1200W+ AMPS SENDING DC TO SPEAKERS, I need help Options

[Kamakaze]

Ive done a few installs and Ive seen this problem about 4 times, where the amplifer sends out DC to the subs and ends up burnin out the sub. Ive tried alll i can think of but heres my history.


1st It was a KICKER 650 amp with Kicker L7 subs
-----changed the amp out to a Swiss Audio AmP, this was a much bigger amp and it sent even more DC voltage.
-----then changed a Pioneer4800 headunit to the pioneer N3 (that didnt solve anything
Then I decided to change out the subs (since those got burnt out) and added two L7's) still a problem so i left that project alone before i blew those too.

Next car had the same KICKER 650 amp with an L5 sub
------the subs got burned out so i changed the amp to a Kenwood 1800W that kenwood jus wasnt working period, took it backk and got another one and this one is now sending DC

if anyone has a solution please let me know ASAP.

[afroman]

i know this sounds stupid but have you tried diffferent RCAs. a bad RCA can make weird things happen.make sure bass boost is all the way down, gains are all the way down. low pass is on and such. start from scrathc and work from there.
-Aaron-

[Kamakaze]

i know this sounds stupid but have you tried diffferent RCAs. a bad RCA can make weird things happen.make sure bass boost is all the way down, gains are all the way down. low pass is on and such. start from scrathc and work from there.
-Aaron-

yea alright ill give it a try

[Kamakaze]

i know this sounds stupid but have you tried diffferent RCAs. a bad RCA can make weird things happen.make sure bass boost is all the way down, gains are all the way down. low pass is on and such. start from scrathc and work from there.
-Aaron-

damn man i tried all that an i still got probz? Any other suggestions

i know this sounds stupid but have you tried diffferent RCAs. a bad RCA can make weird things happen.make sure bass boost is all the way down, gains are all the way down. low pass is on and such. start from scrathc and work from there.
-Aaron-

damn man i tried all that an i still got probz? Any other suggestions

My popz suggested I put caps goin from the terminal to the to block DC. Would that work?

[praetor]

yeh that would work, but you need a special type of cap. can't remember what its called...

i don't really understand why you are getting DC from the amp though. only thing i can think of is that you are clipping your inputs - ie the voltage level coming into the amp is too high which clips (goes from ac to dc) the input circuits. if the input clips then your output will also be clipped.

how are you measuring the dc coming from the amp?

[Hanyo]

fried subs can be from alot of problems. Runing too low of an ohn subwoofers. Or maxing out your amps limit causing them to clip and blow either the amp or the subs.

Do you turn up your system alot? I've rarely see subwoofers and amps burn out under everyday use.

you got to give us more info on how each set up was installed. Paralled speakers, cross over... ect

[Kamakaze]

fried subs can be from alot of problems. Runing too low of an ohn subwoofers. Or maxing out your amps limit causing them to clip and blow either the amp or the subs.

Do you turn up your system alot? I've rarely see subwoofers and amps burn out under everyday use.

you got to give us more info on how each set up was installed. Paralled speakers, cross over... ect

Okay well the set up I have now is with a line output converter-taking audio signal for the rear left speaker. rca's back to the kenwood amp and from the amp i hav one speaker wire split into two to wire the dual vioce coils on the L5 to parallel i believe




Like that

yeh that would work, but you need a special type of cap. can't remember what its called...

i don't really understand why you are getting DC from the amp though. only thing i can think of is that you are clipping your inputs - ie the voltage level coming into the amp is too high which clips (goes from ac to dc) the input circuits. if the input clips then your output will also be clipped.

how are you measuring the dc coming from the amp?

And you know that sounds about right. Because it does onli as i turn the volume up

[pittfirefighter]

BAD BAD BAD BAD BAD BAD BAD.... VOICE COILS IN SERIES!!! NOT PARALLEL!! and then you have the subs in parallel?? your OHMS ARE WAY TOOOOO LOW!!! 4 ohm voice coils or 2ohm??

run postive into first coil, negative from first coil to positive on second coil, and negative out on second coil.... and then run subs in parallel.... no wonder you are blowing subs....

you are clipping like crazy due to the low resistance...

This post has been edited by pittfirefighter: Apr 30, 2007 - 11:16 PM