CarForum.net - Car Forums, Automotive News and Community
Home Gallery Register Calendar Members List

Go Back   CarForum.net - Car Forums, Automotive News and Community > In Car Electronics > Audio

Reply
LinkBack Thread Tools
Unread 08-05-2008, 01:09 AM   #1
Junior Member
 
TruAmbitionz's Avatar
 
Join Date: Apr 2008
Posts: 15
Rep: 10 TruAmbitionz is on a distinguished road
Default Car Amp Troubles...I'm on my last limb.

I've had an Alpine V-Power MRP-M450 Mono Amp in my car for about 4 months. I've been jamming to music with no problems and it's moving my sub great. As of a 3 weeks ago it's been cutting off.
Thing is..it works...but turns off after the volume is turned up past a certain point. I work at Best Buy so I had the car audio installers take a look at it.

They checked the fuses, wiring, voltages, etc, and seemed stumped. They tested the speaker seperatley so it's not the speaker. They wired the speaker as 2ohms and 4 ohms and still the same problem. It's not blown because it does work, just can not be turned up loud or else it cuts off. They think it might be in shock from overuse but I never really blasted it too much or used it constantly.

My last hope was to send it back to Alpine for repairs.

2 weeks later (today) I get in back in from Alpine, I hook it all up.

GRRRR AGASGDGFHN.

Still doesn't work. I don't know what to do.

TruAmbitionz is offline  
Reply With Quote
Unread 08-05-2008, 07:11 AM   #2
Junior Member
 
Join Date: Jul 2008
Location: Ann Arbor, MI
Posts: 16
Rep: 12 laboitenoire is on a distinguished road
Default

Are your wires heavy enough gauge? Maybe you have a wire or connection that's temporarily losing contact when you're drawing the current needed at high volume. Just an idea... Also, the amp's not going into a thermal protect mode, is it?
__________________
Just your average grad student...

laboitenoire is offline  
Reply With Quote
Unread 08-05-2008, 10:36 AM   #3
Junior Member
 
TruAmbitionz's Avatar
 
Join Date: Apr 2008
Posts: 15
Rep: 10 TruAmbitionz is on a distinguished road
Default

Quote:
Originally Posted by laboitenoire View Post
Are your wires heavy enough gauge? Maybe you have a wire or connection that's temporarily losing contact when you're drawing the current needed at high volume. Just an idea... Also, the amp's not going into a thermal protect mode, is it?
Hmm.
What would thermal protect mode and how could I tell it is going into that mode?

TruAmbitionz is offline  
Reply With Quote
Unread 08-05-2008, 02:00 PM   #4
Junior Member
 
Join Date: Jul 2008
Location: Ann Arbor, MI
Posts: 16
Rep: 12 laboitenoire is on a distinguished road
Default

Well, if the amp is really hot when it starts cutting off, that's usually the way you know it's going into a thermal protect mode...
__________________
Just your average grad student...

laboitenoire is offline  
Reply With Quote
Unread 08-05-2008, 02:53 PM   #5
Veteran Member
 
Funkycasey's Avatar
 
Join Date: Aug 2006
Location: Arkansas
Posts: 694
Rep: 71 Funkycasey will become famous soon enough
Default

Are you sure you have secure connections from the battery of your car to the amp? Also, Check your Ground wire. You need to make the ground wire is the same gauge as the power wire, it is less than 3 feet long, and that it is securely connected to an unpainted/un-rusted surface.

My bet would be the ground wire.

Funkycasey is offline  
Reply With Quote
Unread 08-06-2008, 01:20 AM   #6
Junior Member
 
TruAmbitionz's Avatar
 
Join Date: Apr 2008
Posts: 15
Rep: 10 TruAmbitionz is on a distinguished road
Default

The ground cable is the same gauge as the power line and is less then 3 feet.
Im positive it has nothing to do with temperature. The connections have beeen tested by numerous installers and friends. The ground has been connected to the same spot for 4 months and worked. Is it possible I need a new battery?

TruAmbitionz is offline  
Reply With Quote
Unread 08-06-2008, 07:21 AM   #7
Veteran Member
 
Funkycasey's Avatar
 
Join Date: Aug 2006
Location: Arkansas
Posts: 694
Rep: 71 Funkycasey will become famous soon enough
Default

Possible the voltage is dropping below the amp's desired voltage. You should idle the engine and turn the amp on until just before it turns off and check the battery voltage with a volt meter.

Funkycasey is offline  
Reply With Quote
Unread 08-08-2008, 01:20 AM   #8
Junior Member
 
TruAmbitionz's Avatar
 
Join Date: Apr 2008
Posts: 15
Rep: 10 TruAmbitionz is on a distinguished road
Default

Well after having 5 techs and installers from different stores and business look at my situation and tell me the amp is bad. An old friend of my fathers took a look at it and said it's actually the speaker. At a certain volume the speaker starts to malfunction and the amp, in an attempt to protect itself, shuts down. This makes it seem like the amp is cutting off from a lack of power or malfunction. When it's just trying to save itself from a malfunctioning speaker.

Long story short, I bought a new speaker, same specs but from a different brand and everything works great.

TruAmbitionz is offline  
Reply With Quote
Unread 08-11-2008, 12:38 PM   #9
Boosted Audiophile
 
pbasil1's Avatar
 
Join Date: Jul 2006
Location: N. AL
Posts: 2,627
Rep: 202 pbasil1 has a spectacular aura aboutpbasil1 has a spectacular aura aboutpbasil1 has a spectacular aura about
Default

wow. what sub did you have before? Sounds like it was probably too low an impedence for the amp....
__________________
2012 Lancer Evolution GSR
2010 Mazda CX-7 - The wife's car
1995 Taurus GL - Daily Diver
1991 Supra 1JZ - Sold (regretfully)

"Its worse than porn...at least I can get a girl...no way I can get that car. lol" -Gandalf
ONEPerformance

pbasil1 is offline pbasil1's Gallery  
Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 08:19 PM.

Shogun Interactive Development Copyright 2015 Shogun Interactive Development. All rights reserved.