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12 channel low power "D" chip amp

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  • 12 channel low power "D" chip amp

    I would like to buy or build a 12 channel 15wpc "D" chip amp (I am looking for the least power consumption) for our home theater. All of my speakers are 100db or better efficiency, and my subs have their own amps. Any suggestions as to what I can buy to make a 12 channel amp?

  • #2
    Re: 12 channel low power "D" chip amp

    At 100dB sensitivity, you certainly don't need much juice. You could try six of these:
    http://www.parts-express.com/dayton-...odule--300-385
    You only need a beefy 12V supply, which is not difficult to find. With your speakers, depending on impedance, you may find that half the recommended current is more than sufficient.

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    • #3
      Re: 12 channel low power "D" chip amp

      Six of these
      http://www.parts-express.com/2x50w-t...board--320-301
      and six of these
      http://www.amazon.com/Replacement-Mo...p+power+supply
      Your avr will act as volume control.
      " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

      Quote Originally Posted by hongrn. Oct 2014
      Do you realize that being an American is like winning the biggest jackpot ever??

      http://www.midwestaudioclub.com/spot...owell-simpson/
      http://s413.photobucket.com/albums/pp216/arlis/

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      • #4
        Re: 12 channel low power "D" chip amp

        Originally posted by ellisr63 View Post
        Any suggestions as to what I can buy to make a 12 channel amp?
        Class D amps have high switching currents in the 350KHz-700KHz range, and multiple amps that aren't synchronized can result in beat frequencies that are in the audible range. For example, if one amp is running at 400KHZ and another at 410KHz, there can be a 10KHz tone generated that won't be completely suppressed by the power supply. So you should look for class D amps that have synchronized clocks, or else use an amp with a spread-spectrum modulator. Alternately, you can use multiple power supplies. The 6-channel TDA7498 board from PE uses a common clock to synchronize the amps, which gets around the beat frequency problem. However, the schematic shows a ceramic capacitor in the output filter that will result in relatively high distortion (see this link). If you can modify the TDA7498 boards to use better output filters it would be a good way to go.
        Free Passive Speaker Designer Lite (PSD-Lite) -- http://www.audiodevelopers.com/Softw...Lite/setup.exe

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