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General => Car audio => Topic started by: BiffaBacon on 30 December 2003, 22:32
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Eyup,
Not the most knowledgable on ICE, so take it easy. (Correct any mistakes as well)
I've got an Alpine CDA 7939R Head, JBL GTQ 360 Amp and a sub which I cant remember, fitted in my VR6.
I know the Amp only has four channels, 2 are being used for the front speakers, and the Sub. Overall the sound is crap.
What can I do to change it? I'm assuming I need another Amp somewhere for the other speakers and tweeters?
Much appreciated.
Biffa
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Has the amp got any gain or crossover controls?
If it does then i would set the fronts with a high end output (midrange and tweet) and the sub on a low end output (bass)
What is exactly wrong with the quality?
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unless your amp has 'tri-mode' you've got it setup wrong. I'd run the fronts off the headunit and the sub off the amp if you don't have it. You can pickup small amps to run the fronts now for ?50 or less.
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Has the amp got any gain or crossover controls?
If it does then i would set the fronts with a high end output (midrange and tweet) and the sub on a low end output (bass)
What is exactly wrong with the quality?
No idea if it has, I'll check a manual I downloaded.
In crap quality I meant only having sound coming out the front speakers and nowt out the back.
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unless your amp has 'tri-mode' you've got it setup wrong. I'd run the fronts off the headunit and the sub off the amp if you don't have it. You can pickup small amps to run the fronts now for ?50 or less.
Headunit doesn't have a pre-amp.
I thought that I would need another Amp, but dont have a clue about crossovers and sh!t like that.
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Here's a link for the Amp Manual ncase you's have any questions about it.
http://manuals.harman.com/JBL/CAR/Owner%27s%20Manual/GTQ360%20om.pdf
Thanks again for the help.
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I'd run the fronts off the headunit and the sub off the amp
I would agree with this, you either run as follows,
The stereo should have 4 channels so run each tweeter off 1 channel and each front speaker off 1 channel totalling all 4, then use the sub to run the sub. Or Split 1 stereo channel between the tweeter n front speeker on the left and the tweeter n front speaker on the right and then 1 channel for each rear speaker, and again use the amp for the sub.
The 40/50 watts the head unit puts out should be more than enough to power the stereo/tweeters. Do this and it should sound nice.
Any queries, just ask. :) Hope this helps
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I'd run the fronts off the headunit and the sub off the amp
I would agree with this, you either run as follows,
The stereo should have 4 channels so run each tweeter off 1 channel and each front speaker off 1 channel totalling all 4, then use the sub to run the sub. Or Split 1 stereo channel between the tweeter n front speeker on the left and the tweeter n front speaker on the right and then 1 channel for each rear speaker, and again use the amp for the sub.
The 40/50 watts the head unit puts out should be more than enough to power the stereo/tweeters. Do this and it should sound nice.
Any queries, just ask. :) Hope this helps
I cant confirm the channels as I cant find a bloody manual, and Alpine dont have it on their site. Car has 6 speakers though, 2 on the dash, 2 on front door and 2 in the back, then the 2 tweeters. If I go with your setup I'm still going to need another Amp for 2 of the front and the back speakers am I not?
Also the Head unit doesn't have a pre-amp so it cant power anything as far as I'm told?
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if you ran your tweeters straight off the heady you'd kill them! all that bass!
If you've got separate tweeters then you should have an Xover box with 6 terminals. Connect 2 to the heady, 2 to the mid and 2 to the tweeter. simple. then run your rear speakers off the rear channels on the headunit and the sub off the amp.
if your heady doesn't have ANY pre-outs what so ever then it's got to be really old cos most have atleast 1 these days. You'll have to sacrifice your rear speakers to run the amp if that's the case.
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Just ben told the Headunit has 6 RCA Pre outs, front, rear & sub. Does this help at all?
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if you ran your tweeters straight off the heady you'd kill them! all that bass!
Yes this is correct, I assumed he would know to go thru the x overs first ya see. Depends if the tweeters are standard or aftermarket etc. A x over is still required.
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All speakers & tweeters are standard, but will be getting uprated.
All I'm wanting is for all the speakers & tweeters to work, and to have the option of putting the sub in the boot if I want it.
Sorry if I come across as thick, but I really am on this subject.
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Split 1 stereo channel between the tweeter n front speeker on the left and the tweeter n front speaker on the right and then 1 channel for each rear speaker, and again use the amp for the sub.
I would personally go with this option and see how it sounds, If the tweeters n fronts dont sound very good then divide the 4 channels between the tweeters n front speakers so they get more power than splitting them. !!
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the mk3's standard tweaters have a small capacitor on them. I guess this is to cut out the lower freq's, but I don't know why they've got 4 wires going into them. I just mounted my alpine tweaters in the standard mk3 positions.
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From the sounds of it your heady doesn't have a preamp built in meaning you will need to run amps for all involved. I would run a 50x4 for the mids and highs. Run the tweeters and the door speakers in series with high pass filters on the + side of the tweeters. This should give the fronts a bit extra power handling but will also lower the impedence of the speakers. Run this amp off the front and rear RCA pre-outs on the heady. Then run a seperate amp off of the non fading pre-out for the sub. Sounds like the reason your current setup isn't doing it is that you don't have enough power for the sub and your rear speakers are not hooked up. 4 channel amps are made primarily for powering mids and highs. For solid base you need a dedicated mono or 2 channel amp bridged. Hope this will help. :) Going to bed now. Too much to party and the floor is moving. lol. Take it ez
Brad