I bought Spector NS-2A from forumite - the bass was upgraded with active EMG PJ pickups and Spector Tone Pump preamp. The Tone Pump preamp is two band and it's only boost - no cut. Problem is, that the treble knob doesn't work how it should (I think). There is very small change in the overall tone, when it's moved from zero to max boost. The change is almost inaudible. Acording to Tone Pump manual, the boost should be around 18db. Well, almost nothing and 18 db is quite a big difference. Anyways my rig - Ampeg SVT-200t + Eden 210t + Eden 210XLT. Tried with my rig, KORG PX4-B Pandora + headphones and also thru Eden Traveler head and Eden 210XLT cab. It's not weak battery. I tried that, bass boost works like it should - wonderfuly. But the treble knob does almost nothing... Any ideas where the problem can be? Thanks a lot.