I've checked OFD's site and eBay store and I really can't see how or why these homemade speakers can be any better than the brand stuff. Less expensive, yes; I once made a set of 2x12" w/horns PA cabs that sounded wonderfully warm and sturdy. The cost back then was way below what a similar brand package would cost. The same seems true for the Proton lines. So it it the cost savings or the sound that is so attractive?