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Two black stacked audio units, preamplifier above input extender, multiple RCA and XLR ports visible

Topping Inc.

Topping Inc. Pre90 & Ext90 Preamplifier Combo 2 RCA 4 XLR

SKU CH-4ZB8-4WAK5

Fully balanced preamplifier combo with relay volume control adds two RCA and four XLR inputs, selectable XLR or RCA outputs, and ultra-low .3 µV noise for 145 dB dynamic range

  • TypeHeadphone Amplifier & Preamplifier
  • ColorBlack
  • Ultra-low 0.3 µV noise delivers 145 dB dynamic range
  • Relay volume control ensures precise channel balance and remote operation
  • Ext90 expands connectivity to two RCA and four XLR inputs
  • Selectable XLR or RCA outputs drive two amplifiers simultaneously
  • Safe volume limits protect speakers and hearing at power-on

Pre90 and Ext90 preamplifier combination

The Topping Pre90 preamplifier pairs with the Ext90 input extender to create a fully balanced stereo control centre. Together they deliver two RCA and four XLR stereo inputs, selectable XLR or RCA outputs, and relay-based volume control with remote operation. The system targets listeners who need multiple balanced sources and precise level matching.

Ultra-low noise and high dynamic range under

NFCA modules achieve 0.3 µV noise and a 145 dB dynamic range, maintaining a dark background during extended listening sessions. Relay volume control prevents channel imbalance at any level, while the safe-volume function caps output automatically when switching inputs or powering on, protecting downstream amplifiers and headphones.

Replaces separate preamp and input selector boxes

The combo consolidates a high-performance preamplifier and a multi-input expander into one stack, removing the need for a standalone switcher and extra interconnects. The upgrade is worthwhile when a system has grown beyond a single balanced source and requires volume memory per input or output without adding noise or distortion.

Highlights

  • Ultra-low 0.3 µV noise delivers 145 dB dynamic range
  • Relay volume control ensures precise channel balance and remote operation
  • Ext90 expands connectivity to two RCA and four XLR inputs
  • Selectable XLR or RCA outputs drive two amplifiers simultaneously
  • Safe volume limits protect speakers and hearing at power-on

Specifications

BrandTOPPING
ModelAMP120
TypeHeadphone Amplifier & Preamplifier
ColorBlack

Questions about this item

How quiet is the preamp when it runs continuously all day?

The Pre90 uses NFCA modules with ultra-low noise of 0.3 µV and a dynamic range of 145 dB, so the background stays silent even during extended listening sessions.

Which source components and cables must I already own to connect everything?

You need sources with RCA or XLR outputs — such as a DAC, streamer or turntable phono stage — plus matching RCA or XLR interconnect cables for each input you plan to use.

Will the Ext90 work with my older power amplifier that only has RCA inputs?

Yes, the Pre90 can be set to RCA-only output so the balanced XLR path is disabled and the signal feeds your legacy amp through its RCA connectors.

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