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MTX amp blowing


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surendrant 
Member - Posts: 34
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Joined: February 24, 2006
Posted: June 07, 2006 at 11:41 PM / IP Logged  
I installed an old MTX amp in a 2003 honda civic. I don't know the model number but it 500 watts RMS @ 2 ohms. Its a being used to run a 10" MTX Thunder sub i believe its about 400 watts RMS. I've done a lot of amp installs so i'm 100% sure the problem isn't in the wiring. The remote wire is ok, and the 12+ wire is ok , and the ground seems to be good too, it's grounded to the chassis and the paint has been scraped off. But when i hooked up this amp with the gain at zero, the amp started smoking. I opened up the amp and a few resistors are burnt to a crisp. I have no clue why this would happen and just my luck, my multimeter is broken. Any ideas?
pmh61 
Copper - Posts: 151
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Joined: April 06, 2003
Location: United States
Posted: June 08, 2006 at 12:02 AM / IP Logged  
what size of fuses are in it and if there is not any in the amp how big of an inline fuse are you using from the battery? start there i guess
aznboi3644 
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Joined: May 01, 2006
Location: United States
Posted: June 08, 2006 at 12:14 AM / IP Logged  
Check if the power and ground and remote wires are touching where connected at the amp.
aceracer24 
Copper - Posts: 140
Copper spacespace
Joined: May 30, 2006
Location: United States
Posted: June 08, 2006 at 12:50 AM / IP Logged  
Not sure how old is old but i now there is a low/high input on mine that says if you have it for low input and you use high input wiring you'll damage the speakers. Low input would be RCA cables and high input would be wired from the deck. DOn't ask me why high would be wired from deck...I always thought RCA at 5v was high but according to the manual for the amp, thats considered low /shrug worth a check anyway.
1968 VW Beetle
Pioneed DEH-780MP, 2 10' Memphis PR104D, Memphis PR500.1, TXC 6.1, MTX Thunder 8502
surendrant 
Member - Posts: 34
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Joined: February 24, 2006
Posted: June 09, 2006 at 3:34 AM / IP Logged  

my ground is fine, none of the wires are touching. the amp has 3 25 amp fuses and the 10 guage kit i'm using has a 60 amp fuse.  Even if the amp wasn't gettin enough current i'm pretty sure it would just overheat not smoke cuz i didn't even turn up the gain or the deck volume. I'm thinking its a problem with the RCA's from the deck, its used and i don't know its history. Its a pioneer P4700 MP. Any ideas?

aznboi3644 
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Posted: June 09, 2006 at 7:48 AM / IP Logged  
WHOA WHOA WHOA HOLD UP!!!
Your amp is fused at 75 amps and you have 10 GUAGE POWER WIRE. This could possibly be the culprit. Dude 10 gauge is like for a 200 watt max amp. You should ATLEAST get a 4 gauge kit. Even if your inline fuse is a 60 amp fuse that 10 guage wire cannot supply the amount of current your amp may pull.
500 RMS is WWWAAAYYY too big for a little 10 gauge kit.
GET A BIGGER KIT!!!! ATLEAST 4 GAUGE!!!!
No one here thought this could be the problem because MOST people would not even think that you have a dinky 10 guage power wire.
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: June 09, 2006 at 8:34 AM / IP Logged  

Your power wire size will not cause the amp to fry.  Using too small wire guage will cause the wire to fry (and maybe your car, too.) 

Either the amp is defective, or it has been severely overloaded.  In any case remove it from your vehicle and get it repaired.

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Velocity Motors 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: June 09, 2006 at 9:23 AM / IP Logged  
Sounds like you reverse the (+) & (-) wire to me. Not implying that your not capable of installing an amp properly, but if an amp starts smoking when the gain is set to 0 when it's turned on, then there's a dead short somewhere and if the fuse didn't blow at the battery or at the amplifier, then this could be the culprit.
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
surendrant 
Member - Posts: 34
Member spacespace
Joined: February 24, 2006
Posted: June 09, 2006 at 1:52 PM / IP Logged  
lol, i checked that one too, the wires are going to the correct terminals. The weird thing is before this amp i tried a 300 watt rms amp and it would just keep blowing its fuse and the power light would continuosly stay on even when i removed the remote wire. The light would only go off when i removed the power wire or the rca wires. So i decided to try another amp and this is what happened. Also when i ran the power wire the inline fuse was blowing cuz there were some cuts in the wire that happened when i was putting everythin back but i solved that problem taped up all the exposed spots. I'm starting to think this is a problem with the deck maybe its giving an extreemly high rca out for some reason?
ferretvw 
Copper - Posts: 188
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Joined: September 29, 2005
Location: Pennsylvania, United States
Posted: June 09, 2006 at 2:37 PM / IP Logged  
have you tried a different set of RCA's?  It is possible you could get the amp into protection that route.....
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