Right. What I'm trying to say, skippy, is that an overall sealed-box speaker-system Q of 0.707 (rounded to 0.71) is the best balance between bass and transient response. But a very large sealed-box system that I had built (3.02 cubic feet!) using a "made-in-USA" RatShack 40-1026 12" poly woofer (discontinued) gave me an overall Q of 1.6! ARRRGH! That's because that 1026 was a fairly high-Q woofer (Qts=0.665 and Vas=15.5 cubic feet, according to the specs). No wonder - though that large system has plenty of bass extension, it has a flaw in the mid-bass which an "enthusiast"-level music listener will notice. That's almost
as crappy as the bass on those Sony MDR-V700DJ headphones that I listened to a couple of weeks ago! And based on the *Fs / Qes* formula, the 1026 works best in a sealed enclosure - and a REALLY huge one, at that!
BTW, I just checked the Qes and Fs specs of the 40-1354A, and found out (using the *Fs / Qes* formula) that it works best in a vented bass-reflex enclosure. The approximate internal dimensions of that vented bass-reflex box that delivers "optimally" flat response from the 1354's (not including the thickness of the cabinet material) are:
Vent/port tuned somewhere between 55Hz and 57Hz
Volume=0.49 cu. ft./13.87 liters
Heheheh... That's almost the EXACT actual internal volume of that Hawaii 5.0 box for that 40-1354A full-range speaker!!! You guys are nuts trying to extract that last ounce of bass extension by putting those 1354's in a WAY too big voigt-pipe box!
You'll end up with that speaker being forced to reproduce frequencies that it normally can't do! Face it, build that 1354 in that Hawaii 5.0 box - and settle for bass extension down to only 50Hz. DUH!
And another thing, here are two new-model RatShack full-range dual-cone speakers someone should try in an oversized voigt pipe box (though I haven't heard either speaker): the five-inch 40-1041 and the six-inch 40-1042. With a relatively large cone area (for a full-range speaker) and "only" an eight-ounce magnet (for the 1042) or a 3.5-ounce magnet (for the 1041), its Qts should be somewhat on the high side.