[quote name='Bill Fitzmaurice' timestamp='1401279790' post='2461938']
Usually the issue is midbass boom, which you need to notch out. I'd make the filters all -6dB cut, each at a different frequency, say at 80Hz, 120Hz, 160Hz, 200Hz and 250Hz. Then you can scroll up through them to find the right one for the room you're in. If your cab tends to run on the boomy side anyway you might want to make it a -10dB cut. Most guys like a tone that's fat in the lows and the mids, and getting it as often as not doesn't mean boosting the lows and mids but rather taming the midbass that can mask them.
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That's great, thanks for that.
Might be a good idea for a head manufacturer to have a 'no room boom' dial with those five options to try :-)
Thinking about it, I have a vague memory of Dave Marks demonstrating an EBS head, and his description of the 'notch' control sounded similar to this.