install help needed / 6x9 100W RMS recomendations - Chevy Impala SS Forum
 
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post #1 of 9 (permalink) Old 05-20-2002, 06:43 AM
gbelli
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Ok, so I got the other amp wired up to the new 6" fronts. All I can say is it sounds amazing. The stage completly shifted to the front, and there is plenty of bass. Heck I need to adjust the gains back down! 100W @ 4ohms going to infinity perfect 6"s

My problem became that I'm using a 4 channel amp, 50w/channel to power my rears only. The problem was a horrible 'WHINE' when I tried it. It was wired to the rear RCAs, and output was to the rear speakers as they were wired before. So I looked at the book a little and it said to wire it from the fronts... Ok, so RCAs go to the front, and shift the speaker wires to the front channel. SAME outcome. It wasn't engine whine (more on that below). Then I actually read the book... It has the RCAs going to the front, and then bridged.... DOH. I dont really want to bridge them, thats 100W RMS and my speakers are only rated at 50W RMS. I have the gain at ~1/2 or so and faded toward the front now. It'll crackle above 16 or so on the Volume

My question is: Is there a configuration that I can use so I drive the amp with the rear RCAs, and only have one speaker output? Would it be as easy as getting 4ohm resistors and wiring them to the 'empty' speaker terminals so the amp thinks its powering a speaker? Or should I just upgrade to 100w speakers...

I'm also having a problem with engine noise. RPM dependant of course. I think I have it licked, but want to doublecheck. Everything was fine with the 2 sets of RCAs when they were wired to the single 4 channel amp. The problem started when I added the second amp. I think its because I am using two seperate ground points. Would 2 ground points cause engine noise?
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post #2 of 9 (permalink) Old 05-20-2002, 07:10 AM
catdaddy
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I think you may have your power and rca's running to close together(whining noise)I run mine on opposite sides of the car. and for your grounds, make sure there is no paint on the surface where you ground the wires and that they are snug making contact with the metal.
post #3 of 9 (permalink) Old 05-20-2002, 07:23 AM
gbelli
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<BLOCKQUOTE>quote:</font><HR>Originally posted by catdaddy:
I think you may have your power and rca's running to close together(whining noise)I run mine on opposite sides of the car. and for your grounds, make sure there is no paint on the surface where you ground the wires and that they are snug making contact with the metal.<HR></BLOCKQUOTE>

I'm using the same RCAs as before, run the same way. I wasn't having the problem when both the front and rear RCAs went to the 4 channel amp, only when I took the front RCAs and put them in the other amp. The 4 channel amp stayed in the same place, as did the RCA cable driving the rears that goes to it. I'm ONLY getting the whine from the rears. That being said, the only 'real' varriable is the other amp, and its ground potentially
 
post #4 of 9 (permalink) Old 05-20-2002, 07:31 AM
camel
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also use the same ground for both amps, every manual i have read always said that. ok so you just want your front speakers getting power? if you don't want your speakers to get too much power turn the gain right down to a point where they don't crackle. if your amp is bridged properly it won't even care if the other terminals aren't hooked up. you have 2 sets of rca's right? and 2 amps, but 1 is a 4 channel? at future shop or even radio shack they have rca splitters then your 1 rca cable will give signal to your 4 channel amp and the other rca will do your other amp. as for the whine, seperate your power wire and rcas and that should fix it, also use the same ground for both.
post #5 of 9 (permalink) Old 05-20-2002, 08:26 AM
gbelli
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Yea I'm gonna hook them up to the same ground. As for the amp not caring about two unused channels... For some reason it does *shrug* I have 3 sets of RCAs run from when I had the other amp in before powering the box so maybe I should just plug it in. The EQ has the sub preout shut off now so it wont get a signal. plug that in and turn it back to 4 cahnnel... now theres an idea [img]smile.gif[/img]
post #6 of 9 (permalink) Old 05-20-2002, 09:36 AM
camel
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so does your cd player have 3 rca pre outs? if you bridge an amp right it puts out more power. if your deck has 3 rca outputs, run 2 to the 4 chan, and 1 to the other amp. what exactly do you have for your stereo. that would help alot instead of all this guess work.
post #7 of 9 (permalink) Old 05-20-2002, 09:49 AM
gbelli
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I'm running an older (5 years) alpine deck. Its got front/rear RCAs. Those are fed into my Kenwood 11band EQ [img]smile.gif[/img] The EQ has 3 RCA outs. What I used to have was:
Front/rear going to RF400.4 to power front and rear speakers 4 [email protected] (50w/chan).
Sub out going to briged RF200.2 powering subs.

Now I have the front RCAs going to the 200.2 powering the new Infinity perfect 6"s Sounds great, 100%.

The rear RCAs are going into the front channel of the 400.4, its set for 2 channel, and I bridged it (per instructions)

I'm fairly certian that the whine is from the dual ground, but I'd love to only get 50W to those 6x9s. I know about the bridging, and thats why I want to avoid it. If I can just plug in the sub RCA to the rear, set it for 4 channel, and rewire the 6x9s to the front channel I'll be GOLDEN.
post #8 of 9 (permalink) Old 05-20-2002, 11:35 AM
LUCKY931
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hey greg, i dont know about the other stuff as far as rca's..i can say that the power issue you have w/ sending more power to the 6x9's is not an issue in mine.. i send twice the power rating to my 6x9's (infinity reference) and play them loud and never had a problem..the real thing that blows speakers are distortion and as long as you send a clear signal and power u would be fine sending that power to them...
post #9 of 9 (permalink) Old 05-20-2002, 11:54 AM
gbelli
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<BLOCKQUOTE>quote:</font><HR>Originally posted by BALLA IMPALA:
hey greg, i dont know about the other stuff as far as rca's..i can say that the power issue you have w/ sending more power to the 6x9's is not an issue in mine.. i send twice the power rating to my 6x9's (infinity reference) and play them loud and never had a problem..the real thing that blows speakers are distortion and as long as you send a clear signal and power u would be fine sending that power to them...<HR></BLOCKQUOTE>


Thats the same 'school of thought' I've been brought up on, and thats what supprised me. It cuts in and out, and its certainly volume based. FWIW I'm running Boston Acoustic RM9s

CORRECTION
Its an older (better) RF 400.4 thats rated at 200w X 2 at 4ohms at 13.8V.... BUT at 14.4V 2 channel into 4ohms is 260W
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