Two 10"inch and two 12" inch subwoofers and what to do?? - diyAudio
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Old 23rd February 2008, 05:54 PM   #1
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Unhappy Two 10"inch and two 12" inch subwoofers and what to do??

I have two ten inch subwoofers and two ten inch subwoofers. I want to build two boxes for them. Would a box with a ten and a twelve sealed from each other. I want them to be as accurate as possible.
Thanks

Infinity Perfect 10.1
Size 10 -inch
Impedance 4 ohms
Cone Material Aluminum
Surround Material Butyl rubber
Sealed Box Volume (cubic feet) 0.6
Ported Box Volume (cubic feet) 1
Port diameter (inches) 3
Port length (inches) 10.4
Free-Air Yes
Dual Voice Coil No
Sensitivity 94dB
Frequency Response 18 - 0.2k Hz
RMS Power Range (Watts) 75-350
Peak Power Handling (Watts) 1400
Top Mount Depth (inches) 5 13/16
Bottom Mount Depth (inches) 6 1/2
Cutout Diameter or Length (inches) 9
Vas (liters) 32.13
Fs (Hz) 28.35
Qts 0.42
Xmax (millimeters) 14.15
Parts Warranty 3 Years
Labor Warranty 3 Years

10"
THIELE-SMALL PARAMETERS
VOICE COIL DC RESISTANCE: REVC (OHMS) . . . . . . 4.11
VOICE COIL INDUCTANCE @ 1 KHZ: LEVC (MH). . . . . . . . 2.96
DRIVER RADIATING AREA: SD (IN2) . . . . . . . . 53.40
SD (CM2). . . . . . . 346.00
MOTOR FORCE FACTOR: BL (TM) . . . . . . . . 16.64
COMPLIANCE VOLUME: VAS (FT3). . . . . . . . . 1.36
VAS (LITERS). . . . . . 32.13
SUSPENSION COMPLIANCE: CMS (M/N) . . . . 189.00
MOVING MASS, AIR LOAD: MMS (GRAMS) . . . . 166.71
MOVING MASS, DIAPHRAGM: MMD (GRAMS). . . . 163.01
FREE-AIR RESONANCE: FS (HZ) . . . . . . . . 28.35
MECHANICAL Q: QMS. . . . . . . . . . . . 8.83
ELECTRICAL Q: QES . . . . . . . . . . . . 0.44
TOTAL Q: QTS . . . . . . . . . . . . 0.42
MAGNETIC-GAP HEIGHT: HAG (IN) . . . . . . . . . 0.39
HAG (MM) . . . . . . . . 9.80
VOICE-COIL HEIGHT: HVC (IN) . . . . . . . . . 1.50
HVC (MM) . . . . . . . 38.10
MAXIMUM EXCURSION: XMAX (IN) . . . . . . . . 0.56
XMAX (MM). . . . . . . 14.15


Infinity Kappa Perfect 12.1 12" 4-ohm subwoofer
Size 12 -inch
Impedance 4 ohms
Cone Material Aluminum
Surround Material Butyl rubber
Sealed Box Volume (cubic feet) 1
Ported Box Volume (cubic feet) 1.75
Port diameter (inches) 4
Port length (inches) 12.33
Free-Air Yes
Dual Voice Coil No
Sensitivity 96dB
Frequency Response 18 - 0.2k Hz
RMS Power Range (Watts) 75-350
Peak Power Handling (Watts) 1400
Top Mount Depth (inches) 6 1/8
Bottom Mount Depth (inches) 6 7/8
Cutout Diameter or Length (inches) 10 15/16
Vas (liters) 83.28
Fs (Hz) 23.32
Qts 0.44
Xmax (millimeters) 14.15

