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Old 04-06-2003, 10:34 PM   #1 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

well everybody, it finally hit me that i don't need 2 competition 12 inch subwoofers in my 73 mach 1 that weight 20lbs each and with the box it weights roughly 90lbs. (sure it did slow me down). so i took out those subs and i hooked up the door speakers and the rear speakers to the same amp i had pushing the subs. (kenwood 600watt 100watts x 2) all the speakers are 40rms watts so it's a perfect size amp to push all 4 speakers.

when i was done and i turned on the music. i couldn't believe my ears, the sound was so clear. it was LOUD and CLEAR to be exact. i asked myself why i didn't just do this from the beginning. i also have 2 speakers in the dash board. with 2 speakers in the dash, 2 in the doors, 2 in the rear, it makes the car sound awesome.

but then, i wanted to take it out driving to listen to the radio i heard a buzzing sound. that buzzing sound is coming from all 4 speakers connected to the amp. i made sure it was the speakers by putting my head right next to all 4 speakers. i turn down the volume to "0" and the same buzzing sound stays there. the buzzing sound DOESN'T change volume though. at 0 volume you hear it the most, but at 1/2 volume you don't hear it anymore. anything above 0 and below 1/2, the buzzing sound goes down. it's only because the music volume is louder so it cancels out the buzzing sound. but you can still hear it at the same volume at voume 15.

however if you turn off the car, the buzzing sound goes away. start the car right back up, the buzzing comes back. turn off the car, the buzzing goes away.

i then looked at the amplifier. there is a switch that says "stereo or mono", knowing it's for 4 speakers i put it to "stereo", and there is a filter switch, saying "off or lpf". low freq, means bass as in short. i put it on "off" because i do not want the speakers on the low freq. side. if you do all you hear is bass out of the speakers. if you put it on "off" you hear the buzzing sound. if you switch it to "lpf", the buzzing stops.

what in the hell can cause this? i hear it could be the condensor in the dizzy can do it, or spark plug wires. but it never did this to my subs when i had them hooked up. what else can cause radio interference. if it's something under my hood. it's funny because it didn't do it when i used my amp to 2 subs.

though i ALWAYS used this amp for subs. i haven't ever used them for speakers. people told me this specific amp is PERFECT for speakers and not for subs. thats what made me (part of ) hook the speakers up to the amp.


PLEASE HELP!!!
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Old 04-06-2003, 10:40 PM   #2 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

oh yea, the buzzing sound only goes on when the car is running. but if you hit the filter switch to "lpd" a.k.a. low freq., the buzzing sound goes off. but the speakers only produce bass. (not wanted)
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Old 04-06-2003, 10:55 PM   #3 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

Sounds like you have alternator whine. What you need is a noise supressor. If you want one really quickly, but kinda expensive, go to Radio Shack. They have them I believe. It's cheaper to go to a sound store such as Rolling Sound or the like. There are two different kinds of noise supressors. One hooks to the power feed on the amp, and is limited to a certain number of amps through it. The other is called a ground loop isolator and it hooks to the RCA cables going to the amp. It sometimes takes both to kill the whine completely. For an amp that size, I would recommend at least a 30 amp noise supressor if that is the kind you want. The ground loop isolator is cheaper, but tends to not work as well.
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Old 04-06-2003, 11:04 PM   #4 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

thing is what exactly is making the noise? why can i do if it really is my alternator whining?

do you really think a sound sur. something will work? if it will i will go out and buy it. but why is it making this noise all of a sudden?

OH YEA, I FORGOT TO IMPUT THAT I DID ONCE ACCIDENT FORGOT TO PUT BACK THE AMP POWER WIRE ON THE BRACKET SO IT TOUCHED THE HEDDERS FOR ABOUT 2 DAYS AND IT BURNED THE PLASTIC OFF OF THE WIRE. SO THER EIS A 2 INCH LONG BURN ON THE WIRE. SO I TAPED IT UP AND MOVED IT OUT OF THE WAY.

could this cause this?


also, could you explain more what a sound supressor is?

