Car Audio Technical Discussions Dedicated to the technical side of Car Audio.

amp shut off

Old Dec 13, 2007 | 06:16 PM
  #1  
kajenius's Avatar
Thread Starter
0 Watt CAFz'r
 
Joined: May 2007
Posts: 40
amp shut off

Hi there i have an mtx 4 channel amp that was working fine a few days ago.. Few days ago i crank up the volume it would play for a bit and go into protect mode n come back and go back in and so on n so on.. But at low volumes it works fine. What can this problem b?.
thanks
Old Dec 13, 2007 | 06:57 PM
  #2  
92zed34's Avatar
500 Watt CAFz'r
iTrader: (4)
 
Joined: Dec 2004
Posts: 812
The symtoms fit with shorting out speaker leads. I would look into that first,
Old Dec 13, 2007 | 08:07 PM
  #3  
JohnVroom's Avatar
Yankee
 
Joined: Oct 2003
Posts: 3,599
If it is a protection (you saw the protection light come on?) it sounds like thermal protection
Old Dec 13, 2007 | 08:17 PM
  #4  
MTT's Avatar
MTT
--SPECIAL ED--
iTrader: (17)
 
Joined: Jul 2006
Posts: 1,325
Originally Posted by JohnVroom
If it is a protection (you saw the protection light come on?) it sounds like thermal protection
my vote as well...check to make sure the load your amp is seeing isn't lower than the amps capabilities, also if your gains are too high and you're clipping the shiznit out of it, it can go into protect. does it have airflow around it?....
Old Dec 13, 2007 | 08:25 PM
  #5  
kajenius's Avatar
Thread Starter
0 Watt CAFz'r
 
Joined: May 2007
Posts: 40
sorry about that.. i just checked it, and its the thermal light..the sub is in the trunk.. soo im guessing it got enough room to breathe. But i dont knoe why it started outta no where, it was working fine... thanks for all the responds.. a
Old Dec 14, 2007 | 05:23 AM
  #6  
JohnVroom's Avatar
Yankee
 
Joined: Oct 2003
Posts: 3,599
OK too much heat, so the nex set of questions;

are all heat transfer surfaces free from obstruction
are you running a low impedance
hows your system voltage**
Old Dec 14, 2007 | 08:05 AM
  #7  
kajenius's Avatar
Thread Starter
0 Watt CAFz'r
 
Joined: May 2007
Posts: 40
all the speaker are 4ohm i rain it individiually.. so im guessing it running 4ohmx4
Old Dec 17, 2007 | 02:18 PM
  #8  
The Wizard's Avatar
50 Watt CAFz'r
iTrader: (2)
 
Joined: Nov 2007
Posts: 285
Originally Posted by kajenius
all the speaker are 4ohm i rain it individiually.. so im guessing it running 4ohmx4
Can you explain in better detail how you wired the subs at the amp?

Last edited by The Wizard; Dec 17, 2007 at 02:23 PM.
Old Dec 17, 2007 | 02:25 PM
  #9  
MTT's Avatar
MTT
--SPECIAL ED--
iTrader: (17)
 
Joined: Jul 2006
Posts: 1,325
Originally Posted by The Wizard
Based on the fact that you ran 4 sets of wires individually (wired them in parallel), that would make it a 1ohm load not a 4ohm load, and that my friend is your problem. Your amp is more than likely NOT 1ohm stable. Wire it for a 2ohm load and you will be OK. Edited to add: "fix this before you cook your amp".
It's a 4 channel amp, if the speakers are 4Ohm then each channel is showing 4Ohm, this isn't a mono amp.


Try turning your gains down, even a little too low and see if you can reproduce the thermal shutdown.

and x2 on checking the system voltage
Old Dec 17, 2007 | 02:37 PM
  #10  
The Wizard's Avatar
50 Watt CAFz'r
iTrader: (2)
 
Joined: Nov 2007
Posts: 285
Oops, guess thats what I get for surfing the web while at work, reading half of the post and trying to sneak in replies. I missed the 4 channel part of the post.

Thread Tools
Search this Thread

All times are GMT -5. The time now is 05:17 PM.