"BEST" Woofer 50Hz - 300Hz & Hi eff, maybe 15" ?? - Page 15 - diyAudio
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Old 23rd November 2011, 03:15 PM   #141
EBA is offline EBA  France
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Hi bear,

What are the S / T parameters of your ADIRE DPL 12 mount on your quadripole ?

Adire is done.

EBA
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Old 24th November 2011, 02:52 AM   #142
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T/S I have to guess, because it is so long ago now and I am not near my notes...

I think Qt is ~0.4 maybe a little less 0.38?
VAS was ~4cuft...
Fs maybe 22Hz??

I dunno, +/- some %...

The real specs are likely online somewhere...

The system gets some increase in sensitivity because the two cabs per channel are in parallel.
But I use a large SS amp (Crown MacroTech) with high DF... also these drivers are/were what I used as the second iteration, when those drivers were still new and fresh... keep in mind that I use them only BELOW ~65Hz... 4th order rolloff with the -3dB point at 65Hz.

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Old 24th November 2011, 05:47 AM   #143
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Quote:
Originally Posted by bear View Post
The real specs are likely online somewhere...
www.adireaudio.com/Files/OldAdireDrivers.pdf
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Old 24th November 2011, 12:11 PM   #144
EBA is offline EBA  France
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Thank's Bret,

Bear,

Your DPL12 have a very low eff = 84 db x two speakers = 87 db

We don't say " i do " with a Hight EFF bass speakers !!!

Best regards

EBA
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Old 24th November 2011, 03:51 PM   #145
freddi is offline freddi  United States
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Tom's generational record/playback test must be stringent as colorations which are bearable in listening pile up noticeably just in the first recording.


I tend to like lower mass woofers as toying around with 2-ways with higher crossover points, it seems a better tradeoff - could be my compromised hearing.

re: SC15 neodymium Peavey (TS same for 1508-8HE ferrite version other than 1K watt program)
- Znom (ohms) 8
- Revc (ohms) 5.32
- Sd (Square Meters) 0.084
- BL (T/M) 16.04
- Fo (Hz) 51.2
- Vas (liters) 182.4
- Cms (uM/N) 182.0
- Mms (gm) 52.90
- Qms 10.60
- Qes 0.352
- Qts 0.341
- Xmax (mm) 1.9
- Le (mH) 0.34
- SPL (1W 1m) 100.3
- No (%) 6.70%
- Vd (cu. in. / ml) 19.5 / 319
- Pmax (Watts pgm.) 1300
- Disp (cu. in. / ml) 197/ 3229
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Old 24th November 2011, 04:12 PM   #146
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This is what I'm planning on doing. It's a B&C 15BG100 in a 80liter box tuned to 32Hz. Sensitivity is a little above 90dB, and it's good to 30Hz with room gain.
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Old 24th November 2011, 06:49 PM   #147
KSTR is offline KSTR  Germany
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Quote:
Originally Posted by EBA View Post
But one parameter didn't mentionned.it's the FA factor ( Acceleration factor ) = BL/MMS . This parameter is the most important for the dynamics and the physical impact.
Please use BL^2/(Re*Mms) instead. Otherwise you DO NOT factor out the coil resistance and you DO favor drivers with high Re, which is not correct.
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Old 24th November 2011, 07:03 PM   #148
KSTR is offline KSTR  Germany
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Quote:
Originally Posted by Overkill Audio View Post
PD1550
I had those in OB and wasn't amused (), they bottom out so easily. The quality for the price is very OK, though.

The Beyma P80's have twice the Xdamage, in comparison.
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Old 24th November 2011, 07:34 PM   #149
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Talking Over drive a PD1550...RESPECT DUDE!!

Hi KSTR,

Wow, you managed to over drive the PD 1550 to the point where it bottomed out...that must have been loud...! Its AES rated to 600 watts continuous with a genuine sensitivity of 99 dB/1 watt at 1 meter so thatís a clean 125dB with 512 watts...still well under max power...And you did this in a domestic setting...how big is your lounge?!!

I never even approached the limits of my Beyma 15 SM115K and they have a lower sensitivity and a lower power handling.
Subjectively the PD's are much cleaner and lower distortion giving better impact on drums and better detail and texture on acoustic bass.

What 15 inch drivers have you used in open baffle that outperform the PD 1550's?
Thanks in advance and all the best

Derek.
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Old 24th November 2011, 08:10 PM   #150
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Quote:
Originally Posted by KSTR View Post
Please use BL^2/(Re*Mms) instead. Otherwise you DO NOT factor out the coil resistance and you DO favor drivers with high Re, which is not correct.
Which is basically sensitivity/efficiency...
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