Thanks Scott for designing and P10 Dave for drawing! Awhile back I took what Dave would call a "Flyer", and built the "Redeye" baby lab using the Peerless 830987, a 3 inch aluminum driver. Because the Parameters of the 830987 are relatively close to those of the Aura NS3, for which the "redeye" was designed, I didn't think I took tooooo much of a chance on how these would turn out. I don't have measurement tools however, listening to test tones, these little guys solidly reach down to 55-60 hz...not bad at all for a 10 inch tall desktop! They sound very good on most stuff but I have noticed, with some female voices, theses aluminum 830987's can sound a tad "harsh". In retrospect, I would certainly build these little baby labs again, but I would use a different driver. I keep threatening myself that I could splurge and treat myself to the FF85's!