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Re: on Sale - $55/pr (drivers & XO)
You should read some of initial posts in this thread.
The deal is that these are underhung voice coils. The gap is huge. The Xmax might be +/- 4mm, but the Xlim (mechanical limit - where you hear the "pop" of the voice coil bottoming out) is +/- 10mm.
I've tuned the box to 40 Hz, and (unlike MOST small woofers) these guys push 40 Hz at full rated Pe with UNDER 4mm of throw (since that's the Fb), with the max excursion just over 7mm near 60 Hz (and again - climbing, in the mid 30's). When I put the parms for all these little ND woofers into WinISD, I use 6mm for Xmax (instead of 4), and then I let the excusion climb to 8mm for a worst case scenario. I think these can take almost all their rated power down into the 30's before you hear them bang. They can take a lot more abuse than the 6.5" and 8" Dayton Classics which "bang" quite readily in vented cabs.
Using WinISD and MY measured T/S parms, 10w takes these to 4mm at 70Hz.
At 6mm, they can take 20w down into the mid 30's, and 30w takes them to 8mm in the mid 30's. While I can't recommend these as replacements for an HT subwoofer, they DO play any notes of musical interest at moderate levels in your average livingroom. At Grinnell (IOWA DIY) they played in a 400 seat theater and really weren't too bad in there.
Chris
Originally posted by blue934
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The deal is that these are underhung voice coils. The gap is huge. The Xmax might be +/- 4mm, but the Xlim (mechanical limit - where you hear the "pop" of the voice coil bottoming out) is +/- 10mm.
I've tuned the box to 40 Hz, and (unlike MOST small woofers) these guys push 40 Hz at full rated Pe with UNDER 4mm of throw (since that's the Fb), with the max excursion just over 7mm near 60 Hz (and again - climbing, in the mid 30's). When I put the parms for all these little ND woofers into WinISD, I use 6mm for Xmax (instead of 4), and then I let the excusion climb to 8mm for a worst case scenario. I think these can take almost all their rated power down into the 30's before you hear them bang. They can take a lot more abuse than the 6.5" and 8" Dayton Classics which "bang" quite readily in vented cabs.
Using WinISD and MY measured T/S parms, 10w takes these to 4mm at 70Hz.
At 6mm, they can take 20w down into the mid 30's, and 30w takes them to 8mm in the mid 30's. While I can't recommend these as replacements for an HT subwoofer, they DO play any notes of musical interest at moderate levels in your average livingroom. At Grinnell (IOWA DIY) they played in a 400 seat theater and really weren't too bad in there.
Chris
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