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-   -   to port or not to port (http://www.diyaudio.com/forums/car-audio/105358-port-not-port.html)

nakkor 16th July 2007 07:11 PM

to port or not to port
 
i recently purchased a Cerwin-Vega 12" V-max sub. it is a dual 2 ohm speaker that can handle 600 rms..(not too shabby imho) it will be driven by a Cerwin-Vega EXL 1000D that puts out 500 rms...my friend let me put it in his ported box, in which it slammed, or should i keep the speaker in the sealed box that i build to CV air space specs even though it isn't as loud, and doesn't seem to be as responsive to my broad range of music taste....i know box type is generally personal preference, but any insight that yall could give me would be great..

Clipped 17th July 2007 04:22 AM

port it ! and adjust the port length to your musical taste.

BHTX 17th July 2007 06:42 AM

CV doesn't seem to give any T/S parameters for their drivers, which is pretty much a must-have IMO. Try calling them maybe? Although I wouldn't be surprised if they refused to give you any pertinent information. :rolleyes:

IMO, if you want the BEST sound from a subwoofer in a vehicle, large ported enclosures usually aren't necessary, mainly due to the massive cabin gain. In fact, the best setup I've ever heard was IB with the back seat removed, and other's opinions seem to confirm this.

Anyway, let us know how it works out when you need further help. But until you get some fairly accurate T/S specs to toy around with, any success with this project is just a shot in the dark.

CERWIN-VEGA!
Customer Service and Technical Support
Monday-Friday 8am-5pm MST
Phone: 1-480-838-9422
Fax: 1-480-491-1201

Shipping Address:
Attn: Customer Service Department
6965 S. Priest Drive
Suite 5
Tempe, AZ 85283

nakkor 17th July 2007 08:33 AM

t/s specs
 
this is the link to speaker specs.....they hide it well

http://www.cerwinvegamobile.com/manu...Sub_Manual.pdf[/URL

with those specs, any suggestions on whether or not it should be ported?

nakkor 17th July 2007 08:33 AM

btw it is in a 92 mazda extended cab p/u, if that makes a difference...

richie00boy 17th July 2007 09:16 AM

Qts is borderline at 0.46, I would tend to suggest a sealed box.

BHTX 17th July 2007 10:30 AM

Yep, I'd try sealed first with this one..
*edit* - But as far as the woofer itself goes, vented is just as doable.. Just thought I'd make that clear.

I kept trying to figure out why WinISD was giving me a crazy EBP of like 500-600, but soon realized that CV put a typo in their own PDF, lol. QES is .52, not .052!..which is impossible anyway. Afterwards, we get an EBP of 51.9. Anyhoo, for the given T/S, WinISD suggests a sealed enclosure of .717 ft^3 (20.3 l) for a .71 Q with an F3 of around 41 Hz, and -10dB at 24 Hz. If you ever get stuck on wanting to try ported afterwards, WinISD suggests a 1.507 ft^3 (42.7 l) enclosure at 23.61 Hz for flattest response with an F3 of about 22 Hz, and -10dB at 18 Hz. Group delay peaks at 32.83ms @ 21.26 Hz. Of course, this is all disregarding the 12 dB/octave cabin gain, which plays a very significant role in the final response of the system. And being an extended cab pick-up truck, the gain will even be slightly higher.

Hope this helps.

~ Brandin

richie00boy 17th July 2007 11:53 AM

The trouble is going to be physically incorporating a wide enough vent to tune a 43 litre box to 24 Hz. That is why I recomended sealed ;)

nakkor 17th July 2007 07:45 PM

thanx much....hopefully i get use to the sealed sound, and if it just isn't enough for me.......maybe i'll go up a model or 2 to the stroker or stroker pro....lol.....but thanx again...

BHTX 17th July 2007 09:15 PM

Quote:

Originally posted by nakkor
and if it just isn't enough for me.......maybe i'll go up a model or 2 to the stroker or stroker pro....lol.....
..I wouldn't suggest a Stroker. :xeye:


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