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  1. #1

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    Default Need help wiring new polk speakers to amp properly

    I Have A Thunder 4 channel marine amp in my boat with 4 polk Db 651's with each speaker on its own channel, however I have just added 2 more Db651's to my wake tower. My confusion is how to hook them up without frying speakers or the amp. The amp is rated at 4 ohms 50 watts per channel and can operate at 2 ohms at 75 watts per channed. I want to have the tower speakers hooked up to the two rear channels and all the rest ( inside boat) speakers connected to the two front channels. I thought after reading posts here and other places that I should series wire the inside boat speakers which would reduce the load to 2 ohms, But I then read that all four channels should operate at the same ohm load. When I say series I mean the negative from one speaker goes to postive of next speaker. Any advice would be greatly appreciated as how to do this properly Bob

  2. #2

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    by wiring in series, u will get 8ohms
    ur amp is 2ohm stable stereo, so use that

    plug in the tower speakers on rear channels, 4ohms per channel
    plug 2 speakers parallel in each front channel, 2ohms per channel
    Pioneer DEH-1600
    polkaudio db 650
    polkaudio db 675
    polkaudio momo 10"
    KICKER zx650.4

  3. #3

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    You can run the amp channels however you would like as long as you do not go below the minimum impedence. 2ohms on the front and 4 ohms on the rear is fine.

  4. #4

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    Thanks for the information- I am going to finish wiring today.
    Deck: SONY CDXF50M AM/FM/CD/MP3
    Amp: Mtx Thunder marine TM904
    Sony RM-X55M Wired marine remote control
    6 Polk Db 651's

  5. #5

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    I have another question. If i am running the 4 speakers on the front channels at 2 ohms does that mean the amp can put out the rated 75 watts and or am I getting more power or drawing more power. I am new to the amp thing and trying to understand for future installations.
    Deck: SONY CDXF50M AM/FM/CD/MP3
    Amp: Mtx Thunder marine TM904
    Sony RM-X55M Wired marine remote control
    6 Polk Db 651's

  6. #6

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    doesnt matter how many speakers u running

    if final load on the amp channel is 2 ohms, it will be pumping out 75watts

    since u wired ur speakers in parallel, each speaker will get half of the current or power ie 37.5watts
    Pioneer DEH-1600
    polkaudio db 650
    polkaudio db 675
    polkaudio momo 10"
    KICKER zx650.4

  7. #7

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    Thanks I think I am getting it.
    Deck: SONY CDXF50M AM/FM/CD/MP3
    Amp: Mtx Thunder marine TM904
    Sony RM-X55M Wired marine remote control
    6 Polk Db 651's

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