I just installed a new amp because my other one's outputs weren't working. My amp powers up and everything, just the sub isn't getting anything. Any suggestions on what's wrong?

 

pop the sub to make sure its is not blown

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wrx-killer-Sti eater &raquo;</TD></TR><TR><TD CLASS="quote">pop the sub to make sure its is not blown </TD></TR></TABLE>
Well, when my first amp quit working I pulled the sub and it didn't smell burnt, and didn't look burnt and when I move it in and out it doesn't make grinding noise, but it is kind of hard to push in, I don't know how hard it's supposed to be... but tomorrow I'm hooking my sub up to a friend's amp to see if it is blown. What would cause the outputs of an amp and/or a sub to blow at the same time?

 

You overload the amp, the outputs fry, sending a high voltage to the sub. That fries the sub.

 

yeah probably blew the sub.if you have a multimeter put it on the Ohms reading and put it on the sub and see if it reads anything, if it doesnt,push on it and see if it does,dependin on the sub it will probably read close to 4 or 2 ohms if it is good

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 02 accord &raquo;</TD></TR><TR><TD CLASS="quote">You overload the amp, the outputs fry, sending a high voltage to the sub. That fries the sub.</TD></TR></TABLE>
Overload as in turn up too loud or overload as in the fuse didn't blow when it was supposed to?

 

Either turned up too loud or running too low of a load, or both. Either way, the amp would overheat and something would fry.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 02 accord &raquo;</TD></TR><TR><TD CLASS="quote">Either turned up too loud or running too low of a load, or both. Either way, the amp would overheat and something would fry.</TD></TR></TABLE>
I opened up the amp and nothing looked scorched. I'm thinking it was something internally on the board. This was after I had it checked by a quality auto sound just to make sure it was toast... Thanks for the info by the way.

 

I've had outputs short out internally with no visible damage on the outside. It doesn't always have to blow up.

 

Alright, the sub is giving me resistance, but there is no power to the outputs on the amp, so I think that the headunit's RCA sub outputs are bad, which is unreasonable because it is a brand new head unit. Can I use the front or rear speaker RCA outputs and run the sub off of them? I have a hifonics zxi8006 amp.

 

Yes you can, all you need is a poor ground on amp to "blow" the RCA outputs on a HU, amp will try and get it's ground through the RCA signal return, almost always common with chassis, it blows the signal return trace on the circuit board, opening the circuit so no signal. it should have no effect on the front and rear RCA outputs. 94

 

Exactly how do I check if the RCAs are getting voltage, do I put the + on the inside piece and the negative on the outside piece of the + RCA cable?

 

You can connect a small speaker to the inside and outside "pieces" of the HUs RCA outputs, disconnect any speakers that are powered by the HU, turn up the volume, if you hear something the output is working.
I have an old set of headphones that I cut the headphone jack off of and connected a set of alligator camps to, left and right pos.(+) to one and the neg.(-) to the other, but any speaker will work. 94

PS, yes you can use a meter set to AC volts and connect the way you discribe, voltage will fluctuate but go up as you turn the volume up.

 

Nice, thanks.

 

None of my RCA outputs work at all. So should I just wire up the loc?

 

Your sure? 94

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote">Your sure? 94
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Yeah. When I plug them into the amp, with brand new RCAs I the speaker outputs on the amp don't get any power. I plugged them in right. I don't know what else could be the problem. I just put the loc in and it works now so I'm happy, until I put new speakers in, then how will I be able to amp them if none of my RCA outputs work?

 

Time for a new HU. 94

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote">Time for a new HU. 94</TD></TR></TABLE>
Can't I just put an LOC on the front and the the rear speaker wires and then amp them? I just bought a new HU. Or, maybe they RCAs don't work when you have speakers run off the deck itself?