Question about Crunch BLX1000D Car Audio Amplifier

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SOUND CUTS ON AND OFF WHILE PLAYING

THE SUOND FROM MY AMP RUNNING MY SUBS CUTS OFF AND ON THE LED STAYS ON.WHEN THE SOUND IS OFF I CANTAP THE AMP AND IT PLAYS AND THEN CUTS OFF AGAIN.THE WIRING IS FINE. IF IT IS A DRY SOLDER WHERE ON THE A BOARD WILL I FIND THE PROBLEM

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You may have solved your own problem. If you can tap the unit and have it work that is a sign of a loose connection. I would suggest if you have electronics background you check the circuit for a cold solder joint. Then use a soldering iron to go over the joint. Better still hear up the joint and use a desoldering device remove the old solder and then a soldering iron to apply new solder. This should do the trick it a cold solder joint is indeed your problem.

Posted on Sep 04, 2007

  • Henry McKelvey
    Henry McKelvey Sep 04, 2007

    I am a big fan of the OEM circuit diagram, You can try to contact the manufacture and get the diagram that way. Which to me is the best way of going about this task.

    Thank you,

  • Henry McKelvey
    Henry McKelvey Sep 04, 2007

    As for the bandpass box a book on filter design can help you with that. It will have the calculations you need to make and a parts list.

    I hope this helps.

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1 Answer

Xtc 7500w amp


The amp might be on protection mode when both subs are driven...sign of an overloading problem. Does it work fine at lower volume levels? Check also the amp's supply voltage if it fluctuates out of tolerance level...might also be a loose connection in the wiring or terminals in the supply rails.

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when you car is running, it charges the battery somewhat. So the voltage problem is not a problem. The red light means the amp is going into ''Protect Mode". This usually happens when something is wrong with the amp. Usually the amp is getting hot. Check all of you connectiong and check the final impedance of the subs. Make sure the amp can handle the impedance of the subs. If you need anymore help, message me.

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Speakers cut off when bass goes up


probably the amp going to safe or protect mode judging by the fact that you have 3 subs wired to it i would say it is not 1 ohm stable try disconnecting 1 sub and see if it still happens this will be running a 2 ohm load rather than 1 if it stops happening then you need to figure out a better wiring configuration that will work with your amp.

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It sounds like your amp is overheating.
Check to see if its location is well vented, in the past, I have had to install ports/ vents and sometimes fans, when an amp could not be relocated.
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1 Answer

Cd player plays, but no sound comes out of speakers.


first off the amp gets power straight from the battery. the amp is used to power the subs. the subs are suppose to be connected to the amp only( never the speakers).

for the second part you mostlikely killed the wires. you should get some one to look at it and check the wires. thee speakers might need to be re-wired

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Jbl amp kiskcs in and out


Something inside the amp is busted.... stop hitting it... and replace it.

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This indicates a possibility of a power supply issue, you may have to open up the unit and take voltage measurements to determine if the voltages are correct. In order to do this you will need a schematic diagram of the unit. Once you have the schematic you will be abor to tell which voltages are legitimate. I hope this helps

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1 Answer

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This could be a DC offset condition. Check you manual for what this means. Or other condition. First Disconnect the Subs and try it. If it still goes red then disconnect the RCA's and try it again. If the Led continues to go red after the click then the Amp is hosed. The Click you hear is an internal relay that cuts the subs in after a dely so you do not get the turn on THUMP of the radio at your subs.

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1 Answer

Stop putting out sound to subs


Ok This is a two channel High Current amp. It is stable to one ohm. If the Subs are single voice coil at two ohms the they have to be wired in Parallel that means (Red +) (Black -) are connected to the + and - of another sub and then the (RED +) (Black -) from both go to one output channel of the amp. You pair the other two in the same fashion on the other output channel. If you are getting no output (sound) at all first check if the amplifier is going into protect. (Usually indicated by a red led on the unit. If it is connect only one Sub to each output and see if the protect LED goes out. If it does then you should have sound at the subs. If not check that you have the sub output enabled on the HU some head units do not come with the sub output enabled on the HU. If every thig is enabled, with only one sub connected to each output and the protect LED is not on then your amp is probably blown and needs repair. Nice thing is that MA has a great warrenty policy. Check and make sure the protect LED is off. If it is on you probably have the SUBS wired wrong

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1 Answer

Driving in first gear


Your Amp is in protect. Disconnect your subs and turn it back on. IF the led goes back to green the you have a blown Sub and it will need to be replaced. If the amp stays in protect even with the subs removed the the amp is toast.

May 29, 2007 | MA Audio HK2000D Car Audio Amplifier

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