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  1. #1
    Join Date
    Mar 2010
    Location
    Belton, SC
    Posts
    922

    Default Kamberra upgrades - feedback question

    So, I bought a couple amps and Infinity tower speakers off another member on here last year, and finally got around to installing them, along with the 2nd battery and ACR. I didn't bother with the switch as I don't feel it is necessary with the ACR for my set-up/usage.

    My problem is that I get the alternator whine through my cabin speakers now, which are connected thru the used Infinity amp that I bought. Didn't check TOO closely, but I didn't notice it from my tower speakers (thru my old Kenwood amp). ALL power wires for the whole stereo system come off the 2nd battery, except the remote turn-on for the head unit, which is off the dash rocker switch. Any ideas? Bad amp? Noise filter?

    NO, it doesn't look perfect, but it is outta site and outta mind. And the tower speakers are mounted like they are because they dont' fit under my bimini...but they work.DSC07350.jpgDSC07352.jpgDSC07355.jpgDSC07358.jpgDSC07359.jpg
    '00 Moomba Kamberra
    '06 Yamaha FZ1 & 6 dirtbikes for me & my kids
    '99 BMW 528it
    '06 Chevy Express 3500 (15 passenger)

  2. #2
    Join Date
    Jun 2012
    Location
    Sugar Land, TX
    Posts
    610

    Default Kamberra upgrades - feedback question

    Might try turning the gain down. I had to on my setup.
    2011 Mobius LSV

    Ron

  3. #3
    Join Date
    Mar 2010
    Location
    Belton, SC
    Posts
    922

    Default

    '00 Moomba Kamberra
    '06 Yamaha FZ1 & 6 dirtbikes for me & my kids
    '99 BMW 528it
    '06 Chevy Express 3500 (15 passenger)

  4. #4
    Join Date
    Feb 2008
    Location
    Traverse City, MI
    Posts
    2,388

    Default Kamberra upgrades - feedback question

    If your head unit is connected to the start battery and your amps are connected to the other that is a likely cause.

    Another thing that I've found is that the factory wiring to ground the head unit is really long - run a ground from the head unit directly to the battery that the amps are connected to and I bet your problem goes away.

  5. #5
    Join Date
    Jun 2007
    Location
    Vancouver, WA
    Posts
    4,038

    Default

    ^^^ Yup, common, clean ground to all will surprise you.
    Old enough to know better, young enough to do it anyway.

    2001 MobiusV

  6. #6
    Join Date
    Mar 2010
    Location
    Belton, SC
    Posts
    922

    Default

    hmm. I have all components to common ground EXCEPT the head unit, but I'm only getting feedback thru 1 of the amps.

    So to remedy:
    1- removed the tiny sub amp as it wasn't NEARLY strong enough
    2- hooked the subs to the white infinity amp and put the sub pre-amp's to it.
    3- wired cabin speakers and tower speakers to the OLD Kenwood amp

    Works awesome! Just need to upgrade cabin speakers now...and it is in the works
    '00 Moomba Kamberra
    '06 Yamaha FZ1 & 6 dirtbikes for me & my kids
    '99 BMW 528it
    '06 Chevy Express 3500 (15 passenger)

  7. #7
    Join Date
    Mar 2010
    Location
    Belton, SC
    Posts
    922

    Default

    Oh yea, I also want to switch my balast pumps to run off the 2nd battery instead of my cranking battery. Shouldn't be hard.
    '00 Moomba Kamberra
    '06 Yamaha FZ1 & 6 dirtbikes for me & my kids
    '99 BMW 528it
    '06 Chevy Express 3500 (15 passenger)

  8. #8
    Join Date
    Oct 2010
    Location
    Lake Wylie NC Area
    Posts
    772

    Default

    hmm. I have all components to common ground EXCEPT the head unit, but I'm only getting feedback thru 1 of the amps
    Unless your house battery is a complete stand-alone bank, which it doesnt sound like it as its connected with an ACR, then at the end of the day, all grounds are common and all lead back to the engine block. In most cases, we find the root cause of unwanted noise in boats with dual banks is the head-unit is still on the factory boat harness and draws from the main cranking battery, where as the amps are drawing from the house battery.

  9. #9
    Join Date
    Mar 2010
    Location
    Belton, SC
    Posts
    922

    Default

    Quote Originally Posted by MLA View Post
    Unless your house battery is a complete stand-alone bank, which it doesnt sound like it as its connected with an ACR, then at the end of the day, all grounds are common and all lead back to the engine block. In most cases, we find the root cause of unwanted noise in boats with dual banks is the head-unit is still on the factory boat harness and draws from the main cranking battery, where as the amps are drawing from the house battery.
    You're correct in my set-up. I actually suspected the same thing (head unit being supplied thru factory harness), so I wired the head unit main power to the house battery as well, and there was NO change. I think the amp has issues, and the noise is a tone that's above my 80Hz cutoff now.

    Not perfect, but it works and I'm happy with it
    '00 Moomba Kamberra
    '06 Yamaha FZ1 & 6 dirtbikes for me & my kids
    '99 BMW 528it
    '06 Chevy Express 3500 (15 passenger)

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