I have to fix a halfassed install, help find the problem

[Lakota 5,000+ posts]

The HU: Brand new Pioneer DEH-P7700MP

The amp: Ed NIne.1

The subs: 2 type r's dual 4's, wired to 1 ohm

Let's start off with the little entertaing story. I was supposed to install my friends system a couple of days after I told him that I would do it. Being impatient, he went ahead had somebody do it that thought they knew what they were doing, but had no idea. Here's the list of the things they did wrong.

-The power wire was hooked up to the battery ground

-The inline fuseholder was IN THE TRUNK

-The 2/0 welding wire (the power wire) was ran through the door jam and into the hood!

-The speaker wires that were hooked in the amp were not secure and small piece of wire were hanging out and were possibly touching eachother. This is also the same for the power and ground. (The fuses in the amp blew when they installed it)

-The ground was not bare metal in the trunk

The RCA's and remote wire were ran through the vent on the top of the dash, over the dash and throughout the car. Both the power wire and RCA's/remote wire were 100% exposed. Even the power wire was laying in the back seat!

Now that you've read about how ghetto the install is, it's time to see if you can help me narrow down the problem, which I think i know what it is.

I reinstalled the system for him, but the output is very faint. I checked over the install completely, and it was correct. The amp is fine, it works in my truck. The RCA's are fine, they also work in my truck. I measured the voltage of the RCA's in his car and it read 0 (which is why I believe the output of his subs were so low). I also checked the voltage of the amp in his car, it read about 12.5 w/ the engine off, so the voltage is fine. The preout for the sub is turned on on the hu.

Now my question is, could the preouts on the hu have went bad since the install was so ****ed up? This is the only thing that I can think of.

Click to read more...

 

[Mr. Opportunist 10+ year member]

the subs are out of phase most liekely...

 

[Lakota 5,000+ posts]

the subs are out of phase most liekely...

I played with the phase on the amp, it didn't fix the problem.

 

[Mr. Opportunist 10+ year member]

not phase on the amp, how the subs are wired...

 

[Rattlebrain 10+ year member]

if the speakers are wired out of phase. switching the phase on the amp would do nothing.

 

[Lakota 5,000+ posts]

They are wired to the amp correctly. Should I reverse the polarity?

 

[forbidden 10+ year member]

Disconnect the subs entirely and hook up one voice coil at a time only.

 

[Blazin_Jason 10+ year member]

You read that the voltage on the rca's for the amp is zero. You know the amp works in your truck. So its gotta be %100 the hu pre-outs. It could have happenned when it was installed before. You already know the problem. =)

Jason

 

[Lakota 5,000+ posts]

The voltage on my rca's are also showing 0 and my system works perfectly. hmm....

 

[knukonceptz 10+ year member]

Disconnect one sub speaker wire...do you have more bass? if yes - one speaker is 180 degrees out of phase (as one sub moves out, the other sucks in canceling each other out) This is what happens when you wire one sub correct and the other has the +/-'s backwards.

As for RCA with 0 Voltage - did you measure in AC?

 

[Mr. Opportunist 10+ year member]

for some reason he cannot understand what all of us are trying to say //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[Lakota 5,000+ posts]

Disconnect one sub speaker wire...do you have more bass? if yes - one speaker is 180 degrees out of phase (as one sub moves out, the other sucks in canceling each other out) This is what happens when you wire one sub correct and the other has the +/-'s backwards.
As for RCA with 0 Voltage - did you measure in AC?

I know I measured in DC. I might have also done AC too, I can't remember. I'll try that.

 

[Mr. Opportunist 10+ year member]

try changing the phase of the woofers!!!!

 

[Lakota 5,000+ posts]

for some reason he cannot understand what all of us are trying to say //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

I'm just wanting to know what to do about it if it's out of phase. You didn't explain what that means and what I need to do about it. I was also thinking that it was a RCA problem.

Now I wish I would have put his box in my truck when I put his amp in

 

[baseballer1100 5,000+ posts]

Wow that was hooked up really bad.