Thick wool and or cotton design blankets work well. I use IKEA Indian (2 x 4) area rugs with *excellent* results on walls, too. The rugs are comprised of sewn 'rolled' cotton bundles which act both as absorbers and diffusers. Them rugs come in real funky color patterns and are a mere $4.95 each! As for slap echo, I use Golden Sound Acoustic Discs in ceiling corners. Awesome little gadgets they are.
Disclaimer: I am a nomad. Otherwise I would just pay Rives Audio. Seems everybody's happy with him...
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Disclaimer: I am a nomad. Otherwise I would just pay Rives Audio. Seems everybody's happy with him...
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