and now my speakers are BLASTING a very high pitched tone.

can't diagnose the problem at the moment because i'm at school. anyhow...earlier this morning, i dropped my little brother off at his school. i had some soft jazz playing on the FM radio on low volumes and right before he got out of the car, i heard a pop, followed by a VERY loud tone. it seems like i was playing a 800 hz tone VERY VERY loudly. the sound didn't decrease with volume, and can only be turned off when i turn off the HU. it scared the fawk out of both of us...

so i got on campus, and popped in a cd...still the same damn problem. i have no idea what can be causing it. i hope it isn't my 2100

any ideas?

 

Sounds like something fried in the amp.............. Disconnect the rca's to the amp see if it persists.

 

Pinched wire going into the door? Disconnect speaker leads then turn on the car again. Put each one back in one at a time.

BTW.. 800Hz is not a "very high pitched tone".

 

a pinched wire can cause this? all the wires are fed through the stock grommet on each door. but i'll give that a try tonight.

i'll disconnect the RCAs as well.

and no 800hz isn't really high .

 

im thinking something is pinched as well.. a speaker is shorted somewhere..

 

Yes very good possiblilty. If its grounding out somewhere it could be the culprit. Even if not in the door jamb, but in the door somewhere itself.

 

would one pinched wire cause both sides to be affected? it literally sounds like i played a test tone on full volume whenever the head unit is on.

 

Yes it would, your grounding the amp via the line. AC doesnt like DC ground.

 

Might be in the wiring running to the xovers.

 

i guess i'll start tracing the speaker wires from the amp to the front doors.

thanks for the help fellas.

 

Hopefully it's a easy fix.....

 

Just disconnect em from the amp first, then youll have one to trace rather than all..

 

can i take a DMM to the speaker wire at the amp's end and test for resistance? i mean if it's grounding somewhere it should give a goofy reading right?

 

You still need to disconnect em.

 

yeah, will do.

 

well, currently in my physics 2 class...bored to dealth...so i'm on my laptop...

Care to elaborate why AC doesn't like DC ground? Why would this kind of ground produce a high pitched tone?

 

did a quick check for resistance with my DMM at the crossovers. i got the following readings:

passenger side mid: 3.7
passenger side tweet: 1.6
driver side mid: 3.7
driver side tweet: 1.7

the mids seems fine, but the tweets are a little low no? aren't the cal25's 4 ohm nominal? now if there's a short somewhere, the readings would be way off. i would tear my doors apart, but i got a test tomorrow i gotta study for.

 

did you disconnect from the crossovers prior to checking?

 

no, do i need to?

i just stuck the two leads onto the screw heads on the crossovers. i figured the signal from the DMM will still go through the wire and back into the DMM again for a reading.

 

yes you need to.

 

alrighty, i'll give that a try.

i'm still used to seeing your user name in blue instead of that maroon color.

 

update:

finally had some free time on my hands after a hellish week of work and school. I removed each wire from the crossovers and retested them. i put one lead from the DMM to each wire, and grounded the other lead onto the chassis. No readings from any of the wires from the crossovers, so the wires are fine from the crossovers onward.

then to the trunk...i took out each speaker wire going to the crossovers and tested it for conductivity. i put one test lead on a wire, and the other lead onto the chassis for ground. i didn't get any readings from any of the wires, so i don't think there's a short on any of the wires from the amp to the crossovers.

so...with music playing i plugged each RCA back into the amp (i had them off so i can at least have some music via the rear fills)...and the moment i plugged the right channel RCA in, i heard the loud tone again. the left channel didn't make any noise, but i did hear some static. so me thinks it's the preouts on my HU that's causing this.

i'm thinking of just switching the front preouts to the rears.

 

And you have a Pioneer right?

 

yeah

didn't think the premier line would be troublesome...at least the 680-mp

 

Actually it was the Premier 860/960/880PRS and the standard 8600/9600. So I wouldnt have thought the 680 either, but it could happen. Have you check the RCAs for interuptions?

 

interuptions?

how would i go about checking for that?

 

same way you checked your speakers. OR even easier take a cheap set and run them straight from HU to amp.

 

**** is my amp!

i took another set of RCA i had laying around and directly connected the 2100 to the HU and the sound was there again. i switched to another preout and still same same sound!!!

 

Did you try grounding the rcas? When the pre-outs go on the pio's all of'em go.

 

but the sub preouts are fine. only the right channel input does the tone on the amp.

 

Only because you won't hear the buzz through such a low frequency. Do you have the ability to change the sub pre-out to a non-fade on that HU? Change it and then see if you get the buzz w/ it through the inside speakers.

 

just confirmed that my arc at fault

i connected my older fosgate amp, and everything works fine. guess i'll live with the germs getting 50 watts per side until i get the arc replaced. the arc isn't even a year old.

 

I had my germs with 50 per side before I got my new amp...sucks doesnt it?

 

find a guy who can fix amps, get it fixed.

 

yes it does suck. and even with 50 watts, i can already tell a dif between arc and the fosgate. ah gotta love quality sq amps.

 

i still have warranty on it.

i don't know any place in houston that does amp repairs. so i think i'll just ship it back to the man...

 

oh, then what're you worried about? sucks it happened, but glad you got it authorized huh?

 

Don

 

w00t at least you know there's nothing else wrong.......