Question about Alpine PDX-4.100 Car Audio Amplifier

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Amp will play at low volumn but not when turned up

I have a PDX-4.1 that has been working great for a year or so. Now, however, when the unit is turned on at low volumn it plays fine, but when the volumn is turned up the output stops. The amp stays on and does not go into protect, but no sound comes out of the speakers. You can turn the unit off and then back on and it will work again at low volumn. Checked all wiring and it's good. Is this an internal problem within the amp that can be repaired?

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  • 170 Answers

Probably.
almost sounds like your speakers are worn out, and when you turn the volume up, they clip n no sound comes out.

Posted on Jul 31, 2010

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Posted on Jan 02, 2017

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I just bought a Behringer K3000FX amp and it sounds GREAT with my keyboard. However, just bought a Shure SM48S voice mic and it just doesn't come thru the amp with much volumn...have to turn amp


Greetings! Ok, your amp has an XLR (3-prong) Low-Impedance input on Channel 1 for a Mic. All the other inputs are 1/4" High Impedance inputs, which are for instruments and/or other High Impedance items including low quality High Impedance Microphones. The SM48S is a high quality Low Impedance microphone, so if you use it with a 1/4" plug, it will be in a High Impedance channel, and will be very LOW in volume in comparison with everything else. So, you must use an XLR (3 prong) cable from the Mic to the Channel 1 input on your amp. That will do the trick. Good Luck with your new amp and Mic!

Dec 02, 2017 | Behringer Ultratone K3000fx 300w Keyboard...

1 Answer

PDX-5 is installed on 01 Honda Goldwing. Inputs from OEM radio are routed through adjustable converter to provide pre-amp signal. System connected to 4 speakers & 8" passive Bazooka tube. System plays...


it sounds like there might not be enough voltage to the amp check that first. If the voltage is lower than 12 volts when you get to that point then you need a stronger battery or a second battery.

Jul 22, 2010 | Alpine PDX-5 Car Amp

1 Answer

PDX 1.1000 amp overheating?


Hello thefatman69e,

The Alpine PDX-1.1000 is a physically small amp to produce the power that it does. The result is that it has less physical area for heat to dissipate. Running at or near it's maximum output into a 2 ohm load, it needs some serious airflow to keep it cooled down. I'd look for some way to get more air to it.

Hope this helps.

Sep 21, 2009 | Alpine PDX-1.1000 1000W x 1 Car Amplifier...

1 Answer

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...


ALL THAT IS NOT YOUR PROBLEM CHECK ALL YOU POWER SOURCE AND IF ALL OK CHECK TO SEE IF ANY SPEAKER IS BAD OR GROUNDING OUT'' THE CAN COURSE THAT TO HAPPEN AND CHECK MAKE SURE RCA IS NOT PINCH ANY WHERE

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

1 Answer

Alpine pdx 1.000 keeps cutting out


You are going to want to make sure all your power wires and grounds are 4 gauge as well as the wire leads to and from the capacitor-4 gauge also. make sure you have a very good ground - the power wire from the battery should hit a distribution block-from the dist. block a 4 gauge should go to the capacitor another 4 gauge to the mono amp and another to the 4 channel amp -every component should have a good solid ground even if you have to bust out a grinder and a drill and some self tapping sheet metal screws and go nuts on it- see if that helps you

May 26, 2009 | Alpine PDX-1.600 Car Audio Amplifier

1 Answer

Alpine pdx 1.600keeps cutting out


you need more batt, more amps, try new batt, capacitors are paperweights, spend on good batt.

May 14, 2009 | Alpine PDX-1.600 Car Audio Amplifier

1 Answer

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

Amp cuts off


You may have a problem with the power source feeding the amp. You need to check the voltage across the amplifier's B+ and ground terminals when the amp is playing/cutting off. If it's dropping below ~11 volts, you need to determine why it's dropping so low.

Sep 18, 2007 | Alpine PDX-1.1000 1000W x 1 Car 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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