A large number of the posts I’m reading are about people being displeased with the sound of their amps. (too much bass, not enough bass, too dark, too bright, woolly, mushy, muddy, etc, etc) Suggested remedies usually include replacing the speaker, replacing the tube, or adding an external EQ, all of which cost money and, if unsuccessful, extra annoyance.
Voxman frequently reminds us to get the amp off the floor or tip it back, which will certainly brighten/lighten and project the sound, but it won’t clean up mud or add much depth.
I would suggest that anyone unhappy with the sound or tone of their closed back amp try stuffing the speaker compartment with some kind of sound insulating material. Retrobob suggested this to me (http://www.voxamps.com/forum/topic.php?id=3233 for the whole story) and it completely transformed the sound of my VT30, which, to me, lacked bass and was kind of honky in the mids. It now has deeper bass when I need it, and much clearer and tighter sound at all frequencies and volume levels. Some amp models sound quite different than they did before, and IMO, much better.
I used a pillow that happened to be the right size, so there was no cost involved. Just be careful to not let it touch the cone, block any ventilation holes that might be there, or have particles that could get into the voice coil/air gap. Basically, remove the back, add the stuffing, replace the back. Make sure all the screws are nice and tight.
I’d definitely suggest this as a first step, ahead of buying things like speakers, tubes or EQs. If you don’t like the difference it makes, it’s easily undoable.
Retrobob said this has been suggested before (and largely ignored), but I haven’t seen it, so I thought it would be worth putting out there again.
I love the sound of my amp now, and I was quite disillusioned about it before.