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Topping Pre90 Preamplifier - Balanced HIFI Preamplifier
Topping Ext90 - Input Extender for Pre90

- Hi-Res Audio
- NFCA Modules
- Remote Control
- 0.5dB/Step Volume Control Relay
- <0.00007% THD+N
- 6-way input selections (with Ext90) 2x RCA + 4x XLR
- 145dB Dynamic Range
- <0.3uVrms Noise (actual noise level obtained by boosting the noise of Pre90 by 100 times using a low noise amplifier in front of the APX555B then dividing the measured noise by 100 times)
- Channel Crosstalk -140dB

Ultra-High Performance NFCA Modules
Pre90 use the similar NFCA module from flagship A90. Voltage current hybrid feedback architecture along with UHGF technology provides excellent DC and AC performance. Ultra-low noise of 0.3uV is miles ahead of the competition, giving an absurdly high dynamic range of 145dB and no audible noise and darkest background

Fully Balanced Amplifier
Pre90 adopts full balanced structure which can handle balanced and single-ended signal processing. The output can be balanced, single-ended signal processing. The output can be balanced, single-ended, balanced+single-ended. With the both way of input in addition to the normal preamplifier usage, Pre90 can be used for “”balanced to single-ended or “single-ended to balanced” signal conversion

An Amplifier for Better Audio Signal
With the help of maximum gain +16dB, Pre90s could easily amplify the weak input signal to acceptable level of next amplifier. It is worth mentioning that since the noise is as low as 0.3uVrms, this step does not bring in audible noise while amplifying the signal

Relay Volume Control
A large number of high quality Japanese small signal relays are used for volume control of Pre90s. Bring the advantages of precise control, remote control, longevity, and complete channel balance. If the volume was set high while turn on or switch in, Pre90 will automatically reduced to a safe volume to void your speakers/headphones blown by sudden high volume.

Selectable XLR/RCA Output.
The output of Pre90 could be config to XLR only, RCA Only or “XLR+RCA”. Therefore, the amplifier signal can be connected to two different amplifiers. Moreover when it working with a Ext90, they could provide totally 2*RCA and 4*XLR stereo inputs. This is enough for multi source systems.

EXT90 Could Extend More Inputs
A standard Pre90 provide you 1*RCA and 1*XLR stereo inputs. But when it working with a Ext90, they could provide totally 2*RCA and 4*XLR stereo inputs. This is enough for multi source systems.

Safe Volume, No Shocking Sound
The safe volume feature on Pre90 will kick in when the saved volume of the target input or output exceeds the set safe volume, and reduce the output to safe volume, protecting your expensive equipment and your priceless hearing. The safe volume function can be turned off in the settings