Question about Phase Linear UPA424CS Car Audio Amplifier

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Phase Linear UPA424 amp Can it be Bridged?

I bought this for Subs and thought I read bridgable on the outside but no mention of bridgable on outside or in. 12 kenwood 10" older subs. All4 channels of amp available.
Can I bridge 1&2 for 1 sub and 3&4 for the other? Will it damage the amp.
Each channel has either the "+" or "-"in a circle. Are these indicaators of bridging campatable?

Thanks from a rookie!

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4 Suggested Answers

Draco
  • 2 Answers

SOURCE: Phase Linear UPA424...No sound

I had the same problem with mine but i had the 224 version first worked nice just for a small system but i just got this one today and i hooked it up to a small sub box how i had the one before and it just dosent work the other one quit beforhand and i thought it just went bad so i figgerd id buy this one but after about and hr n 1/2 of work to show nothing kinda was a depressing moment, ive gone through my wireing about 4-5 times now and drawn it out 2 times on eveything ive done im just lost, ive even tryed diffrent rca and also tryed a diffrent radio and still nothjing tryed messing aorund with settings still nothing its kinda a bummer

Posted on Jan 15, 2007

Mitco39
  • 62 Answers

SOURCE: Alpine mrp-350 amp

1) If you bridge on a non bridged amp your sound will be horrible as they sine waves comming out of the two teminals will be different... I suggest removing the bridge. 2) The gain knob is to adjust when the amp will reach its max volume with respect to the sterio;s volume. 3) the LP filter is a Low Pass filter and its purpose is to eliminate the higher frequencies that do not sound all the well when played over subwoofers.

Posted on Mar 26, 2007

  • 631 Answers

SOURCE: is it not bridgable

This amp isn't bridgeable. It's a mono amp (only one channel). You need two independent channels to bridge. Some mono amps are bridgeable if you have two identical amps but I don't think Kenwood recommends that with this amp.

Posted on Jan 28, 2008

  • 47 Answers

SOURCE: phase linear model UPA424 wire diagram

YOU WILL NEED A SOLID WIRE FROM UR DECK TO UR AMP 4 A REMOTE WIRE AND A GOOD SET OF RCA JACKS

Posted on Feb 28, 2010

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Free manual for mosfet phase linear upa424 240watt amplifier


You do have 12 volts connected to the remote connection, correct?

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Use good quality wires-- the cost is the factor for high connectivity with low resistance- You can bridge the two sub's in parallel to the 2 ohms output of the amp. Please be careful to see the likeness of polarity of the subs to the amp. or lese you will get a phase difference resulting in poor low frequncy.

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Phase linear model UPA424 wire diagram


YOU WILL NEED A SOLID WIRE FROM UR DECK TO UR AMP 4 A REMOTE WIRE AND A GOOD SET OF RCA JACKS

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I have two 1200 watt sony amps bridged red light on in one why?


If you are certain speaker isnt blown and you have correct phase wiring and so forth you have whats called a solder jump which is internal repair by dealer only! buy a new amp at dealer wholesale price here cheaper than having it repaired unless under warranty go here for wholesale pricing on almost everything audio wise:
www.godspeedaudioheaven.com

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Subwoofers


This will depend on the amplifiers capabilities.

I will give 2 different scenarios.

#1 Stereo configuration

If the amplifier supports an RMS power output close to the RMS input power of the subwoofers then run the amplifier in stereo mode. For example 150 watts RMS X 4 channels driven at 20-20khz. (If you can provide a model # for the subs and the amp your looking at I can help you further with this decision.

Wiring for this is easy and simply involves matching the connectors for 2 of the channels (Front or Rear) to each of the subwoofers.

#2 Mono Bridged mode.

If the amplifier is lower power but mono bridgable you can bridge two Pairs of channels and power each of the subwoofers this way.

Generally speaking a 2 channel bridgable amplifier will be able to at least combine the wattage of each channel into a single monural channel and in many cases its actually higher.

So you would bridge the front 2 channels into a single bridged mode for one subwoofer. and then you could bridge the read 2 channels into another bridged mono channel for your other sub woofer.

For example if you had bridgable amplifier thats 50 watts RMS X 4 you coudl very likely (Generalization based on quality of amplifier) send 150 watts RMS to each subwoofer.

Again I would need to know what amp you're refering to to provide specific wiring instructions. Many Bridging amplifiers either have a single switch that will send them to bridged mode or you would use the positive + terminal from one channel and the negative - terminal from the other channel or a combination of both.

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How to install this amp properly?


The amp is a mono amp with only one output channel so it cannot be bridged. You'll use one positive and one negative per speaker. The positive speaker terminals are connected together and the negative speaker terminals are connected together so it doesn't matter which you use for the individual speakers.

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1 Answer

Alpine mrp-350 amp


1) If you bridge on a non bridged amp your sound will be horrible as they sine waves comming out of the two teminals will be different... I suggest removing the bridge. 2) The gain knob is to adjust when the amp will reach its max volume with respect to the sterio;s volume. 3) the LP filter is a Low Pass filter and its purpose is to eliminate the higher frequencies that do not sound all the well when played over subwoofers.

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3 Answers

Phase Linear UPA424...No sound


I had the same problem with mine but i had the 224 version first worked nice just for a small system but i just got this one today and i hooked it up to a small sub box how i had the one before and it just dosent work the other one quit beforhand and i thought it just went bad so i figgerd id buy this one but after about and hr n 1/2 of work to show nothing kinda was a depressing moment, ive gone through my wireing about 4-5 times now and drawn it out 2 times on eveything ive done im just lost, ive even tryed diffrent rca and also tryed a diffrent radio and still nothjing tryed messing aorund with settings still nothing its kinda a bummer

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