Speaker port Question - Chevy Impala SS Forum
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post #1 of 29 (permalink) Old 05-14-2002, 10:39 PM
Jose
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Hey guys, it's me agian with another question, I just instaled my stereo suystem but it seems that it doesn't sound as is supposed to sound, I have 3 Alpine SWR-1221D 12" 2ohm subs with 3 amps, 1 amp for each sub, the port on the box is right through the rear deck but there is only 2 4" tubes coming in from the box, you think that the box needs to breath a little more? should I cut a bigger hole in the box and the rear deck? by the way the box is like a bandpass where the subs are inside the box and covered with a plexiglass, please comment on this one before I start cutting my rear deck, thanks

Here are some pics of the install

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post #2 of 29 (permalink) Old 05-15-2002, 12:54 AM
DEVIL.DOG
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Are the amps bridged or running each sub in stereo?

Also, if the amps are 4 ohms and the speakers power output is rated at 2 ohms, you wont realize the potential of the speakers since they will only receive loads of 4 ohms. Even if you run the amps bridged, they most likely bridge to 4 ohms. I think you may only be getting half the rated power of your amps at 4 ohms.

I wouldn't start cutting anything yet! You need to verify the power rating, output rating, and actually load the subs are being driven with.
post #3 of 29 (permalink) Old 05-15-2002, 08:34 AM
Jose
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The amps are mono amps 500watt RMS at 2 ohms, and the subs are 300watt RMS 1000 watt peak 2ohm+2ohm dual voice coils, the sub and the amps should be an OK combo,
 
post #4 of 29 (permalink) Old 05-15-2002, 08:46 AM
jelzey
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Also ports are for tuning the frequencies of the box and not for letting the box breathe so cutting the rear deck would be bad. Is this a custom box made by somebody or a store bought box that is supposed to handle those speakers?
post #5 of 29 (permalink) Old 05-15-2002, 10:50 AM
Jose
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I biult the box to fit the car my self, what I'm trying to say here is that the box only has 2 air outlets that are 4" diameter,
post #6 of 29 (permalink) Old 05-15-2002, 12:03 PM
jelzey
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OK, so you have a bandpass ported box. How did you know what size to make the ports? Did you use a computer or jsut kind of guess. Sorry just trying to figure out what ya did and help. If you just used those ports for the heck of it I would start to experiment with different port lenghts. Try a port that goes in the box a ways ans not flush with the outside and goign to up to the rear deck. Sounds like you tuned the box to a high frequency (like 90Hz) instead od a good 20-30HZ. I would make a two tubes that touch the box floor and reach up to the rear deck. Insert the tubes in the box (outside of car or pulled up to front of trunk). Start pulling the tubes up till the desired sound is found (a test cd would be great for this). Now the tubes will be to long. Push the tube bakc in the box about 1 inch (general rule) and then cut the top of the tubes to be even with the rear deck. You might even want to make 2-3inch tubes with a filler (since hole is 4") and try the same thing. My email is [email protected] if you want to talk about this offline.
post #7 of 29 (permalink) Old 05-15-2002, 12:24 PM
camel
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are your subs wired at 4 ohms or at 1 ohm? you just said your amps do 500wrms @ 2ohms but if your running dual 2 ohm subs, they can't be wired at 2 ohms. you would need dual 4 ohm, or dual 1 ohm subs. www.linearteam.dk and download winisd, its a speaker box design program. punch in your subs and your box size, and then your front size. then select bandbass, make sure u get the right order of bandpass box. then see if your mach port speed is in the green or red. it should be in the green, more the better. sounds like you didn't tune your box right, your subs are prolly getting 250 wrms so they should move alright. fill us in brotha
post #8 of 29 (permalink) Old 05-15-2002, 03:01 PM
Jose
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I'm in the process of remaking the ports on the box, I will let you know how it turns out later, by the way the link that you just posted does not work, can you please post it again
post #9 of 29 (permalink) Old 05-15-2002, 03:27 PM
Jose
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Never mind, i got the link to work, thanks
post #10 of 29 (permalink) Old 05-15-2002, 06:06 PM
camel
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i just fixed it. i wasn't thinking when i posted it. what are the interior demisions of your box for the front and back. i'll run the numbers and see what i can come up with just to help.
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