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Message Forums Car Stereo Message Forums > Subwoofers and Speakers > JBL "15?
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ZRad
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 JBL "15?

I have a 90zx w/ jvc head unit, I just somewhat installed a alpine v12 250W amp. I had an old kustom bass AMP/speakers set that I took one of the 15(8ohm) out. I haven't built a box yet. I just wanted to test it before I put too much money into it. The problem is that it dosn't seem to be able to 1 get very loud or hit hard. I would think that the amp should be plenty big enoungh to get a decent thump out of it. I have even tried to bridge it and still nothing. It dosn't seem any better than the 6X9s that are already in there. Will I have anything to look forward to? Please help

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New Post 02-02-2006 11:28 PM
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Donsway
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The 15 is a 8ohm speaker? If so the amp will only put out about half what it would at 4ohms. If you have two 15s 8ohms you can wire them in parallel to get a 4ohm load on the amp. This will make the amp put out more power.

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New Post 02-02-2006 11:57 PM
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ZRad
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I have another 15" 8ohm that I could use. So would it kick at all if I put the other one in there? I didn't think that the amp would run 2 15s

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New Post 02-03-2006 12:00 AM
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Donsway
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Are they in boxes? If not there will not be much bass.

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New Post 02-03-2006 12:07 AM
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ZRad
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They aren't in boxes YET. I wanted to see if it would be worth it first. So far it isn't. What about a 16 ohm 15"? How would that be?

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New Post 02-03-2006 12:11 AM
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Donsway
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The amp would put out about 75 watts. You will be going for 4ohm. Two 8ohms wired in parallel will be 4ohm. And a box will make the bass happen.

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New Post 02-03-2006 12:19 AM
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ZRad
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Then I guess I need to remove another speaker tonight. and try it tomorrow. WOW. 2 15s in a 300zx. I may have to look into plexyglass. Should I mount them in an isobaric formation to get the most boom for my buck? and how big of an enclosure should it be?

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New Post 02-03-2006 12:24 AM
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Donsway
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Easy king, baby steps.lol That will be a good car sound wise. Look at my gallery 1400watts on just one of the subs. Makes me so happy:)

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New Post 02-03-2006 12:31 AM
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Donsway
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Look up the subs on the net, see what size and type box they like.

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New Post 02-03-2006 12:34 AM
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ZRad
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I know, I know. Its late and I am having dillusions of grandure. SHould the enclosure be about 2½ cubic feet for an isobaric?

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New Post 02-03-2006 12:35 AM
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Donsway
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Just build a box that will fit you will be upgrading soon.haha

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New Post 02-03-2006 12:40 AM
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