Harmonic recovery System


Not reall an amp, preamp question, but has anyone used this tweak.
I think its basically an added gain stage. If anyone has used it , please let me know youre impressions. Thanks
shasonmusic

Showing 1 response by gonglee3

How much is the mod to 9000es, and where can I get it done?

What does it do - how does it improve the sound?
Is the stock 9000es pretty good as well?