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Old 20th December 2011
  #2
I set up a 1962 bomb shelter as an echo chamber years ago. I used a 200 watt BGW power amp and a single JBL 4403A. That was placed in the corner of the room. Then 2 mics were placed at the other end, a couple of cheapo condensers is ok.

Then you can add stuff to attempt to null out room nodes. I built a one knob compress/expand circuit that had the efffect of "adjusting" the reverb time, something you will want to employ. You can use a compressor to lengthen the reverb time or an expander like an Aphex 612/622 to shorten the reverb time.