Question about Ultra Linear UL-4400D Car Audio Amplifier

2 Answers

The prot light on my 3200d ultra linear amp comes on and goes off and my power light will not come on what does that mean

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  • l_dunn32 Oct 17, 2010

    tryed to use a battery charger to test my 3200d ultra linear the prot light came on and went off also the power light never came on what could be my problem?

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  • Master
  • 593 Answers

The one light means, it is still hooked up to the Ign. switch and the switch is on, or it is hooked to the radio power and the radio is on. The main power has a bad connection at the battery. That is why the main power light will not come on and it will work for a little bit and go off, it has enough power to fire the capacitors and they discharge then recharge do it again. So check the connection at the battery, check that wire to the amp and then at the amp. check the amps ground at the battery and then at the amp itself. Good hunting.

Posted on Oct 17, 2010

  • Thermo King
    Thermo King Oct 17, 2010

    It could be a loose internal connection then. If you are so inclined as to open it up and just look in the area of the power bosses in front. Some models have a fuse soldered to the board in this area.

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  • Master
  • 11,896 Answers

Check that the amp ground wire is grounded inside the trunk to an unpainted surface. No paint. Scrape it off.

Posted on Oct 17, 2010

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2 Answers

When i turn on my Samsung HT-C550 IT showing PROT and DVD turn off. What this is mean PROT?


PROT means that the AMP is protecting itself from damage due to bad or incorrect wiring or damaged and or incorrect speakers. Check your wiring and speakers.
If you find no problem then, DISCONNECT YOUR SYSTEM FROM THE POWER, disconnect your speaker wires...all of them, then reconnect the power ONLY, turn on the system and see if it still says PROT. If it does then your amp is damaged.

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Re: Pyramid PS-36kx power supply buzzer sounded,red light came on


Hi! I saw your question, and maybe this will help. I also have a Texas Star 100w amp, and this same power supply. Even though the nominal draw for your equipment is way below the rated amp flow of the power supply, when you key up, and the output on the amp is at max, you are drawing the limit of your power supply! Try running this setup at a lower linear output. You don't need the full 100 watts to get out! 60-80 watts is aplenty! You should start at a low output, and slowly increase the output(while keyed up), untill the power supply starts to complain.(buzzer/light). This is what your limit will be. The only other cure, is a MUCH bigger power supply. Unfortunately, I cannot afford a 60-90 amp supply, so this is what I am forced to do to use the one we have. Also,keep your cb's output very low when using the linear amp. These amps are supposed to get a low signal from your radio, or the linear amp is overdriven. (noisy and unstable. Hope this helps you! 73's to you! jimsjinx

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It goes into protection mode


hi there
you will need to get a larger ground wire and it needs to be mounted to metal surface. this means you may have to scratch some paint in area where you will place the new ground wire (note do not add any other wires to this ground)
if that doesn't solve the problem than your settings may be to high on the amp but this sounds like a ground issue also make sure no fuses in amp are blown
hope this helps

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Marathon 2000 amp... PROT light


Ok this means the AMP is in protection mode!..most likely the cause is a short in your wireing from the speaker wires! check all wires going in and out of amp! Look for stray wires touching metal or other contacts! (If this does not fix it the short may be inside of amp!
(This has nothing to do with a fuse!)
Please rate this FREE response!
THANK YOU!

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If you run the remote from the battery you will need a on/off switch. Sounds like the amp is overheating. Also, I don't understand bridge the remote and power. They should be seperate going into the amp.

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Amp Issues


1800W peak output at 2 ohms
975W peak output at 4 ohms
600W RMS (continuous) at 2 ohms
325W RMS (continuous) at 4 ohms
Variable LP crossover adjustable 35-250Hz
4 AWG power/ground inputs and RCA pass through
Low-pass filter
Bass boost 0-18dB adjustable remote punch bass EQ
Signal-to-noise ratio: >80dB
Line-level input


It is going into protect mode for a reason.
Disconnect the subs and turn everything on again. If the light comes on, the problem is internal and will need servicing by a technician.

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