Question about Hifonics Brutus BXi 1206D Car Audio Amplifier

2 Answers

Protect Light Coming On - BXi 1206D

This is now my second BXi 1206D. I am having a repeat issue with this amp. The amp worked for a month or so, but now, when I turn it on, at low volumes the subs produce a crackle or a gurgle. At high volumes the protect light comes on and the amp shuts itself off. I have checked the wiring of my subs and ensured that I have a good ground and positive. I guess it is something. If I can't figure this out, I pretty much get screwed into shipping it $25 bucks each way to get it fixed under the sellers warranty. Considering that I bought the amp for 170, it is hardly worth $50 dollars to get it repaired, especially with the fear of the same issue recurring... again.
Any ideas? Thanks in advance,

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  • 3 more comments 
  • djdurable Jun 24, 2009

    I have a Pioneer AVIC-F700BT head unit with 4 gauge power and ground, and a Rockford Fosgate RCA wire. I tested the amplifier with different subwoofers, and the same problem is there. I also tested it in a different car with different wiring, thinking that it was possibly a bad ground or something along those lines.
    When I actuate the subwoofer by hand, there is no scraping. These subwoofers work on a friends amplifier.

  • djdurable Jun 25, 2009

    What do you mean by checking the amplifiers transistors? I don't have a problem using a DMM, but I honestly don't know what I'm checking for on the transistors. Any simpler way to put it?

  • djdurable Sep 30, 2009

    I have a Pioneer AVIC F700BT deck and 4 gauge power and ground wires. And a Monster shielded RCA cable.

  • djdurable Sep 30, 2009

    I have a Pioneer AVIC F700BT deck and 4 gauge power and ground wires. And a Monster shielded RCA cable.

  • Frank Fulton
    Frank Fulton May 11, 2010

    What type of Deck is in the car? and what type of amp kit are you using? Post a comment and I can help you figure this out.



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  • Contributor
  • 32 Answers

If you actuate the subwoofer by hand, do you hear any scraping sounds?

It's possible the voice-coil is rubbing and tripping the amplifiers protection.

Try the amp on a different sub.

Posted on Jun 24, 2009

  • Intager
    Intager Jun 24, 2009

    The gain on the amp is used to adjust for headunit outputs / level match. (.e.g. 6v / 4v / 2v) Headunits with higher output maintain a higher signal / noise ratio through the signal path, and don't require as much amplifier gain for a given output.

    Simply picking an arbitrary value such as "1" and declaring that optimum or maximum is fruitless.

    In any case, because your still getting sound (however garbled) at low output levels, you may be dealing with a shorted output. If your comfortable use a DMM to check the amplifiers transistors and inspect for blown ground traces as that can induce a DC bias curent into the amplifier stage.


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  • Hifonics Master
  • 1,114 Answers

Well, it looks like your amp has bit the big one. Only advice I can give you is to go easy on your next amp. Check your gain settings on the amp, they should never go beyond 1:00. Anything beyond that is really just gonna cook the amp literally. If you get a new amp, from Hifonics, sell it. They ain't what they use to be. They are now made in China and Tiawan. The printed circuit boards are paper thin and the traces are narrow, in the end they just cook themselves. Take a look at an American Made amp, the difference is in the PC boards! they use millitary spec boards which are 3 to 4 times as thick as a japaneese or chineese amps and the traces are wide and heavy. Basically, they are designed to be abused by us volume junkies and bass heads! It will cost more, but it's well worth it. Best of luck! anytime you've got a question post a comment and I'll help the best I can. I was in custom car audio (IASCA,etc.) for 13 years, Now I play with million dollar home toys. So generally, I can help... Enjoy!!!

Posted on Jun 24, 2009

  • Frank Fulton
    Frank Fulton Jun 25, 2009

    "1:00" is not an arbitrary # The Pioneer Deck has a 2v preamp the hifonics is .08-8v compatable. "1:00" is roughly 2.5v. Beyond that is "overdrive" If you want to check the transistors, you can, you need to know the value. for arguments sake if you have a resistance of 1. your transistor is wide open and bad. Your average transistor should read between.150 -.180 . The point is, if you want to crack the top of the amp, you will void the mfg warranty alltogether and chances are what you find that's bad will cost you more in parts then it will to ship it out. An average protection circuit is 60-80 in parts, the average transistor is 20-30 and there may be a bad trace as well. Sorry to step on you intager but most people on this site are NOT technicians, you need to explain a problem in a way people can understand, don't dazzle with technical knowledge most don't understand, nor do they need to.



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