I have edited post (link 33) for the port volume to read 0.71 cu ft instead of 2.8. I have also estimated roughly 1.5 cu ft for driver and bracing displacement. That still makes around an estimated 6 cu ft volume all inclusive.
Param. 10D2 10D4 12D2 12D4 15D2 15D4
Fs 29 Hz 31 Hz 26 Hz 25 Hz 23 Hz 24 Hz
Qms 6.8 6.5 7.7 7.4 8.5 8.2
Qes 0.40 0.47 0.45 0.54 0.49 0.59
Qts 0.38 0.44 0.43 0.50 0.47 0.56
Vas 22.7 L 22.7 L 52.7 L 52.7 L 152 L 152 L
Re 2x1.6 Ohm 2x3.3 Ohm 2x1.6 Ohm 2x3.3 Ohm 2x1.6 Ohm 2x3.3 Ohm
Le 2x0.22 mH 2x0.34 mH 2x0.22 mH 2x0.34 mH 2x0.22 mH 2x0.34 mH
Sd 286 cm2 286 cm2 436 cm2 436 cm2 740 cm2 740 cm2
BL 15.2 N/A 19.0 N/A 15.2 N/A 19.0 N/A 15.2 N/A 19.0 N/A
Xmax 28.5mm one way linear
Pmax4 600W RMS (actual will depend on your application)
SPL 83.2 dB @ 1W, 1m 83.3 dB @ 1W, 1m 84.8 dB @ 1W, 1m 84.6 dB @ 1W, 1m 87.8 dB @ 1W, 1m 87.4 dB @ 1W, 1m
MSRP $389 $389 $419 $419 $449 $449
Ported Box 0.5-1.0 cu ft @ 20-35Hz. 0.6-1.3 cu ft @ 20-35Hz. 0.75-3.0 cu ft @ 18-32Hz. 1.0-3.0 cu ft @ 18-30Hz. 3.0-8.0 cu ft @ 16-30Hz. 3.5-9.0 cu ft @ 15-30Hz.
Sealed Box 0.25-0.5 cu ft 0.3-0.6 cu ft 0.5-1.5 cu ft 0.6-1.8 cu ft 1.5-4.0 cu ft 1.5-4.0 cu ft
The Brahma 15 is no longer available. The specs listed above are from second generation Brahma's that were never released. First generation Brahma 15 had a Vas of 99 liters abd a Fs of 26.
i might be able to still get one from a buddy, but used. Also it would be in the same 4ft3 enclosure. one thing that puzzles me is the rms though. I have read 1600 rms and i have also see 600 watts rms? i cannot figure oput which it is.
The original Brahma 15 could handle 1600 watts. You mention a 4ft3 enclosure, is that net volume after deductions for the sub or 4ft3 before any deductions made?
Green is a SPL graph of what the the Brahma will do in 3.7 cubic feet sealed. Porting is not an option due to air speed and port length issues. Passive radiators would be your only solution for this sub in this size enclosure. Pink is what thie sub really needs. 9 cubic feet tuned to 15 hz. You can see the result of using this sub in a small sealed box.
I assumed you have a total of 4 cubic feet internal volume. Subtracting displacement of the sub and bracing would give a net volume of about 3.7 cubic feet. For the graph I posted, cone excursion is reached at 15 hz with 1200 watts applied. I'm not sure how much power Blaser appplied to the SDX-15.
I think I used 1000 W as per Ty's very first post.
Hi Ty,
Yes you're correct. The sealed models are pretty similar. If you still need 3 or 4 cu ft enclosure, forget about a ported option. Too many issues will be revealed by porting such a small enclosure as Mike has indicated just above.
Stick with sealed or PRs. If you do otherwise you may be not be happy with the end result.
That sounds perfect or am i better off with a tc 2000 12" ported versus a 15" sealed in the same enclosure?
Ported 2.6 ft3 22Hz 12.5 in2 19 in
Passive 2.6 ft3 10Hz-25Hz Dual 12" PR Variable
i have access to a tc2000 12", a tc9 special without the aluminuim cone for more efficiency and also the special tc that i pasted the parameter sheet on. i also have access to a used brahma 15" but the rms is so unclear as to weather it is 600 or 1600rms. this tc9 special kind of intrigues me based on the fs but not sure if it would keep up with the other drivers listed.
never mind. forget about the special tc9 parameters listed above. would i still be better off porting a 12" version of the tc2000 or the tc9 in a 3-4ft3 or would it keep up with the 15"?
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