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'07 Nbs Sierra Amp Speaker Install Problems

dsmazz

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dsmazz Enthusiast

dsmazz

Posted
Posted

I have a 2007 NBS GMC Sierra with factory CD. It is not the Bose system.

 

Today, I had a Memphis MClass 4 channel amp and four Memphis MClass 6-1/2" speakers installed at a local shop. Kept the factory head unit.

 

Here's the list of problems.

 

The amp would not trigger, so they wired it through the O2 sensor fuse as a temporary fix.

 

Amp turns on with ignition, but the 10 minute delay between ignition off and door open is gone.

 

Fade from front to rear does not function properly. Put fade fully to front, all speakers go silent. One click toward rear, and all speakers have low volume equally. Volume equally increases at all speakers as fade is moved more toward rear.

 

Cannot isolate any individual speakers. Can only isolate both left speakers together. Pretty sure this is because Fade does not work properly.

 

Front right speaker has distortion, most noticeable on conversation stations like XM PR and all AM stations. Put Balance fully to left speakers, and distortion is gone. One click toward right speakers, and distortion sets in and gains as Balance is shifted more toward the right speakers.

 

All chimes for door open, seat belt, turn signal are gone.

 

Any ideas or suggestions?

Dyabolical Enthusiast

Dyabolical

Posted
Posted

First question is how reputable is the install shop? Sounds like they tried to improvise and failed.

 

Wiring to the O2 sensor is not a good idea....at all. Rewire the remote turn on to an accesory fuse in the dash fuse box, try to keep it off of anything over 20 amps. The thought that they used something like a O2 sensor worries me with that shop.

 

Problem number 2 is directly related to problem 1. The sensor power is not tied in to the 10 minute delay, so power gets shut off with the key. Wiring the remote to a 10 minute delay compatible accesory will allow the amp to remain on. However be careful or running an amp with the engine off. Amps can draw significant power and will drain a battery rather quickly.

 

Did the shop use some type of LOC or did they just hardwire it in? I do not believe the MClass amps feature high level inputs. Again, not sure the sheop knew what they were doing here, or a rookie was doing the work unsupervised. If a high level output is wired to a low level input, your sound is gonna be really messed up. It even sounds like the hardwiring is incorrect.

 

Direct problem from problem 4.

 

Problem 5 sounds like it is a speaker or speakers out of phase. Again, wiring is borked. Speakers out of phase basically means that the wire carrying the negative signal is connected to a positive terminal and vice versa on the other terminal. + to - and - to +. Normally this won't cause noise issues unless another speaker is wired correctly. That is, if 3 speakers are wired incorrectly and 1 is wired correctly, you will have a noise or distortion issue. If you disconnect that correctly wired speaker the others will of course sound fine. It all relates to sound cancellation and is a somewhat complex subject.

 

Problem 6 is a weird issue. Not exactly sure what is happening there.

 

 

 

Basically it sounds like the shop did a very poor job on the install. My advice would be to take it back and talk to a service manager and tell him what is going on. If they do not or cannot fix it, get your money back and find a better shop.

thecraft Senior Enthusiast

thecraft

Posted
Posted
Basically it sounds like the shop did a very poor job on the install. My advice would be to take it back and talk to a service manager and tell him what is going on. If they do not or cannot fix it, get your money back and find a better shop.

 

I agree... WTF were they thinking tapping into the O2 sensors? :confused:

bcar Enthusiast

bcar

Posted
Posted

RUN back to that shop as fast as you can and get your money back and NEVER go back. I would rather take it to a circuit city or best buy than go there!!!!

dsmazz Enthusiast

dsmazz

Posted
  • Author
Posted

The shop has the truck today, additional components are being installed, problems are getting resolved. This shop, has an excellent reputation. They stand behind their products and their installs. That's why I went to them. The owner is working with me and I have every confidence everything will be as it was designed later today.

 

Comments that bash don't really help me guys. I posted to get information so I would better understand what was going on. Nuff said.

Dyabolical Enthusiast

Dyabolical

Posted
Posted

Bashing doesn't help you per se, but you dont quite understand the severity of the mistakes made.

 

I would be very sure to have them replace all speakers and amps for free. Putting a 20v AC current into a 5v input is bad. Also i can almost guarentee the amp was clipped like crazy and your speakers were damaged to some extent.

 

It is great they are fixing the problems, but there should not have been the problems to begin with. You really do need to raise billy hell about it.

 

Did they offer any explanations as to why they really really REALLY borked up an install and made it potentionaly harmful to the vehicle computer management system?

dsmazz Enthusiast

dsmazz

Posted
  • Author
Posted

UPDATE - Everything is running perfectly. The owner did all the work himself today, rather than his installers, and kept me posted throughout the day. System sounds awesome, all other systems on the truck are working fine now.

 

I appreciate the responses here and the constructive comments.

thecraft Senior Enthusiast

thecraft

Posted
Posted
UPDATE - Everything is running perfectly. The owner did all the work himself today, rather than his installers, and kept me posted throughout the day. System sounds awesome, all other systems on the truck are working fine now.

 

I appreciate the responses here and the constructive comments.

Good to hear.

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