Ok I am not sure if it's an issue or not. I just bought a used Jeff Berlin combo amp this past weekend. I set my amp all flat but torY I just wanted to fool around and make sure everything is working fine on the amp since I have a 14 day return policy. I messed around with all the eq knobs and noticed that when I turn the treble knob there's hardly Amy difference in change. The other 3 eq knobs you can tell a drastic change between 7 and 5 o clock. I know the Berlin combo has no tweeter but is this normal. When I turn up the vfe? Not the vle and mess with thetreble I can hear a hiss with the treble all they wAy up but he actual tone there is hardly any dofference. Maybe it's he p bass with flats? I tried it with my streamer and still the same. No change. My question. Is this an easy fix. Is it in my head or should there be a huge difference in sound when I turn the treble. When I had my markbass f1 I can tell the diferencE. Think guitar center fix this problem for me? Will it cost me $$$ to repair it? Or just live with it? The tone is amazing with my eq set flat. I can always change the treble on my streamer but can't dial it in with my passive basses.