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 have a Sony DAV S500 AV system and with certain DVD and with the volumn just over 20 (not really that loud), the system shuts down and PROTECT shows in the message window. I read somewhere on the web...


If the subwoofer and other speakers were included with the system, THAT is what they're designed for. Mixing and matching with other products is usually discouraged if not forbidden.

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If the problem returns with connection of the sub it may be defective or on its way out. Internal damage to the voice coil from being overdriven could have melted or worn through the insulation and it would cause intermittent undesired electrical contact or load variation under certain conditions, like high volumes.

If your speaker level settings are unusually boosted for the sub you may be overdriving it.

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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.

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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

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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

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Alpine pdx 1.600keeps cutting out


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

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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

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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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