Future Audiophile Reviews the TOPPING Pre90

Note: This article is based upon the video "Topping Pre90 Stereo Preamplifier Reviewed" written by Steven Stone and published on Future Audiophile; it is printed here in partnership with Future Audiophile. The review was originally posted on October 30th, 2022. The TOPPING Pre90 is available for purchase on Apos Audio. 

Every audio system has a preamplifier somewhere in the signal chain. In an all-digital system, the digital audio converter often includes a volume control, which is in essence a single-source preamplifier. In analog systems, the preamplifier is usually a freestanding component that allows for source switching and adjusting volume levels. While these are simple tasks, they are critically important if you expect to get optimal performance out of your audio system.

What Makes the Topping Pre90 Special?

Topping has been producing this analog preamplifier since 2016. The internal circuitry utilizes true balanced differential circuit topology, which offers superior signal-to-noise to a single-ended circuit. With provisions for both single-ended and XLR balanced inputs and outputs and the capability to add an extension chassis (the Ext90) to get additional input options, the Pre90 can be incorporated successfully into a wide variety of audio systems. It also delivers state-of-the-art signal-to-noise at 124 dB, as well as distortion specifications that rival preamplifiers costing 20 times more. 

The front and back view of Topping’s $599 preamp.

Why Should You Care About the Topping Pre90?

  • If you want to use both balanced and unbalanced analog sources and need to send those signals to a balanced and/or unbalanced amplifier, powered speaker, or subwoofer, the Topping PRE90 has the necessary inputs and outputs to do that.
  • The Topping Pre90 has a monochrome front-panel display that features volume level adjustments in 0.5-dB steps, which allows for small volume changes. It also displays your current input and output status.
  • In addition to making volume adjustments via the included remote control, you can use the volume control knob on the Pre90’s front faceplate. So, if you misplace your remote or it fails to function, you can still adjust the volume. Also, there’s a special “safe volume” option that prevents the preamplifier from sending out too loud a signal when you change input sources.
  • The Pre90 is only 8.75 inches wide, which matches Topping’s other Series 90 components, such as the D90SE DAC.

A stack of Topping electronics paired with powered speakers.

Some Things You Might Not Like About the Topping Pre90

The remote sucks. There’s no other way to describe a remote control that can’t reliably handle any distance greater than five feet. Plus, if you hold the remote too far above, below, or to the side of the IR sensor on the Pre90, it will not work. You can be standing only three feet away, within hand’s reach, and the remote’s commands still won’t work reliably!

The Pre90 supports one balanced and one single-ended input. If you require more, you must ante up for the $249 Ext90 input extender.

The umbilical cord between the Pre90 and the Ext90 is too short to allow for anything but an over/under placement of the two components. A longer cable would allow for a side-by-side placement option.

Listening To The Topping Pre90 Stereo Preamp…

After conducting a myriad of A/B comparisons and bypass tests with the Topping Pre90 in and out of the signal chain, I concluded that I could not hear any differences between when it was part of the signal chain and when it was not, which for me is the definition of a transparent component. 

The tracks I listened to included “26” from Lauv’s latest release, All 4 Nothing. This song features a slick electronic mix with a plaintive lead vocal. The 44.1/24 MQA version on Tidal sounds way better than the YouTube video version. For a more acoustic cut featuring simple instrumentation, give “Hey Ari” a listen.

I also used music from Hawktail, a new four-piece acoustic band made up of Berkeley Music grads who play a unique kind of old-timey/modern jazz genre. Their music can go from wistfully mellow to hardcore crunch in an instant. If you like unvarnished musical virtuosity, I think you’ll like Hawktail.

Does The Topping Pre90 Hold Its Value?

Pretty much, yes. Good analog electronics tend to have much longer working lives than digital components because the specifications and features don’t change as rapidly. An analog preamplifier like the Pre90 only has to do three things (select a source, adjust the level of that source, and have low noise), and the Pre90 does all these things well…and will continue to do so for years.

Topping Pre90 Stereo Preamp Reviewed by Steven Stone

Who Is the Competition for the Topping Pre90?

Even at its modest price, the Topping Pre90 has some direct competition. There’s Schiit’s $399 Saga + and $299 Saga S, but they both lack provisions for balanced inputs and outputs. If you require more input options that the Pre90 offers, Schiit’s $599 Freya S (review) could be an option. It has both single-ended and balanced connections and can operate as a passive volume control.

Gustard recently introduced its new flagship preamplifier, the $599 P26. The P26 is also a fully balanced design with a remote, but it does not have as many input options. And, instead of a dedicated proprietary differential discrete amplifier section, it employs op-amps. But even using op-amps, the Gustard achieves a 130-dB signal-to-noise, which is better than most digital audio converters.

Another option is the $899 Schiit Freya +. Instead of using the transistor-based differential output section of the Schiit Audio Freya S (S stands for solid-state), the Freya + employs four 6NS7 tubes. It also takes MOSFET tube replacements, which are available from Schiit. The primary disadvantage of the Freya + is that it generates a lot more heat than the solid-state Topping Pre90, due to its use of tubes.

Final Thoughts On The Topping Pre90 Stereo Preamp…

It used to be that every audio system required an analog preamplifier to select sources and adjust the system’s volume level. These days, if you have an all-digital audio system, you may or may not need an analog preamplifier. If your digital audio converter has a volume control and all your sources are digital, your DAC’s volume control and input selectors can deliver all the preamplifier functionality you will require. But if you have both analog and digital sources and your DAC does not have any analog inputs (few do), you are going to need an analog preamplifier.

The Topping Pre90 is a transparent stereo preamp that does not affect the signal chain in any way that I could hear. You can spend a lot more for a preamplifier, and you may require certain special features—like a phase reversal switch or balance control—that the Pre90 does not offer. But in terms of overall transparency and sonic performance, you will find it extremely difficult to do better sonically or find a better overall value than a Topping Pre90.