Incredibly clean sounding, state of the art (in terms of measurements), preamplifier and extender module. Just do a search and check out the many excellent reviews this unit has received. One of the cleanest sounding preamps I have ever owned. The Pre90 is the preamplifier. By attaching the extender Ext90 to the preamp Pre90 using the supplied cable, it adds several additional inputs to the preamp. $500 shipped with tracking and insurance.
I recently bought an integrated amplifier and so no longer need this and so I am reluctantly selling it. I forgot to include it in the pictures, but it also includes the RC-16A remote control. See pictures at US Audio Mart:
https://www.usaudiomart.com/details/650243514-topping-pre90-amp-ext90-solid-state-preamplifier-preamp/
