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Old 26th September 2014, 01:50 PM   #1
Ajkub is offline Ajkub  United States
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Location: ND
Default Need help tuning

I have four Infinity 1262w subs. There will be two in each cabinet in parallel. The cabinets volume is 3.7 ft3. I'm using two 3" ports because I feel they will reproduce tighter sound verses 4" ports. I need some one to plot them for tuning frequency for lowest and tightest responce.
Revc 7.2
Levc 1.1
SD 82.3 ft2/531 M2
Bl 10.8
VAS 2.83 ft3/80.14 L
CMS 199
MMS 203 g
MMD 196 g
FS 25
QMS 6.84
QES .49
QTS .46
HAG .314 in/8 mm
HVC 1.34 in/34 mm
XMax .512 in/13 mm

I know this seems lazy but, all I have for internet is iphone.
Thank you for any help
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Old 26th September 2014, 05:09 PM   #2
tb46 is offline tb46  United States
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Hi Ajkub,

Assuming that you have a free internal volume of 3.7ft2 [104.77L] go w/ a sealed box for 2ea. Infinity 1262W.

The box is not big enough, and 2ea. 3" ducts do not have sufficient cross-section.

For tightest response go sealed.

Regards,
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Old 26th September 2014, 08:08 PM   #3
Ajkub is offline Ajkub  United States
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Venting buys me around another 3 db. As I'm seeing it, the sensitivity of the woofers is 90 db 1 watt/ 1m. Two subs sharing the inclosure bumps it up to 96 db. I want tuned as low as possible for home theater sound without using a ton of power. So, how low can they go?
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Old 26th September 2014, 08:49 PM   #4
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The T/S specs listed are not usable. Cms could be .199, the Sd is unlikely 82f^2. you may want to have the driver tested to see what the actual T/S specs are.

Without accruate specs you cannot model a proper ported box. I would put two of them in a 2.5cf sealed box and use EQ.

Last edited by revboden; 26th September 2014 at 08:53 PM.
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Old 26th September 2014, 09:12 PM   #5
tb46 is offline tb46  United States
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Hi Ajkub,

I'll attach a Hornresp simulation for a single 1262W in a 3.7ft^3 vented box @ ~Xmax. The port particle velocity is already too high. Anyway, I recommend you stay w/ sealed for two drivers in this size box.

Regards,
Attached Images
File Type: jpg Single_1262W_vented_Input.jpg (26.6 KB, 85 views)
File Type: jpg Single_1262W_vented_SPL.jpg (20.9 KB, 83 views)
File Type: jpg Single_1262W_vented_Velocity_Port_out.jpg (18.5 KB, 84 views)
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Old 26th September 2014, 10:57 PM   #6
Ajkub is offline Ajkub  United States
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Eq is out of the question. My ports are firing to the rear, so I'm not worried by port noise. But, if I went with two four inch ports would it be better? Since cabin gain isn't a factor I'd just as soon tune them at 23 Hz or lower. The response plot above doesn't look bad. What was the tuning frequency?
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Old 27th September 2014, 01:50 AM   #7
tb46 is offline tb46  United States
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Hi,

Here is the tuning for the single 1262W vented enclosure. Hornresp is really easy to use for simple vented alignments, so is WinISD.

Regards,
Attached Images
File Type: jpg Single_1262W_vented_SPL_direct radiator.jpg (21.2 KB, 75 views)
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Old 27th September 2014, 01:19 PM   #8
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Quote:
Originally Posted by Ajkub View Post
Eq is out of the question.
I find it strange nobody's mentioning the full design of the speaker, just details. Tuning and size of ports. Obvious the driver is best with sealed but not bad with reflex enclosure but length of tube/ports.
3.7ft³ = 104.8L (each enclosure/2x drivers)
12" INFINITY 1262W, for each driver: 1.85ft³ = 52.4L*
*less the space for ports and drivers
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Last edited by Inductor; 27th September 2014 at 01:27 PM. Reason: enclosure net
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Old 28th September 2014, 01:44 PM   #9
Ajkub is offline Ajkub  United States
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The cabinets are well built MTX AAL 212 speakers. They are low buck speakers. From the factory they are loud 38 - 22K Hz but, sound horrid. So, for home theater, I bought four subwoofers, two 6.5 fiberglass mid-bass w/ phase plugs and two 8" planar tweeters. Crossover points are 250/ 5000 respectively. I've got around $800 into drivers and DIY crossovers, all purchase at wholesale. This will improve the sound drastically, though not to audiophile standards. But, plenty good for front channel of my home theater system.
My surrounds are all Cambridge Soundworks that get 80 watts RMS each. Front channel right & left get 160 RMS @ 4 ohm. No need for a separate sub with these large floor standing front speakers.
So, I've got plenty headroom for BD play back. I just want to tune these cabinets as low as possible.
Also, I may be looking into finding a used 4 ohm stable integrated 2 X 200+ amp to drive my home brewed floor standing cabinets. But, that's something for another forum.
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Old 28th September 2014, 03:23 PM   #10
tb46 is offline tb46  United States
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Hi Ajkub,

Can you provide the outside dimensions of the target enclosures, and would you consider adding the duct as a shelf duct below the box?

Regards,
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