Seymour Duncan Bass 400
 

I was hoping to find opinions on the Seymour Duncan Bass 400, produced at the end of the eighties.
I own one that I sent to a tech to be totally refurbished, and although it works perfectly, it is insanely loud, so much, that it is difficult to use it et more than 8 o'clock volume wise. Anyone here know those amps, what do you think. Is it possible to use an attenuator with s/s amps? Btw I use it with an 810 Ampeg SVT Classic Cab.