Question about Infinity Reference 1300a Car Audio Amplifier

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Thunping coming from subs when car is turned off.

I have an Infinity 1300A amplifier driving 2 10'' subs. I had the system for about one year when I would hear a thumping coming from the subs when the car was turned off. The amp and subs are unhooked now because it drains the battery. What would be causing this issue?
Thank you.
RT

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  • 14 Answers

2 things to try, one. run your RCAs on the opposite side of the car as the positive wire. if you still hear the thumping try changing your RCAs. if you still hear the thumping, try a different anp or head unit. if you still hear the thumping, your subs are blown. best of luck

Posted on May 11, 2009

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Posted on Jan 02, 2017

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4 quick checks. try lowering the gain on your amplifier. check if your sub or subs are not making the amplifier run lower than 2 OHM. check if the power cable is the right Gauge(4 Gauge) and the fuse is large enough for the amplifier. It should be slightly more than the fuse rating of the amplifier. check to see if your ground is secured properly to the chassis. dreamsystems

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The possible area is definitely in the stanby switching circuit. A damage to the relay drive has made the power to be continuously on without the remote switch. You can have two solutions, one you can ignore the fault for the time being and connect a second relay fromt the system to trigger the relay and subsequently switch the amplifier main power. Or you must open the set and look in the remote switching area for a jammed relay, a faulty transistor drive or activation of the bias to the relay drive by a faulty component. Check this out with a good multimeter and you will solve the issue. I hope my advice helps. Good day

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My protect light wont turn off and my ground is good and all other wires are good also!


is your sub/speakers ok? unplug and probe the speakers to see if any of them are grounding out... or your amp my be shot...

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MAKE SURE THE GROUND IS GOOD ON BODY OF CAR BOTH UNDER THE HOOD AND WHERE YOUR AMP IS GROUNDED

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First off which fuse is it? The inline fuse from the battery or the amplifiers power supply fuse? Blowing the main fuse from the battery is caused by either the load (your amp) drawing too much current or you have a short to ground somewhere. Maybe there is a tear in the 12Vdc line and it is shorting to the chassis of your car. If the amps power supply fuse is blowing as soon as it turns on your amp has a shorted power supply. This will require internal component changes by a technician. If it is blowing after operation at high volumes I would say change the impedance that the amp is driving. If you are at 2 ohm try to rewire your speakers for four ohm. (go from parallel to series wiring then bridge mono or operate the amp in stereo mode)

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if u have the amp bridged un bridge it. chack an see wat the ohms are on the subs an make sure the amp is stable to carry the ohm load..if u have 4ohm subs one sub per channel then u shud be fine that wud make the amp see 4ohms but if u have dual voice coil subs it cud be the configuration of the subs..here's a link on how to wire subs hope this help..http://mobile.jlaudio.com/support_pages.php?page_id=145

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1 Answer

All wires are hooked up but no lights come on, is


Hi Wex,

Wires being hooked up is fine. With no lights coming on the question becomes one of power.

Ground needs to be grounded.
+12VDC should have +12VDC
Remote should also have +12VDC when the stereo is on.

Check these with a volt meter. Negative lead on the ground terminal, Positive on +12V then Remote.

Both combinations should read +12VDC.

Next check the fuses if any that your amp has. Make sure they aren't blown.

Comment back if this doesn't point you in the right direction.

Mike

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1 Answer

Stereo makes a thump sound after a installed a mono amplifier, the noise comes from the subs it drives, its also present when i turn it off, just a single loud thump noise.


Are you turning of the amplifier first or the source of audio? Amps should be powered down first and then the source. If both are powered down at the same time make sure the volume is down or otherwise you will always get a thump. The opposite when you power up. The source and then the amp. Hope this helps.

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It sounds like you need to ask for pro help mate, mybe the amp just needs setting properly, Is the amp on bypass for bass, or does the amp run the complete system

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