I have a single 12" sub that only has a recommended sealed box specs at 27L. But I'm curious as to what makes a speaker sutible for a ported enclosures, and what would work well in my case in wanting good low freqency extension with high SPL capability.
All the specs I can find are listed below:
RE 2x 3.2
QMS 9.09
QES .39
QTS .37
FS 33.5
VAS 60.5L
CMS .16mm/N
sens 86db
Xmax 8.99mm
WinISD gave me a ported Enclosure of 45.5L with a 4" dia port, 12.6" long tuned to 36Hz.
All the specs I can find are listed below:
RE 2x 3.2
QMS 9.09
QES .39
QTS .37
FS 33.5
VAS 60.5L
CMS .16mm/N
sens 86db
Xmax 8.99mm
WinISD gave me a ported Enclosure of 45.5L with a 4" dia port, 12.6" long tuned to 36Hz.
Thanks Tim!
You know I used to live in Seattle during the .com days. Boy I sure miss the great north west. I was just there recently to see some friends and stop by in Whistler and Vancouver for some shoippingand snowboarding, and boy do I miss the cool, crisp, clean air. I don't have that in San Diego.
You know I used to live in Seattle during the .com days. Boy I sure miss the great north west. I was just there recently to see some friends and stop by in Whistler and Vancouver for some shoippingand snowboarding, and boy do I miss the cool, crisp, clean air. I don't have that in San Diego.
Reflexing is not a problem. In fact the lowish Vas (so not ultra low Fs) makes it ideal for
reflexing, as subsonic power handling will be far better than a driver with much higher Vas.
Power handling will go down over sealed, but maximum SPL will
increase considerably in the low bass, equivalent to 4 12" sealed,
and it will take less juice to get there, high power handling only
by the fact there is no low bass to speak of is pointless.
sreten.
reflexing, as subsonic power handling will be far better than a driver with much higher Vas.
Power handling will go down over sealed, but maximum SPL will
increase considerably in the low bass, equivalent to 4 12" sealed,
and it will take less juice to get there, high power handling only
by the fact there is no low bass to speak of is pointless.
sreten.Attachments
I was curious as to why 27 litres sealed is recommended and
then I noticed the Re is quoted as 2 x 3.2R, 4 ohm per coil.
Hmmm......
A dual voice subs parameters are usually given with the coils
in parallel. Fine for a passive sub with each coil driven by each
channel of a 4 ohm capable amplifier, but 2 ohm is not a good
load for the huge majority of plate subwoofer amplifiers.
Is 27 litres sealed for the coils in series parameters ?
sreten.
then I noticed the Re is quoted as 2 x 3.2R, 4 ohm per coil.
Hmmm......
A dual voice subs parameters are usually given with the coils
in parallel. Fine for a passive sub with each coil driven by each
channel of a 4 ohm capable amplifier, but 2 ohm is not a good
load for the huge majority of plate subwoofer amplifiers.
Is 27 litres sealed for the coils in series parameters ?
sreten.I'm sorry. This is a car woofer that is from MB Quart. It's a dual voicecoil 12" sub rated at 4 ohm per coil. Model DWE304 I think.
I have this sub and a Dayton 10" MKII sub as well. MB Quart only recommends a sealed enclosure of 27L, and never mentions a ported enclosure.
I'm kind of curious based on recommended enclosures and predicted graphs which would be better and where. I figure I'll put the Dayton in my home in a recommended enclosure based on Parts Express's designs, probably using a sonotube. And the MB Quart maybe better suited in my car it seems.
I have this sub and a Dayton 10" MKII sub as well. MB Quart only recommends a sealed enclosure of 27L, and never mentions a ported enclosure.
I'm kind of curious based on recommended enclosures and predicted graphs which would be better and where. I figure I'll put the Dayton in my home in a recommended enclosure based on Parts Express's designs, probably using a sonotube. And the MB Quart maybe better suited in my car it seems.
Well you do get 2 ohm rated car amplifiers, but not home sub
plate amplifiers. You can always use a stereo 4 ohm amp to
drive each voice coil (paralled inputs) for in car use.
For in car use its quite simple - nearly every 12" sub is designed
for a ~ 1 cuft sealed box and it would be fine in this application.
For in-car use box volume is a major issue. Sealed with a amplifier
with a bass boost feature is probably better in car, though the
blue line with a flat amplifier probably would be a good choice.
sreten.
plate amplifiers. You can always use a stereo 4 ohm amp to
drive each voice coil (paralled inputs) for in car use.
For in car use its quite simple - nearly every 12" sub is designed
for a ~ 1 cuft sealed box and it would be fine in this application.
For in-car use box volume is a major issue. Sealed with a amplifier
with a bass boost feature is probably better in car, though the
blue line with a flat amplifier probably would be a good choice.
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