Question about Alpine PDX-4.100 Car Audio Amplifier

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Amp going into protect mode

I have an alpine pdx.100 running 2 type x component speakers in rear deck and two 6 1/2 type rs in my kick panels. whenever i turn them up loud the amp kicks off. if the gain is too high will this make it go into protect mode. I have alreafdy changed my alternator and voltage regulator. any help?

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Re: amp going into protect mode

If you set the gain too high on the AMP, at loud volume levels some clipping or distortion of the output signal will occur. Most amps have a Circuit inside that detects this clipping or distortion and applies protection to prevent damage to the speakers and the amp. It would help to know if you are driving the speakers with a Line level output or using the speaker output from your deck. There are many things that can cause an amp to go into protect mode, and knowing a little more about your setup will help to solve the problem.

Posted on Nov 09, 2007

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How do you bridge an Alpine PDX amp

you have 2 + and 2- right? twine both speaker wires together. like + to + and - to - and then pick only 1+ and 1- to hook up and then you should double the power to the speakers only

Mar 20, 2010 | Alpine PDX-4.100 Car Audio Amplifier

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I have a alpine pdx 1.1000 and it is in protect mode so i disconnected it i started to hook it back up and put power to it and it gose right to protect mode anyway to get it out of protect mode

The most likely suspect would be an internal fault on the Alpine PDX-1.1000. So other than verify the 2 ohms per speaker using a continuity tester (DVM / VOM), all others involve opening the Alpine amp to effect repairs.
Options then are: to consider a DIY (do-it-yourself) repair if and only if you're very familiar with electronic components & circuitry, use of a DVM/VOM and a soldering iron/station.
Access to a Service Manual or at the very least, a schematic diagram would be a necessity (although a challenge in itself) as detailed procedures, test points diagnosis flowchart would be outlined though should you be uncomfortable with a DIY, perhaps your best bet would then be to seek the services of an authorized Alpine Service Center (specially if still under warranty) or a qualified professional.
Now referring to

"1. Does your amp have a high input port? This is where instead of RCA's you feed it speaker output from your head unit?
2 If so try this and see if the magic happens.. If it doesn't your screwed and the problem is internal most likely in the input stage and that's why your having to "fool" the amp.
3. Also take off the remote turn on wire and make a short little jumper from the remote turn on to the B+ on the amp. Yeah the amp will blaze on but see if it changes the output."

Oct 15, 2009 | Alpine PDX-1.1000 1000W x 1 Car Amplifier...

1 Answer

My alpine clips out at high volume I took the subs out and hooked um up outside of the car and it was working fine. do I just have a short in a ire or is this the pdx 1000 safe mode. How can I get it fixed

Go to they have a woolfer wiring wizard that can help you make sure your amp is under the correct ohm load, if your woolfers are wiring up on a 1 ohm stable load the amp will overheat and go into protection mode and cut out.. Need the woolfers on a 2 or 4 ohm stable load, and the amp should run fine with a capacitor, and some good 0 to 2 guage cable, plus a good battery and alternator to feed it

Oct 09, 2009 | Alpine PDX-1.1000 1000W x 1 Car Amplifier...

1 Answer

I have 2 6x9 speakers up front 4 6 1/2 3-ways

Hello rjmiller4039,

Although amps with 5 channels are pretty rare, you can get one. Alpine, Boston Acoustics, Infinity, JL audio, MTX, and Polk all have 5-channels ranging in price from around $350 up to around $1,000. The Alpine PDX-5 will output 75X4 watts RMS for the front and rear stereo channels and 300 watts to the mono sub channel. It is priced at $599.99 at Crutchfield.

Hope this helps.

Sep 18, 2009 | Jl Audio 500/1 Car Audio Amplifier

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Pdx 4.150 amp suddenly cuts all sound from the amp when music is played loud/normal for me, unknown reason it just started doing it, I didnt change or add anything to cause this issue. All power and ground...


Aug 05, 2009 | Alpine PDX-4.150 150W x 4 Car Amplifier...

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Alpine PDX 1.1000 low power output - sub not loud

system not configurate properly go to a pro and let them do for you you have good equipment just need to put together rite.for wht you have you can get better sound than that,,good luck

Mar 30, 2009 | Alpine PDX-1.1000 1000W x 1 Car Amplifier...

2 Answers

Alpine pdx-1.1000

what is happening is the amp can draw the current. u need a capacitor

Apr 11, 2008 | Alpine PDX-1.1000 1000W x 1 Car Amplifier...

2 Answers

PDX 4.100 In Protect Mode..

According to the manual, the issue could be:
  • Internal issue with the amp circuitry.
  • A short on the speaker output(s).
  • Power source voltage is too high (aka above 14.5V).
  • Overheating.
The easiest thing to do is to try removing the connections to the speakers at the amp and see if the issue disappears after each set has been disconnected. Keep removing wires until both LEDs stay blue.

Mar 15, 2008 | Alpine PDX-4.100 Car Audio Amplifier

1 Answer

Blown fuses

This is a sign the you have poor voltage regulation. Which may mean that you are taxing the electrical system of your vehicle. I would suggest you adding a secondary electrical supply for you audio system. This can be done by adding an extra alternator and voltage regulator and battery supply. This will allow you to drive your audio system without having it (power supply) split between the vehicle and the audio system. The fact is your system is drawing to much current for the unit and your vehicle. You are blowing the 20-amp fuses which means the the amp is creating a currnet draw which is past the rated value of the fuses, which if done too many times could damage the power amp components in the unit. I would also check the ohmage reating on the speakers connect to the unit since you may have the wrong impedance which may also cause excessive current draw and actuate some sort of overcurrent protection.

Aug 31, 2007 | Alpine PDX-1.1000 1000W x 1 Car Amplifier...

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