[quote name='goingdownslow' timestamp='1415369240' post='2599686']
I have a Thumb Bass with a 2 band circuit, bass and treble controls have a definite usable effect. I was trying out a used later model with 3 band electronics and the treble control appeared not to be working. I bought the bass as it was a good price and thought the problem may be an easy fix. Turned out there was nothing wrong with it but it worked at a higher band than that on the two way and on my amp settings I have this frequency cut so turning it had no effect.
I prefer the 2 band circuit.
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Thanks - you are right, problem solved.
Wiring checked out by our techies at work - all fine.
When I got it home tried again - still appeared not to be working. Tried it through the practice amp and it works.
Eureka! - I'd been putting it through a amp head with a 'RnB' Modelling setting - completely EQing out the range I was trying to adjust!!!