12"
THIELE-SMALL PARAMETERS
VOICE COIL DC RESISTANCE: REVC (OHMS) . . . . . . 4.00
VOICE COIL INDUCTANCE @ 1 KHZ: LEVC (MH) . . . . . . . 3.05
DRIVER RADIATING AREA: SD (IN2) . . . . . . . . 81.94
SD (CM2) . . . . . . 531.00
MOTOR FORCE FACTOR: BL (TM) . . . . . . . . 16.90
COMPLIANCE VOLUME: VAS (FT3) . . . . . . . . 3.53
VAS (LITERS) . . . . . 99.97
SUSPENSION COMPLIANCE: CMS (M/N) . . . . 208.00
MOVING MASS, AIR LOAD: MMS (GRAMS). . . . 224.00
MOVING MASS, DIAPHRAGM: MMD (GRAMS) . . . 216.96
FREE-AIR RESONANCE: FS (HZ) . . . . . . . . 23.32
MECHANICAL Q: QMS . . . . . . . . . . 10.28
ELECTRICAL Q: QES . . . . . . . . . . . . 0.46
TOTAL Q: QTS . . . . . . . . . . . . 0.44
MAGNETIC-GAP HEIGHT: HAG (IN) . . . . . . . . . 0.39
HAG (MM) . . . . . . . . 9.80
VOICE-COIL HEIGHT: HVC (IN) . . . . . . . . . 1.50
HVC (MM) . . . . . . . 38.10
MAXIMUM EXCURSION: XMAX (IN) . . . . . . . . 0.56
XMAX (MM) . . . . . . 14.15
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Old 23rd February 2008, 05:58 PM   #2
Speakerholic
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Hi,

Please tell us your thoughts behind using two different woofers. This is a non-standard practice and it's something I would avoid. Two woofers covering the same frequencies will sound different and it will be very hard to achieve anything accurate because of that.
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Old 23rd February 2008, 06:15 PM   #3
tinitus is offline tinitus  Europe
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Old 24th February 2008, 05:50 AM   #4
judtoff is offline judtoff  Canada
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IMHO sell all 4 and then get something that is more suitable for your application(whatever it is).

Those are decent drivers, but finding one thats more application specific might be better. IIRC they are car audio subs anyways.

:P get some dayton titanics the HiVi 10" sub it looks potent.
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Old 26th February 2008, 11:53 PM   #5
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I was thinking two sealed enclosures. Two with tens and two with twelves. Used as subwoofers. Do you think this is a problem???
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Old 26th February 2008, 11:53 PM   #6
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Correction. Four sealed enclosures. A ten inch on top of a twelve inch enclosure on each side under my bookshelf speakers.
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Old 27th February 2008, 09:34 AM   #7
Thawach is offline Thawach  Thailand
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hi Gentle1Man


i cannot see the quality with your design. The spl may be high too much more than your bookshelf speaker. sometime you must adjust the volume's lower.


regards

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Old 27th February 2008, 10:27 AM   #8
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Location: Western Sydney
Here's a way different drivers have been combined before (by Thorsten, iirc):

http://www.fortunecity.com/rivendell...d/dddllqd.html

Your woofers are fairly similar in everything except Vas, so the 'compound driver' approach should work...
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Old 27th February 2008, 11:30 AM   #9
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What's the problem here? Try it and see if it works, put the drivers in series to make an easy load for the amp, the Qts is close enough as is resonance. Chip board is cheap enough, but use one volume. I have a vented quad box here I use for parties, uses different size woofers with similar resonant frequencies, it breaks all sorts of "RULES" but manages to sound loud and strong, with no nasty discordances.
try 2 X 15 plus 2 X 12 nominal ^ohms load to the amp in a 250 litre ported box. Impotant thing here it was an experiment that "worked"

regards Ted
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Old 27th February 2008, 11:34 AM   #10
Corax is offline Corax  Germany
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Hi Gentle1Man,

according to the TSPs they are all heavy coned car speakers which aren't really capable of reproducing anything above 200Hz IMHO though. I still wonder about the SPLs given in the tables you provided - 94dB for 10" and 96dB for 12"?! At what frequency are they measured. Do you have a frequency plot handy?
Car chassis do go deep down in frequency easily (sometimes even below 20Hz) but with the cost of sound pressure level. That's the reason why enthusiasts desperately need so many kilowatts in their cars to get the (car)body shaking.

My advice would be to use either the 10" or the 12" chassis depending on your desire to get a little more SPL below 30Hz (then use the 12" - diameter is all that matters for sound reproduction at low frequencies) or a smaller enclosure (then the 10" might be the better choice). Neither one has a really noticable advantage over the other one.

My favourite design for such subwoofers would be the following:
Use two chassis in a vented enclosure (preferably bass reflex - with the duct pointing to the floor for instance or on the others sides, or ...) which are mounted on opposing sides. Provide the "cube" with a plate mounted active subwoofer electronic (available in various (internet-)shops) and with various power ratings and amplifier topology. I like those class-D kinda things, because of their less weight and outstanding performance besides efficiency (no big heat sink).
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