Budget Echo Chamber

Hello, all! My name is Allyn Allbright. I'm located in South Georgia, US. I'm planning on designing and building an old-school 'echo chamber' within the confines of available space in my home studio. I'm wondering if a room of drywall walls, ceilings, and floors with high gloss paint would suffice. Naturally, I will be using the standard method of routing an aux send to a speaker in the room, with a stereo mic pair picking up the signal. I'm looking for input on what size to make the room. My maximum build could be up to 18'x10' (the ceilings are 12'), but I would prefer to not use up all of that space, so I'm wondering: What would be the minimum dimensions to create a decent reverb chamber... I'm hoping for a Motown-esque sound. For what it's worth, I am not interested in digital reverb, so hold your suggestions in that vein! Thanks, Allyn

Gpysum with rockwool behind has some absorption at low-medium frequencies. It might work but I personally hate the sound of gypsum. Perhaps a mixture with wood diffusers might do the trick. Stone is a great choice (but expensive). Cheapest choice is really red bricks but I also don't like that option personally

I know you don't want digital, but another old school solution might save you a lot of space and still get that legacy sound. There are multiple projects out there for DIY plate reverb. This seems to be the definitive one: http://www.prosoundweb.com/recording/tapeop/plate/plate.shtml Here's another, based on the same design: http://homerecording.com/bbs/showthread.php?t=244927 I've been thinking about giving one a shot, just for grins. The geek factor is off the chart.

Wow! The thought of building a reverb plate had crossed my mind, but I dismissed the thought, guessing it would cost a lot more than an echo chamber... I may just go that route (or better yet, maybe combine the two: a plate reverb within an echo chamber... might yield interesting results!) Thanks, Brian!