Anyone using a speaker style grow box.

I was thinking of getting into a stealth speaker grow system. I have seen nice soil grow speaker cabinets for $225 shipped on ebay. I figure that is not bad considering when I add up the cost of fans, mylar, a suitable speaker from second hand shop, power strip, wiring, and carbon filtration. I have nice led lights to replace the cfl's located in the upper portion of he speaker. I plan on growing maybe a couple of autos max in one speaker. I question whether 24" height will be enough or should I opt for a 32" high speaker for safe measure? Here is one of the units I have been browsing. Your thoughts stealth micro growers?

http://www.ebay.com/itm/SOIL-Speaker-Grow-Cabinet-100-Stealth-Inconspicuous-Odor-Managed-/131152984458?pt=US_Hydroponics&hash=item1e8953b98a