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

[lilmaniac2 5,000+ posts]

umm... somethings up with those coils... did u measure them while they were connected to the amp? take off the wires completely going to the amp and measuer JUST the coil

 

[Lakota 5,000+ posts]

umm... somethings up with those coils... did u measure them while they were connected to the amp? take off the wires completely going to the amp and measuer JUST the coil

I measured at the terminal cups on the box.

 

[lilmaniac2 5,000+ posts]

take the sub out then and measure it there with no wires attached

 

[Lakota 5,000+ posts]

I'm not really helping, But you got to tell me man. How in all holy he!! did they get the door to close, with 2/0 wire runing through ? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

That, I didn't see. But, I heard it took a little fighting:laugh:

 

[noob with an RS 10+ year member]

The HU: Brand new Pioneer DEH-P7700MPThe 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.

if you measured 0 at the preouts you mustve had the volume very very low, did it wrong, or that head unit is a piece of turd. did u set the gain? did u measure AC voltage at the amp? sub configuration regarding impedance?

 

[noob with an RS 10+ year member]

When I checked the impedance at the amp (speaker terminals) I got a very large number.

problem solved. if you've got a shit load of resistance at the amp, your amp is barely putting out any power.. i bet youve got voice coils wired in series...

 

[noob with an RS 10+ year member]

That's what I was thinking. But, if the coils went bad wouldn't the # on the dmm for impedance be really large?

uhhh didnt u say it was //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 

[theCybe 5,000+ posts]

we're done troubleshooting here, right? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[knukonceptz 10+ year member]

problem solved. if you've got a shit load of resistance at the amp, your amp is barely putting out any power.. i bet youve got voice coils wired in series...

If you measure impedance with the speaker attached to the amp, you will get readings that are not just of the speakers, but if the amp as well and that is not correct. He has since measured at the sub box - which we have determined to be the source of one problem and the woofers need to be checked directly.

 

[Lakota 5,000+ posts]

I hooked the subs up to my amp today. They were both playing, so obviously he must have a preout issue as well. The sub that read 1 ohm is blown, it plays a horrible sound. The one that's around 2.5 or 3 ohms is playing fine.

So my new theory is that he has preout problems and a blown sub.

 

[Lakota 5,000+ posts]

uhhh didnt u say it was //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

At the amp, not hooked up to the subs only.