[ This Message was edited by: xoliex on 4/7/03 10:06am ]
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Old 04-06-2003, 11:16 PM   #5 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

I am no expert but it just sounds like you are getting feed back from the electrical workings of the car thru your stereo.

Are you running a high energy ignition system?

Another source of info would be your local stereo store or outlet, they might be able to answer your questions.
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Old 04-06-2003, 11:21 PM   #6 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

yes, i am running a MSD 6A BOX. though still using duraspark wirs and dizzy.

another thing guys, I'M ON MY ORIGINAL ALTERNATOR STILL, AND IT'S NOT CHARGING OVER 13.0 VOLTS.
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Old 04-06-2003, 11:25 PM   #7 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

Nastystang is right ignition is a major culprit and there is devices available for isolating that the other is extra grounds right to the frame make sure the motor is grounded clean all areas where the ground is attached I really dont like using the suppressors but they do work and for is notorious for engine noise but I would really spend some time with at least 8 guage wire grounding it at the amp, head unit, engine etc. good luck

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Old 04-06-2003, 11:28 PM   #8 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

i am using good size wires. i am using 1 guage battery cables and i'm using 4 guage power and ground wires on the amp.
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Old 04-06-2003, 11:40 PM   #9 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

Wow, and I thought the last few years of playing with car audio were useless.

Alright, what you have is normal. All of my speakers have a very light buzz with my amp.
I am running two 7x10's, two 6x9's, and a component set up front. This is all connected to my amp-a Zapco 360. It is loud and clear. But here is the deal, at idle, when the speakers "power up" you cant tell with a stock system, but when amped they make a slight buzz, its the constant power running to the speakers. The reason why its like this is because the speakers need a constant ampount of power to eliminate a "voltage spike" which can occur. Dont worry about the buzz, it wont hurt anything at all.

Oh yeah, I built two sub boxes and have one behind each seat. All I have to do is disconnect the wires and pull them out before I race
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Old 04-06-2003, 11:44 PM   #10 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

i know what kind of light buzz you are talking about. but this is not a normal buzz. this buzz is at least 1/3 full volume noise. it's a decently loud buzz. to complete cancel out the noise you have to put it to 1/2 volume, even then you could still hear it a little bit.

the noise is hurting my head.
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Old 04-06-2003, 11:50 PM   #11 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

MSD sells radio noise surpressors. When I installed my MSD, I had the buzzing noise in place of the music from my radio. Put one on, MSD #8830, no more buzzing. Might try it.
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Old 04-06-2003, 11:52 PM   #12 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

can the msd box ignition really be causing radio interference? i wonder why it didn't cause any when i had my amp hooked up to 2 12 inch subs.
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Old 04-07-2003, 12:22 AM   #13 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

The remote power wire "primary wire" for your amp "on" switch is probibly coming from a bad source. Also you will need to use resistor type spark plugs if you don't have them already and GROUND the heads to the chassie next to the battery ground.

Try pulling the "on switch" power from different locations in the fuse box or better yet... directly from the "amp on" wire coming from your head unit if it has one.

No amount of engine noise should be coming from any speakers on any car! period!

Apply this to your crossover if your running one also.

[ This Message was edited by: SCOTT on 4/7/03 11:23am ]
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Old 04-07-2003, 01:24 AM   #14 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

Quote:
On 2003-04-06 22:52, XolieX wrote:
can the msd box ignition really be causing radio interference? i wonder why it didn't cause any when i had my amp hooked up to 2 12 inch subs.
Sub frequencies don't go high enough for most noise interference. An alternator noise is a whine that winds up and down with rpms. Plug noise is a definate popping noise that speeds up with rpms. Ignition noise is less whiney and more like static. If you can figure out where it's coming from, you will have better luck filtering it out from the source.
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Old 04-07-2003, 01:32 AM   #15 (permalink)
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why is the amp making the speakers making a buzzing sound ONLY when car is ON?

actually, the noise stays at one volume. it doesn't go up or down with the speed of the engine. it has a constant noise level.
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