Question about MA Audio HK401SX Car Audio Amplifier

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My brand new system isnt working right...

I just purchased a brand new MA Audio car audio system, when i turn up the gain, the speakers have an extemely loud, constant bass hit. I went out and bought a bigger ground wire for it, and i also purchased new RCA wires as well, as i was told that might be the problem. I'm not really sure what is going on, because i literally just got the system brand new yesterday. I cant think of anything to do, or find the exact problem. Any suggestions or for sure answers would be greatly appreciated!! Thank You.

Posted by John Addison on

  • 1 more comment 
  • da big bitch Feb 10, 2008

    yeah, i have the same problem, i had my system wired before with an 8
    gauge wire which was way to small but it melted 2 of my fuses within a
    couple days. It was working and my solo X was kicking hard but now that
    i got everything re-wired with the zero gauge i havent heard the same
    sound quality that i heard before. i was showing my friends yesterday
    because i had just bought it and it was kicking but not to its full
    potential then after like 20 seconds of play it just turned off and the
    amp went into protection mode. the blue LED turned on and now the
    system refuses to play i dont know what the problem is but i wanna know
    if i could fix that. any suggestions would be helpful thank you.

  • juggalochant Jun 21, 2008

    i have a ma audio hk401sx and it was working then i switched it off and then it never turned back on? is there any reason or any way i can fix without sending it back? all wires are good

  • jrx7 Apr 26, 2009

    My problem is when I turn the gain a quarter of the way (not even), they continuously sound in a rumble (Definately not normal) Like it overloads the subs with too much power or something. like there is a switch or like a fuse trips and it the same sound out of 2 12 in subs no-name bandpass box from xscargo We've even hooked it up to a alpine type r swr-1022D in ported box and it does the same thing. We tried a different brand amp and it doesnt do it. Any ideas what the problem is and the 10 in was wired 4ohm



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All righty then, This is most often gaused by bad grounds. Make certain the ground of the amp is a solid clean connection. The best place is under one of the rear seatbelt bolts, next check the condition of the ground at the battery this has to be clean with a good connection to the chasis, third make sure the Head Unit also ahs a clean positive ground. If these do not yeild results then get hold of any littel portable radio, cassette player, mp3 player as long as it has a earphone jack. Get one of those cables that have a earphone plug on one end and RCA plugs on the other. Disconnect the RCA's from the HU and hook up the player. Power up the system and play back from your portable player, mess with the gain on the amp and see if you still have the same problem when playing back from the portable device. If the problem goes away then you probably have blown grounds on the RCA's on the head unit and only a repair shop can fix that or a new HU. If you still have the problem with the portable player then adjust your lowpass filters and cut off to a higher frequency until the problem goes away. The gain on these amps should never be used to make up for low output from the Head Unit. (another cause for this condition) Get a HU that has 4 to 6 volt sub outputs and crank the gain down on the amp. That gain control is to control distortion (over driving the amp) not to make it louder. If you want louder then go for the HU with the higher sub output voltage or go with a SUB with a lower ohm rating. Your amp is stable down to 1 ohm. Oh and double check if you have your subs wired correctly improper wiring at the subs can m ake this problem worse.

Posted on Jun 29, 2007


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