A fully balanced Class-D amplifier for compact systems

A fully-balanced Class-D power amplifier built for precision listening in small spaces, the Topping Mini 300 brings high-output performance to desks and compact listening environments. Delivering up to 140W per channel into 4Ω with distortion under 0.0005% at 8Ω, it’s designed to power passive speakers cleanly, quietly, and efficiently. Its fully balanced topology rejects interference, its 124dB signal-to-noise ratio keeps the background silent, and its compact form factor allows it to disappear into your workspace.

Compact size, full-scale performance

Measuring just 6.5 inches across, the Mini 300 fits easily between DACs, preamps, or monitors, giving system builders the power of a full-size amplifier without consuming their desk. Inside, a precision-engineered Class-D circuit outputs 140 watts per channel into 4Ω and 65 watts into 8Ω, enough to drive most bookshelf or nearfield monitors with effortless control.
The all-aluminum enclosure functions as both chassis and heat sink. Side and bottom vents dissipate warmth silently, maintaining thermal stability even during extended sessions.

Balanced architecture, balanced sound

A fully-balanced Class-D circuit means that each channel has its own complete amplification path, ensuring total separation between left and right. This design minimizes crosstalk and rejects external noise—especially useful for studio or desktop environments filled with power supplies and signal cables.
The result is a vanishingly quiet noise floor of less than 15μVrms and a 124dB signal-to-noise ratio. The Mini 300 reproduces recordings with composure, stability, and a sense of air that reflects the purity of its circuit design.

Low distortion, high precision

At 5W into 8Ω, total harmonic distortion plus noise measures below 0.0004%. That’s well beneath the threshold of audibility and a key reason the Mini 300 maintains image focus and tonal neutrality across the frequency range.
In practice, this translates to clear transient edges, consistent stereo imaging, and dynamic articulation that remains stable even at low volumes.

Input flexibility

TOPPING equips the Mini 300 with both balanced TRS and unbalanced RCA inputs. Balanced connections are ideal for longer cable runs or electrically noisy environments, while RCA ensures compatibility with traditional home audio sources. A front-panel switch toggles between the two, giving you seamless control over your input path.

System integration and protection

The rear-panel 12V trigger allows the Mini 300 to power on and off in sync with your DAC or preamp—no need to reach behind the stack.
Protection circuits guard against overcurrent and overheating, ensuring silent operation and long-term reliability. Power transitions are muted to eliminate pops or thumps through connected speakers.

Availability

The Topping Mini 300 is available now on Apos Audio.