[DanBC]

> Use a dozen cheap foam panels to reduce unwanted room sound (placed closer to the vocals/instrument depending on situation). I tacked mine to a sheet of plywood so that it could be moved around.

This is a good suggestion. Acoustic panels can be made really cheaply and simply. Here's a couple of examples.

Old towels in a timber frame: https://www.youtube.com/watch?v=pABvTWSxOes

Aluminum / Aluminium frames with foam or insulation: https://www.youtube.com/watch?v=qczNxoG8s6o

I like the first video because he does a bit of minimal testing with a tone generator. I'd be interested to see more testing, using more realistic frequencies, in a room.

[andrew999]

Old towels is a good tip. Scrap carpet works too.