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volume up and down


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aetnaboy74 
Member - Posts: 4
Member spacespace
Joined: November 14, 2010
Posted: November 14, 2010 at 11:44 PM / IP Logged  
whats up yall? im new here and really need some help. just had 2 alpine amps,door speakers and 1 12"sub put in my 02 mercedes. it sounds great when its playing rite, but the sound keeps going up and down. its like the power goes from 100% to 30% instantly.  its like somebody is in my trunk playing with a toggle switch. i caint take no more. the local sound shops cant find a problem so i hope i can get some clues to whats going on.
Let's get it!!
aetnaboy74 
Member - Posts: 4
Member spacespace
Joined: November 14, 2010
Posted: November 14, 2010 at 11:57 PM / IP Logged  

the ams are alpine mrp-f300, mrp-m1000. the door speakers are alpine sps-600c, and the sub is a alpine swx-1243. its on the factory head unit.

Let's get it!!
nicola019 
Member - Posts: 1
Member spacespace
Joined: September 20, 2010
Location: China
Posted: November 15, 2010 at 12:39 AM / IP Logged  
Maybe the power supply is not stable, check whether the GND is right connected to the chasis.
keep doing, running, learning
awdeclipse 
Copper - Posts: 285
Copper spacespace
Joined: August 05, 2007
Location: Michigan, United States
Posted: November 15, 2010 at 2:18 AM / IP Logged  
Did they use a line-out converter for your install? Start there looking for loose wires. Also does your stock radio have an auto-volume feature? If so disable it and see if the problem persists.
Do both amps cut out when the volume drops? Does this happen while driving, idling?
Is it repeatable, or does it happen completely at random?
i am an idiot 
Platinum - Posts: 13,313
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: November 15, 2010 at 5:00 AM / IP Logged  
Is there a mute button on the factory radio?  If so, when you press the mute button, does it completely silence the sound or does it attenuate the sound?
aetnaboy74 
Member - Posts: 4
Member spacespace
Joined: November 14, 2010
Posted: November 15, 2010 at 11:31 AM / IP Logged  
Yes, they did use a converter but as far as I can tell all the wires are ok there. It happens completely at random when the volume is at about 50% or less. But when I turn it up loud it will stay playing longer but eventually it kicks out again. And yes bothamps kick out. Ill have to check the auto volume and mute.
Let's get it!!
aetnaboy74 
Member - Posts: 4
Member spacespace
Joined: November 14, 2010
Posted: November 15, 2010 at 11:32 AM / IP Logged  
Yes, they did use a converter but as far as I can tell all the wires are ok there. It happens completely at random when the volume is at about 50% or less. But when I turn it up loud it will stay playing longer but eventually it kicks out again. And yes bothamps kick out. Ill have to check the auto volume and mute.
Let's get it!!

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