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.
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on some amps there is a duel light. red and green usually. red means it is in protect mode or you didn't hook up your remote wire. if in protect mode, it could mean a number of things. did you hook it up with speakers and everything?
Hello hexi_86, The amp is going into protection mode. If it goes into protection immediately upon power up, either the amp itself is defective or it is getting too high or too low of a voltage or current, or the outputs are shorted. 1) Make sure that the battery voltage, as measured at the amplifier?s +12 volt and ground terminals, is 11 volts or more (your alternator voltage is typically about 13.8 volts). So if you have 11 or less at the amp terminals, your wiring is too small or defective. 2) Check all +12 volt and ground connections. 3) The use of loudspeaker impedances below the recommended minimums will cause the amp to draw excessive current. Check by removing the speaker wires one at a time to locate a shorted wire or defective speaker. 4) Check all speaker connections. 5) Remove RCA inputs and see if the amp powers up properly. A shorted or grounded RCA cable can cause the amp to go into protection. If all these check out, the amp itself is probably shorted internally, most likely the output MOSFET's. In this case it needs professional repair or replacement. Hope this helps.
i had an amp that did that for a while before frying. its possible that it could be overheating causing it to go into protection mode which can be fixed with a cooling fan or remounting it somewhere else so it can get some air. it needs to be mounted in a way that it will have at least 1/2" clearance under it so it can have plenty of airflow.
the other thing is you may be putting too much of a load on the amp causing it to go to protection mode. check and see how u have the sub wired and if the amp is stable. if u have the sub wired at 2ohm for more power output and the amp is only stable at 4ohm, then the amp will overload and cause the problem your experiencing. thats what happened to my amp. i had it wired for more than it was stable for and it fried
Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. Clipping means you have exceeded capacity.
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If the amp goes into "protect mode" immediately upon power up, it's most likely a short in the power/ground or speaker connections. If it operates normally for awhile and then goes into protect, it's most likely overheating.
In the first case, I'd suspect something in the wiring. Go here to troubleshoot the possible causes.
An amp will most often go into protection from overheating due to being operated at too low of an impedance load. Check the speaker specifications and wiring and make sure that the final impedance load matches the amps rating.
This is common when the output transistors have failed. The amp powers up and the amp senses a problem and goes into protection mode. Generally, there is a protection LED but not all amps have them.
To be sure that the problem is not installation related, check the DC voltage across B+ and ground when the amp tries to power up. If the voltage remains above 11 volts, the problem is almost certainly due to a failed component in the amplifier.
Disconnect the signal lines and all speakers (disconnect the wires from the amp terminals) and try to power it up. If it powers up, you could have a defective speaker or defective wiring. If the amp still fails to power up, the amp should be checked by a qualified tech.