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Old 12th November 2008, 09:52   #16
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My 75.4 amp is also having issue it plays well but if i play it for longer durations say 30 minutes or try to play loud it shuts either of front channels or sometimes even both, switch off the HU and try after half an hour and again it works fine, checked with my installer and as per him he found one loose soldering in amp and he fixed it, but it worked for just 2 weeks and again it started troubling me.Any pointers on this?
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Old 12th November 2008, 10:10   #17
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Quote:
Originally Posted by flipsyde View Post
or all of the above?
all of the above! :-)
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Old 12th November 2008, 17:46   #18
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Quote:
Originally Posted by Ajaybiz View Post
... if i play it for longer durations say 30 minutes or try to play loud it shuts either of front channels or sometimes even both, switch off the HU and try after half an hour and again it works fine, ...
Air circulation / amp cooling problem - "thodi hawa aane de"!
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Old 13th November 2008, 10:16   #19
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Nope that could not be the case as 99% of the time i run my AC as well :(, looks like need to checked up again or to put PC fans.
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Old 13th November 2008, 15:22   #20
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Even if AC is on, local conditions near the amp may cause temporary overheating. Below 35deg ambient, it is the airflow over the heat-sink that counts, not the ambient temperature in the cabin. No, PC fans will not be needed, just ensure that air-flow is not restricted around the amp.

Is your amp below the seat or behind the rear seats? I doubt if it will overheat in the boot; below the seat heat build-up is possible.
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Old 13th November 2008, 15:45   #21
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I think heat is one of the reasons why the 1004 has an extruded aluminum chassis vs the plexi of the 75.4

You running them bridged for a Sub Ajay?
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Old 13th November 2008, 15:47   #22
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Its behind rear seat and if its over heating issue then why not the rear channels are facing any issue, must be Amp needs some repairing work.
No man all channels are dedicated to their own spekers, i have Mono amp 301.1 but still its not connected.

Last edited by Ajaybiz : 13th November 2008 at 15:53.
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Old 13th November 2008, 17:08   #23
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Ajay, how thick is your power and ground wire for the 75.4?
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Old 13th November 2008, 19:53   #24
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Dont know much about those figures but its quite think and its done by Autofusion's Anwar and the fuse holder is showing 80A fuse so must be quite capable cable, same size cable is there for mono amp.Will post the pics tomorrow.
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Old 13th November 2008, 23:28   #25
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Quote:
Originally Posted by Sam Kapasi View Post
  • Check the thickness of the power cable - almost as thick as a pencil. red in colour. seems well insulated.
  • Check your grounding point at the chassis, if need be, remove, sandpaper and reconnect to chassis. - this seems fine too but i'l try sanding the chassis this weekend
  • Check the connection to battery and check battery terminal. - its properly connected. battery terminal also not shorting with anything
  • Last, but not the least, check for water/moisture leakage around the amplifier area. - this is the first thing i did. found nothing wrong
My replies in bold. Looks like I might need a new horn relay.
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Old 13th November 2008, 23:30   #26
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Quote:
Originally Posted by navin View Post
all of the above! :-)
Looks like I'm going to be spending this weekend with the car!!
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Old 14th November 2008, 00:15   #27
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How is your battery, asking since this happened after overnight parking where the battery might have lost some juice. Reply from a NON ICE person, please excuse

Then again it might be stupid since car would have been parked in office during day also.

Ill go with gain setting and wiring before anything else.

Last edited by Jaggu : 14th November 2008 at 00:20.
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Old 14th November 2008, 00:27   #28
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@flipsyde - is your power cable is having pencil thickness, red in color and have a transparent kind of insulation? Is that a BOSS or similar amp kit? Then you must change it.
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Old 14th November 2008, 10:30   #29
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My wiring kit is Scosche.
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Old 14th November 2008, 11:04   #30
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Quote:
Originally Posted by flipsyde View Post
Looks like I'm going to be spending this weekend with the car!!
Not if you are married! :-)

Now now try this. connect your front speakers to the the amp channels that your rear speakers are connected to and vice versa. now if your rear speaker trips you know that it is the amp that has a fault if it the front speaker that trips again check the wire and terminals of the front speaker
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