Question about Kenwood KAC-9104D Car Audio Amplifier

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I have a kac-9104d amp with 2 kenwood 12'' subs single voice coil 4 ohms kfc-w3012 400 watts rms 1200 peak. The amp is 500x1 at 4 ohms and 900x1 at 2 ohms. I have them wired to 2 ohms each. The amp cuts off after a while and the fuse doesnt seem blown but i replaced it anyways and it started to work and now it stopped playing. What is causing the amp to go in protection mode? Could it be the bass boost that i have all the way up?

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  • th3game_300 Jun 26, 2009

    http://image.caraudiomag.com/f/10522141/...




    The amp is a mono block but it has 4 terminals. How would i wire it to get 4 ohms? i have them set up in series right now so am i getting 4 ohms or 2 ohms? 1st sub( + to + - to -)second sub (+ to + - to -)

  • th3game_300 Jun 26, 2009

    Thats the wiring i have right now and i turned the bass boost down to half and its playing good now but when i turn it up a little loud it cuts off sometimes but other than that the fuse doesnt blow anymore. Thanks for the help.

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Posted on Jan 02, 2017

  • 740 Answers

SOURCE: repeated blown subs

Unfortunately some of these speakers today... DO NOT PERFORM up to peak as they should.The on logical reason for this to be happening it that the speakers are NOT very DURABLE and cannot take constant playing. I would recommend to L7 the can take alot more abuse than your average speakers. Good luck and thanks for using FIX YA

Posted on Mar 23, 2009

  • 1 Answer

SOURCE: how should i have my

On the outputs of the amp there is:

+ + - -
1 2 3 4

terminals. Internally in the amp the positives (1 and 2) are connected together and negatives (3 and 4) together. So there is no difference between hooking up in any of the configurations 13, 14, 23 or 2->4. If its a matter of style, probably use the 14 set, since they're furter apart and harder to short out that way, but electrically it doesn't matter.

Posted on Mar 17, 2011

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I'm using that Alpine right now for 2-12" subs and I have compared it to 6 or 7 other amps this month and most were 4 channel 150Watt/Channel Bridged to 300Watts x 2 and found the Alpine to be superior in both sound quality and loudness. The Alpine has also not turned off even with full volume for hours at a time, Very solid amp I was very surprised due to it's size!

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Wiring Kenwood KFC-W3003


If it's a single voice coil, it's probably 4 ohms. the sub only handles about 175w RMS, so don't expect earth shattering bass to come out of it. A single voice coil is easy. Positive from the amp to the positive post of the sub, negative from the amp to negative post of the sub. This sub sounds lots better if it's in a sealed enclosure. A ported enclosure allows too much cone movement, heating up the coils, and the sub fails prematurely. Hope this helps.

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How many watts in a Kenwood kac-9104D


Kenwood KAC-9104D

Product Features
  • Mono subwoofer amplifier
  • 500 watts RMS x 1 at 4 ohms (900 watts x 1 at 2 ohms)
  • Variable low-pass filter (50-200 Hz at 24 dB per octave)
  • Bass boost (0-18 dB at 40 Hz )
  • Subsonic filter (15/25 Hz, 18 dB/octave )

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+ + - -
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terminals. Internally in the amp the positives (1 and 2) are connected together and negatives (3 and 4) together. So there is no difference between hooking up in any of the configurations 13, 14, 23 or 2->4. If its a matter of style, probably use the 14 set, since they're furter apart and harder to short out that way, but electrically it doesn't matter.

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Hello damasogrizzl,

The 2 sets of terminals are connected internally. Having 2 sets just makes it more convenient when wiring multiple subs. The amp is rated for 900 watts RMS into a 2 ohm load. The specs claim that it is stable at 1 ohm but does not give a power rating.

The Radial SD competition series from Phoenix Gold are rated to handle up to 600 watts RMS. If you have the model RSdC124 with dual 4 ohm voice coils, it would be best to wire the voice coils in parallel for a 2 ohm load and connect the sub to one set of terminals on the amp. If your sub is the model RSdC122 with dual 2 ohm voice coils, you should wire the voice coils is series for a 4 ohm load and connect the sug to one set of terminals on the amp. Wiring the voice coils in parallel will result in a 1 ohm load. And, while the amp may be stable at 1 ohm, the sub will be seriously overpowered.

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Hello king3132,

Three 4 ohm subs can be wired parallel for a 1.34 ohm final load or series for a 12 ohm load. If you have the channels of the amp bridged, I hope that the subs are connected in series because the Sony XM-2200GTX is NOT rated for or stable at 1.34 ohms. It's only stable down to 4 ohms.

You definitely will not get the maximum potential of the subs from that amp. They can handle 400 watts RMS each (total 1,200 watts) and the amp is only capable of 500 watts RMS into 4 ohms (less at higher impedance), so each sub could only be getting a maximum of 166.6 watts RMS.

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