Question about Helix Software HXA-500Q MKII - 65W x 4 + 200 Watts 5 Channel Amplifier Car Audio Amplifier

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Helix HXA-500 tripping protection mode

Hello I recently developed a problem with my Helix HXA-500 amp. Upon initial power up I get the green LED showing normal status. However about .5 sec after power up it switches to protection mode with a yellow LED. Consulting my owner’s manual a yellow LED indicates “speakers shorted to ground”. But after checking OHM loads to each component every thing seems in order there. So I pulled out in interior of my car looking for breaks in the cabling shields. No breaks were found any where. So I decided to see if the amp would power up with the speaker leads completely disconnected. And I got the same result listed above. (Amp tripping to protection mode) So I decided to check external power lines for high resistances. And I found no resistance problems either. And the supplied voltage to the amp is normal as well. Around 13.5 volts (engine off) (14-15 volts running)

I can only conclude that it’s a problem internally to the amp. This amp has never been abused with vibrations or heat NORE driving low OHM loads.

Here inlays my problem: due to installation issues and space requirements I can not fit another brand/make of amp to replace it. Comparable amps are simply too large to fit into the allotted space. And since Helix/Brax isn’t sold in the USA any more finding a replacement has been very frustrating. Do you know of any companies here in the United States that are competent/capable of repairing my amp?

I should note that I have tried to contact Helix/Brax several times to no avail. In a effort to find a factory approved service facility. I guess they would rather ignore my e-mail/calls rather than translate every thing into german.

Thank you for your time and effort on this matter


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  • Venom2U Apr 19, 2008

    No i havent tryed unhooking the RCA's, however the same RCA's also feed a kenwood amp for the subs. And the kenwood powers up fine and puts out sound as normal. Given that the second amp functions normaly i didnt suspect a problem there. But i will check into it.

    Thank you for you time and effort.


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Have you tried unplugging your RCA's? There could also be a fault in the ground on the RCA cables.

Posted on Apr 19, 2008

  • Dalynn Turner Apr 19, 2008

    I'm getting in touch with an amplifier repair shop to see if they can help you with your issue. I'll keep you posted.

  • Dalynn Turner Apr 21, 2008

    Hello again =)

    Got in touch with

    Placing email here for you to read.

    Repairing the Helix should be no problem. The symptoms seem to indicate a bad channel. Any one of the 5 channels, when damaged, can cause the amp to go into PROTECT and shut the power supply down. When this happens, none of the channels will play.
    This amp uses TO-3 style outputs. We only stock a few of these style outputs, so we might have to order them. They should be readily available. The repair should take about 2 weeks. You get a 90 day parts and labor warranty. We pay return shipping.
    If you would like to send it in for repair, just go to and click on "Submit Repair". Once it arrives, we will contact you with an exact diagnosis and cost.
    Support Tech
    Amp Repair Center


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