Loose low end

[daz]

I think thats a rhetorical question, yes? Because i'm sure you know they mean lows that are too far down the freq range for guitar and therefore cause muddiness. I know it's said that the low end on a guitar only extends so low, but it can extend lower than is desirable in some amps. That was part of my issue....it wasn't just flabby bass, but the lows were so far down the spectrum that it was an issue because if i turned the bass down to get rid of it, along with those "sub lows" went the bass i WANT too. If i turned it up to get the lows i wanted, along with those came the sub lows too, muddying up the tone. I was never able to remove then with tone stack values or coupling cap changed. What did it was changes to the PSU and a few changes in what places withing the preamp the most and least gain boosts were taking place.

Anyways, i still think you were being tongue in cheek, but if not thats what i think is meant by sub lows.

[Chuck H]

Yeh, I see that alot too. Because of context I've always figured it to mean anything below about 50hz. Which is, by some, supposed not to be reproduced by a guitar amp. But in practice you can actually hear the difference between a .047uf and a .022uf decoupling cap off a standard gain stage. There must be at least some fundamental interaction due to LF response in the amp that affects the final tone even if the your not getting much below 70hz out of the speaker. So the idea that just chopping off the "sub lows" will only eliminate non audible frequencies, and not be noticable otherwise has to be wrong. I have noticed that anything above about a .0047 cap feeding the input of a standard LTP PI seems to make no difference. But that's because of the impedance relationships in that circuit.

Chuck

[guitician]

You have to realize that the roll-offs of each coupling cap add up to become sharper. Working with one cap is just -3db per octave, but four stages with the same caps will be -24db per octave. This will let you take out the lows below 50hz without effecting the guitars fundamentals.