The PRO-20 Dynamic Processor, as the model name suggests, is like an audio enhancer. It “un-limits or decompress” the signal to expand its dynamics and reduce background noise. So what you get when you run a signal through it is a sharper sounding, more “lively” reproduction and a lowered noise floor. With a tape deck and older turntables are where the improvements are more sonically evident. Even a tuner benefited when it ran its analog out through the PRO-20. This is a “fun” piece of vintage audio gear that is worth experimenting in your system for $50! Its very easy to use. Just plugged it between your source unit and preamp or integrated amp and adjust accordingly to your liking.
Cosmetically, there are some scuff marks here and there but nothing major. Unit actually looks really good for its age. We don’t have the original box but will securely pack it for safe shipping.