Dr 280 compatible 12 inch speaker?
Dr 280 compatible 12 inch speaker?
Hey guys quick question. Is the Eminence Kappa 12a good enough to work in the DR280?? Does it's parameters fall within the 10% loophole?
Re: Dr 280 compatible 12 inch speaker?
Preferred driver T/S specs / Kappa12a
fs 35-55Hz / 45Hz
Qts .30-.50 / 0.27
Vas 60-120L / 112.1L
xmax no less than 4mm / 3.2mm
A rising response into the midrange is required.
https://www.eminence.com/pdf/Kappa_12A.pdf
The response chart for the Kappa 12a doesn't look like rising midrange to me, Qts is only a smidge out of spec but still out of spec, and the 3.2 Xmax is below the minimum.
Doesn't look like an option to me. But I'm sure Bill will verify one way or the other.
fs 35-55Hz / 45Hz
Qts .30-.50 / 0.27
Vas 60-120L / 112.1L
xmax no less than 4mm / 3.2mm
A rising response into the midrange is required.
https://www.eminence.com/pdf/Kappa_12A.pdf
The response chart for the Kappa 12a doesn't look like rising midrange to me, Qts is only a smidge out of spec but still out of spec, and the 3.2 Xmax is below the minimum.
Doesn't look like an option to me. But I'm sure Bill will verify one way or the other.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
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Re: Dr 280 compatible 12 inch speaker?
It may be used, but the short xmax makes it less than ideal.
Re: Dr 280 compatible 12 inch speaker?
Thanks for the quick response guys! Oh and Bill I got 2 of them for some time now and I am just edging to use them till I get a pair of the Deltas. Use as in mainly for testing at home. What voltage would be good enough?
PS:This is temporary I repeat TEMPORARY.
PS:This is temporary I repeat TEMPORARY.
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Re: Dr 280 compatible 12 inch speaker?
There's no minimum drive voltage.
Re: Dr 280 compatible 12 inch speaker?
Thanks for the info much appreciated.
Re: Dr 280 compatible 12 inch speaker?
Update: gonna try out 1 of the cabinets today, quick question Bill... Based on the mentioned t/s parameters what should be the max drive voltage on the Kappa 12a?
Re: Dr 280 compatible 12 inch speaker?
Awesome! Have fun and let us know how it turned out
It's rated for 450 Watts
To figure Volts from Watts, calc the square root of Watts times Ohms.
450 Watts x 8 Ohms = 3600
SqRt of 3600 = 60 Volts
My guess is it will be in distortion well before that point
It's rated for 450 Watts
To figure Volts from Watts, calc the square root of Watts times Ohms.
450 Watts x 8 Ohms = 3600
SqRt of 3600 = 60 Volts
My guess is it will be in distortion well before that point
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
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Re: Dr 280 compatible 12 inch speaker?
Bill's rule of thumb in past years has been to calculate based on half of the thermal wattage rating. In this case, that would make it around 40 volts. Of course, the caveat is that the high pass crossover point determines how much juice you can put to it.SethRocksYou wrote: ↑Fri Dec 27, 2019 11:20 am Awesome! Have fun and let us know how it turned out
It's rated for 450 Watts
To figure Volts from Watts, calc the square root of Watts times Ohms.
450 Watts x 8 Ohms = 3600
SqRt of 3600 = 60 Volts
My guess is it will be in distortion well before that point
If you are crossing at 100hz, I would think 40 volts would be very loud and safe.
6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210
"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."
Re: Dr 280 compatible 12 inch speaker?
Nice! I hadn't read that little morsel of information before. Thanks for passing it on Bruce Definitely makes sense for mids/highs.Bruce Weldy wrote: ↑Fri Dec 27, 2019 12:50 pm Bill's rule of thumb in past years has been to calculate based on half of the thermal wattage rating. In this case, that would make it around 40 volts. Of course, the caveat is that the high pass crossover point determines how much juice you can put to it.
If you are crossing at 100hz, I would think 40 volts would be very loud and safe.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Re: Dr 280 compatible 12 inch speaker?
Question,
If the Fs of a chosen driver is 54 (In Limits) Vas is 66 (in limits) Xmax of 6.5mm (exceeds min limitation), however the Qts is slightly below the .3 min at .23 with a high Bl of 24 and a Mms of 49 what will be the consequences in terms of performance of the low Qts? (Qes is .23 and Qms is 11.36)
(Would the slightly excess excursion act as a mitigating factor to the slighly low suspension?)
Thanks.
If the Fs of a chosen driver is 54 (In Limits) Vas is 66 (in limits) Xmax of 6.5mm (exceeds min limitation), however the Qts is slightly below the .3 min at .23 with a high Bl of 24 and a Mms of 49 what will be the consequences in terms of performance of the low Qts? (Qes is .23 and Qms is 11.36)
(Would the slightly excess excursion act as a mitigating factor to the slighly low suspension?)
Thanks.
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Re: Dr 280 compatible 12 inch speaker?
Low Qts results in a loss of low frequency response. There are many drivers that have the correct specs, so there's no reason to settle for a driver that doesn't.
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Re: Dr 280 compatible 12 inch speaker?
Hi guys. This is my profile/thread (or whatever ya call it) which for some reason I have no access to anymore. Is there any way I could regain access to it? Bill a little help over here! lol
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Re: Dr 280 compatible 12 inch speaker?
I don't understand.
Re: Dr 280 compatible 12 inch speaker?
If I understand correctly, tribal king and Starchild are one in the same. Guessing he lost the log in info for the Starchild account.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421
Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421