weird amp problem pls help......

[natedizzle 0]

i finally got my subs hook up and my monoblock going....so i know most of you have your gains set at a quarter and so thats what i did at FIRST. The dmm gain settings way wasnt working for some reason it kept reading the same numbers with the music going and the music off. Anyways i left the gains at a quarter for now and listened to it and i couldnt even feel the subs at high volume so i turned it up to half just to see the difference and then right as you get to half this HUGE rumbling comes from my subs and its constant even if the music is on pause...and this did happen but not as loud when i had my other amp at 4ohms.can someone pls help me with this??

here was a couple of things i was thinking...

1.preouts on pioneer HU

2.maybe bad ground

3.maybe need loop isolator???

[///M5 2,833]

1/4, 1/2, whatever that isn't right. Set your gains with a DMM and a test tone cd. You can also do it by ear, but since that's what you basically did above my recommendation is to use a DMM.

Hard to be of any other help, since you never told us if the noise went away when you turned down your gains...

[natedizzle 0]

i tried to set it with the dmm and the 50hz tone cd i burned but something was going wrong...when i put the leads in the + and - the readings were the same when the music was playing and when it wasnt.....that was my first time to ever use one so maybe i wasnt doing it right but i was pretty sure i was.The noise isnt there until the gain goes right about half then thats when i get the low constant rumble in the subs and i really high pitch kinda crackling sound in my mids and highs......hope that helps some.

[///M5 2,833]

Did you check your wires?

[natedizzle 0]

which ones??

[natedizzle 0]

it goes + - + - and i have the wires in the first set of + and -

[///M5 2,833]

With or without the rca's to the amp?

[natedizzle 0]

i tried doing all this when the rca's were in the sub amp....was i doing something wrong??/......do you know why the amp would be making those noises??? And how to i check my voltage to make sure its not too low and which setting do i use on the dmm???

Edited June 11, 2006 by natedizzle

[JimJ 11]

Usually flat lines indicate DC voltage settings, squiggly lines indicate the AC side. Set it to whatever decimal range you need, or if it's autoranging just connect it.

Getting noise in your front stage worries me, though...especially when it doesn't have anything to do with the amp being worked on. Sounds like you may have inducted noise issues to troubleshoot.

[natedizzle 0]

when i turn the gains on the sub amp down alot the noise goes away from the mids and highs so im still kinda thinkin maybe its my HU but im not sure.I just hate having the gains down that low cause i dont get any bass like that......well i do but you cant even feel it its so low......i took my head unit out to check...is there anything i can check with the rca's on the HU to find out anything???

Edited June 11, 2006 by natedizzle

[natedizzle 0]

hey guys does this pic look like the right way to have my subs wired???....like i said my subs have 1 set of + and one set of - on each side of the sub.

http://i61.photobucket.com/albums/h59/n8te81/wiresnow.jpg

[82buick 0]

hey guys does this pic look like the right way to have my subs wired???....like i said my subs have 1 set of + and one set of - on each side of the sub.

http://i61.photobucket.com/albums/h59/n8te81/wiresnow.jpg

<{POST_SNAPBACK}>

are your woofers double 4 ohms double 2 ohms

[natedizzle 0]

they are dual 4...so what do you think???

[82buick 0]

they are dual 4...so what do you think???

<{POST_SNAPBACK}>

so your saying that you have 4 pos and 4 neg on the woofers i don't think you have them wired right becuse you have one pos one neg that are not connected

Edited June 13, 2006 by 82buick

[natedizzle 0]

yep on each one....yeah i know its kinda weird i think.

[djjdnap 78]

i say try hooking ur amp to the other set of pre outs on ur HU and see if it goes away.

My buddys HU did the same thing, wt the whole rumbling noise.

I'd say chech the HU.

[82buick 0]

yep on each one....yeah i know its kinda weird i think.

<{POST_SNAPBACK}>

ckeck it out you said that you have a mono amp running the woofers

[natedizzle 0]

well since there is the sub out,front out and rear out,what other out could i use to test it on??....i mean isnt the sub one the only one i can use it on??

what buick???....i know i have a monoblock i was tryihg to get my subs at 1ohm....what did you mean with that?

Edited June 13, 2006 by natedizzle

[82buick 0]

well since there is the sub out,front out and rear out,what other out could i use to test it on??....i mean isnt the sub one the only one i can use it on??

what buick???....i know i have a monoblock i was tryihg to get my subs at 1ohm....what did you mean with that?

<{POST_SNAPBACK}>

ok try wiring them in paralle so that you are using all of your + - on your woofers

[djjdnap 78]

how u have ur subs wired isnt going to make them have a rumbling sound...

It will only make ur amp get hot and cut off from low impedence or it will work just fine but not be loud because of a higher impedence.

Its the HU

Just switch them to the front or rear pre outs and see if it still does it.

[natedizzle 0]

so maybe because of how they are wired they might not be as loud?? it really seems like they should be.

[djjdnap 78]

Basiclly for 1 ohm...hook all the negatives together and all teh positives together..

does ur amp have 2 inputs? or just one

like + - + -

or just one?

[natedizzle 0]

it has both but its bridged internally.....so you dont think its hooked up right?

[djjdnap 78]

in that case just hook them up seperate.

it would be easier and less confusing, lol

Still + to + and - to -

and run each to both channels on the amp..

so it would basicy be sending 4ohms into the amp and the amp bridging them for you, equaling 1 ohm...

But that still isnt gonna solve the rumbling problem..

at least i dont think soo.

[natedizzle 0]

ill have to look at it tomm and see what i can figure out.....im not a big audio tech so its hard me to do sometimes.