playback and low-noise operation. It delivers nearly 130dB SNR with THD measured at -115dB, helping preserve low-level musical detail and maintain a quiet background. \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eStable processing for uninterrupted playback\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eAn audio-grade quad-core ARM Cortex-A7 processor provides the computing power needed for stable playback and responsive operation. The processor balances low power consumption with audio processing performance for reliable streaming and smooth navigation.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFlexible digital and analog connectivity\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eDigital outputs include USB, optical, and coaxial connections for compatibility with external DACs and downstream audio systems. Analog RCA line outputs allow direct connection to amplifiers and active speakers. Wired 100Mbps Ethernet and dual-band 2.4G\/5G Wi-Fi give you flexibility between wired stability and wireless convenience.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eTFT display with precise control\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA built-in 1.9-inch TFT color display shows playback status, audio format, network information, and system settings. A 100-step stepless volume control enables fine adjustments with smooth response, while onboard filter options and display controls allow playback customization.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSmart power management\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eIntegrated sleep timer and automatic power-off functions help reduce unnecessary power use. Set playback duration before bedtime or allow the device to shut down automatically after idle periods.\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLossless wireless music streaming\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAirPlay, DLNA, and UPnP support\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePCM 32-bit\/768kHz playback support\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDSD512 and MQA decoding\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCirrus Logic CS43198 DAC\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e100-step stepless volume control\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMulti-room audio playback\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e100Mbps Ethernet and dual-band Wi-Fi\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1.9-inch TFT color display\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB, optical, coaxial, and RCA outputs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDAC: Cirrus Logic CS43198\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eProcessor: Quad-core ARM Cortex-A7\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDisplay: 1.9-inch TFT color display\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePower input: USB-C, DC 5V\/2A\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWired network: 100Mbps Ethernet\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWireless network: 2.4G + 5G dual-band Wi-Fi\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB output: 1 x USB-A\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB output support: PCM 44.1kHz–768kHz, DSD64–DSD512 (DoP), MQA\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eS\/PDIF outputs: 1 x Optical, 1 x Coaxial\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOptical and coaxial support: PCM 44.1kHz–192kHz, DSD64 (DoP)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLine out: 1 x RCA\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAnalog playback support: PCM 44.1kHz–384kHz, DSD64–DSD256 (DoP), MQA\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutput level: 2.0Vrms\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTHD: 0.0003% @ 1kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSNR: 127dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCrosstalk: 118dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: 4.7 x 3.1 x 1.6 in (12.0 x 7.8 x 4.0 cm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: 0.77 lb (0.35 kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat’s included\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDP-01 lossless music streamer player\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWi-Fi antenna\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePower cable\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUser documentation\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"xDuoo","offers":[{"title":"Default Title","offer_id":47653255446764,"sku":"APS-1336-1","price":299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0225\/2721\/3642\/files\/apos-audio-xduoo-streaming-media-player-xduoo-dp-01-lossless-music-streamer-player-1239751971.jpg?v=1779388450"},{"product_id":"xduoo-a35-integrated-vacuum-tube-amplifier","title":"xDuoo A35 Integrated Vacuum Tube Amplifier","description":"\u003ch1\u003e\u003cstrong\u003eHand-wired ESS DAC Tube Power Amp\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eThe xDuoo A35 is a fully integrated vacuum tube amplifier built for two-channel listening systems. Its hand-wired analog circuit combines a 12AX7 voltage stage, dual 12AU7 driver tubes, and four matched EL34 output tubes in a traditional push-pull configuration capable of delivering 45 watts per channel. Integrated Bluetooth 5.1 connectivity, ESS DAC decoding, and infrared remote control support allow the A35 to function as both a classic stereo amplifier and a modern desktop audio centerpiece.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eClassic EL34 tube amplification\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe A35 uses a fully tube-based amplification design with one 12AX7 tube handling voltage amplification, two 12AU7 tubes driving the signal stage, and four EL34 tubes powering the output section. 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