Originally Posted by JimmyM
Nothing. SWR heads have a lot of low end content in frequencies most cabs can't reproduce, and that diverts more wattage to them. Not saying that's a bad thing...I used to own an SWR amp myself...but it does mean that it won't be as loud as heads that cut off those lows.
On top of that, SWR's baked-in EQ signature has a deep notch in the lowmods that is where our "fat", and percieved loud/full sound is.
Try this. Not sure how many mid sweeps are on the 350x, but, turn the bass, or whatever the lowest eq knob is all the way left. Then set a midsweep to somewhere 80hz or so to add a little bass back in where your speakers can produce it. Then set another mid sweep to about 200-250hz or so and turn it up a good bit.
May not be your ideal tone, but help bring the lowend under control and put some "beef" in the sound.
If you're using your aural enhancer knob, keep it at noon or lower. Off until about noon adds more gain and helps get louder. Past noon starts to scoop more mids.