Below is a link where Servodrive did a test and put the results on there web page, I can also dig up sheets where they did the tests on there old TPL series of subs where they compared the standard reflex vs a regular "W" folded horn I forget if was loaded with 4-15's or 4-18's vs there servodrive, and both horn loaded enclosures were still lower in distortion than what the reflex was.Also could you send a link to your web site I'd like to read about this Acoustic Lever your talking about. I've heard you mention something about it on another board.