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Thread: Sub Painful Rumble w/HeadUnit Off

  1. #1
    Newbie
    Join Date
    May 2008
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    2

    Sub Painful Rumble w/HeadUnit Off

    Hello everyone,

    Here is my setup first:

    Pioneer Avic D3
    bose Tweets
    Memphis Audio Power Reference 6x9
    Memphis Audio Power Reference 6.75 doors
    Memphis Power Reference Sub in Sealed Enclosure
    Memphis MCA-2004 4channel amp
    Memphis 16S1.500 Mono Sub Amp

    Recently, I have been getting a jumbled/loud/rumble noise through my sub, totally random, kinda scary when its loud, whether I'm listening to music or not. Even with the headunit off, also even if I select the "sub off" option in the headunit and the headunit is off. The only thing that solves it is disconnecting the sub speaker wires.

    Any suggestions on what is causing this? I am assuming its the sub amp, since regardless of the head unit being on or off it still happens. I'm afraid its going to blow the sub.

    Also, I don't get any sound anomolies from the other speakers when this happens. So it seems sub isolated.

    Any thoughts, beyond appreciated.

  2. #2
    Newbie
    Join Date
    Jan 2005
    Posts
    36
    I'm a noob in this and all, but when I recently connected my sub - it has a 3rd wire that comes with the power loom - delayon or something like that. That has to be connected to the amp (or headunit) that bypasses the bass signals . That is to say that the sub is permanently connected to the battery but has an internal relay to turn it on or not based on whether the delayon is high or low.

    Maybe?

  3. #3
    Variable Bitrate bambam's Avatar
    Join Date
    Dec 2004
    Location
    Upstate New York
    Posts
    276
    Quote Originally Posted by maded View Post
    I'm a noob in this and all, but when I recently connected my sub - it has a 3rd wire that comes with the power loom - delayon or something like that. That has to be connected to the amp (or headunit) that bypasses the bass signals . That is to say that the sub is permanently connected to the battery but has an internal relay to turn it on or not based on whether the delayon is high or low.

    Maybe?
    You're right. There is a wire from the head unit that signals amp on/off and that wire goes to the amp. Your amp is wired to the "battery" so it always has power going to it but it only turns on when it gets that signal (via the wire) from the headunit and conversely, turns off when the headunit goes off.
    "Imagination is more important than knowledge." -AE

  4. #4
    Maximum Bitrate
    Join Date
    Jun 2005
    Location
    chicago, Illinois
    Posts
    752
    They are correct in stating that you need to properly hook up the remote turn on to the deck. Secondly, it doesnt appear that it is a problem with the radio, since it happens when it is off. so the problem may lie anywhere between the RCAs and the amp (which may be going bad).
    "In the beginners mind there are many possibilities, but in the experts mind there are few."- Shunryu Suzuki
    "Do it right or don't do it at all"

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