is my ported box a dud, pic

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coppellstereo

Silver - Posts: 785

Joined: November 21, 2005

Location: United States

Posted: June 06, 2006 at 6:46 PM / IP Logged

what subs are those?

maybe they arent made to go into a ported enclosure and are having trouble with the lack of internal box pressure.

We can determine the right length of the port once we know the sub specs.

bassrider20hz

Member - Posts: 40

Joined: December 16, 2004

Location: United States

Posted: June 06, 2006 at 7:14 PM / IP Logged

well i decided to take a real close look at it by using the box making program winisd. if you think the parameters might help here they are

fo(hz)=27 Qms=3.16 Qes=0.43 Qts=0.38 Vas(liters)=44 EBP=57 Xmax=26mm

aznboi3644

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Joined: May 01, 2006

Location: United States

Posted: June 06, 2006 at 9:17 PM / IP Logged

well what is your boxed tuned to?

fakepete

Copper - Posts: 99

Joined: April 21, 2002

Location: United States

Posted: June 06, 2006 at 9:43 PM / IP Logged

Going by the port dimentions given (11.5 x 1.5 x 9 deep) and guessing the volume at one cube, WinISD says the tuning freq is 60Hz. The curve rolls off pretty hard after that, with a -3db at about 47Hz. That would explain the poor low bass response. I don't know how much you'll be able to improve the box without totally rebuilding it.

I was assuming there is an internal divider in the box, correct?

luckydevil

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Joined: July 04, 2005

Location: United States

Posted: June 06, 2006 at 10:19 PM / IP Logged

bassrider- Can you give us the external measurements of the box?

aceracer24

Copper - Posts: 140

Joined: May 30, 2006

Location: United States

Posted: June 06, 2006 at 10:42 PM / IP Logged

Correct me if I am wrong but considering you went from sealed (typically harder hitting) to a ported( not as hard on solid drum but goes much lower with usually higher SPL) wouldn't you need to adjust the amp to account for the new box? Also, a ported box requires less power to push the subs because of less resistance right? I could be talking out my butt but sounds like the EQ and amp have not been fully tuned for the new box.

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DYohn

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Joined: April 22, 2003

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Posted: June 06, 2006 at 11:18 PM / IP Logged

Did you try what Forbidden suggested several posts ago?

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bassrider20hz

Member - Posts: 40

Joined: December 16, 2004

Location: United States

Posted: June 06, 2006 at 11:47 PM / IP Logged

yes i did try forbiden's suggestion. thats what i thought at first but that wasnt it. I have been looking into this a lot and i think that fakepete might be on the right track. one of my theory's is my ported box a dud, pic - Page 2 -- posted image. is that the shop made me a box specifically for spl and not music listening something like that.

anyway heres the box dimensions<a rel="nofollow" href=" http://photobucket.com" target="_blank"><img src=" https://i81.photobucket.com/albums/j205/kuntakinteylok/untitled.jpg" alt="Photobucket - Video and Image Hosting"></a>

aznboi3644

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Posted: June 06, 2006 at 11:53 PM / IP Logged

Well call and ask them how they built the box and what they did in the design.

bassrider20hz

Member - Posts: 40

Joined: December 16, 2004

Location: United States

Posted: June 11, 2006 at 11:36 PM / IP Logged

well i went back to the shop that built my boxand they told me that the box wax actually built for spl competitons for burps and test tones and they told me that they didnt recomend for it for plating music because they can hurt my woofers. but i told them that i didnt want it because i wasnt satisfied and they gave me something i didnt want and they were cool and offered me some free neons for my footwells and they also gave me a eazy fix for my box they but me some custom pieces of MDF so that i stuck it in the ports and change the tunning freq and it did now i am happy im amazed. MAN my system KICKS ass. i didnt know that i can get that much outta these woofers now i can actually set alarms off COOL.

Thanks to all youguys that put into the subject seeya.

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