Question about Kole audio Q2-480 Car Audio Amplifier

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How should I wire up this amp and sub

OK here is what I have, and I cannot find my amp manual. Kole Q2-480 amp Amplifier Type Dual Channel Bridgable Bridgable RMS Power at 4 Ohms 100 W x 2 RMS Power at 2 Ohms 125 W x 2 Performance Frequency Response 10 Hz - 30000 Hz Signal to Noise Ratio 98 dB THD at Rated RMS Power 0.02 % Crossover / Equalizer Bass Boost With Bass Boost Low - Pass Frequency 30 Hz - 500 Hz High - Pass Frequency 50 Hz - 500 Hz Other Features MOSFET Circuitry Yes 3 Way Ready Yes ------------------------------ Audiobahn AW831T 8" sub # 8" Natural Sound Subwoofer # 30 oz. Strontium Magnet # Power Handling: 200 watts R.M.S. # Frequency Response: 30Hz - 1kHz # Efficiency: 90.3 dB # PHAT Foam Surround # Non- Pressed, Non-Transfer Paper Cone # KM3? Coated for Virtually No Cone Distortion # 1.5? 4-Layer ASV Voice Coil # Dual 4 Ohm # 2 Ohm or 8 Ohm Operation --------------------------------- Empty MTX thunderform -------------------------------- Whats the best way to go about wiring this? The way I did it to test it out, was to bridge the amp, have the amp + wire to go the + terminal on one coil, the - amp lead to the other coils - terminal, then run a wire from the remaining + and - terminals on the sub. This sound right? Was pumping far less bass than I expected (and I wasnt expecting much) so want to make sure I am not doing this wrong.

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  • Ray jjj Jun 10, 2007

    The way you described to wire it is the way I had it. I have it like the pic at this link, to be sure is that what you were suggesting?
    http://akamaipix.crutchfield.com/ca/lear...

  • Ray jjj Jun 10, 2007

    Oh and thanks for the REALLY fast response! Do you think this is the way it should be wired?
    http://akamaipix.crutchfield.com/ca/lear...

  • Ray jjj Jun 11, 2007

    No way to get that sub to run at 4 ohms is there? I know the amp runs at 250rms @4ohms bridged. I may look for a new sub anyway, this thing doesnt fit all that well in my thunderform anyway!

  • Ray jjj Jun 14, 2007

    Thanks for the help and fast responses. I have up on that sub and am looking for something new. The shallow mounting depth of 3 7/8 is going to make finding a decent one a chore!

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The amp's not actually a very good match for the sub, since the sub can be wired for 2 ohms or 8 ohms, and the amplifier is most efficient at 4 ohms in bridged mode. My advice would be to wire the amp in bridged mode, and wire the sub for an 8 ohm load. To do this, the amp's (+) wire should go to the (+) terminal on one of the sub's voice coils. Then run a wire from the (-) terminal on the OTHER voice coil to the (-) terminal on the amp. The remaining (+) and (-) terminals (on opposite voice coils) should be connected to each other with a wire. Your original wiring setup had the amplifier connected to only one voice coil, while the other voice coil was shorted.

Posted on Jun 10, 2007

  • Brian Neathery
    Brian Neathery Jun 11, 2007

    Yes, I misunderstood your first description. I think the first diagram is the safest way to wire it. Here's the deal: the first diagram results in an 8-ohm load for the amp. This reduces the amplifier's power output in bridged mode, but the amplifier can run it safely. The second diagram, with your subwoofer, would result in a 2-ohm load at the amplifier. This would result in much more power, but there is a risk that the amplifier could overheat and shut down, or (in extreme cases) might result in amplifier damage. Most 2-channel amps aren't stable with a 2-ohm load in bridged mode.

  • Brian Neathery
    Brian Neathery Jun 11, 2007

    There's no good way to run that sub at 4 ohms. What you need is a single voice coil, 4-ohm sub rated for 250 watts; or a dual 2-ohm voice coil sub. Good luck!

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