Originally posted by mikebake
Actually, they develop huge bottom end sealed and in a small cabinet............
read on here
http://www.audioheritage.org/vbulletin/showthread.php?s=&threadid=1790
For a long, exhaustive treatise on the sub1500 and it's applications................
BTW, your Adire's are nice...........good stuff.........
That's odd. The low QTS indicates a motor more indicative of ported (it simply has too much motor for sealed apps), and the fairly high FS combined with the total Q appear ported oriented for best extention. Also, the very high efficiency is indicative of very large sealed applications as, quite contrary to poular belief, high efficiency drivers require large boxes
. Also, efficiency is an easy number to fudge a bit and still remain within "acceptable" test standards. I will go into standards if you are interested, but to keep you from being bored more than I am about to make you, I'll leave that alone unless it is requested
.
Just an FYI, a total Q (QTS) of .45 (it can be argued anywhere from .49-.4 so I round it off for arguements sake) and up is typically sealed, where less is ported. Very high Qs (over say 1.0) will work astoundingly well in dipole applications. However, I have found that many borderline QTS drivers with a low FS (say, sub 23 Hz or thereabouts) do fairly well in sealed applications. Another point of interest, QTS and FS are used for determining EBP, or efficiency bandwidth product. EBP is commonly used by beginning enclosure builders to determine sealed/ported preferances. However, I find EBP to be somewhat misleading when used literally for design constraints.
I never modeled it up to see the responce plots, nor did I run an EBP calculation, but the #s led me in that direction. I'll read the link this evening though.
By the way, thanks for the compliment. All the cabinet work, and crossover tweaks are done by me, but the drivers are all Adire