Question about Alpine PDX-4.100 Car Audio Amplifier

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Amp whine in boat

I have recently upgraded 2 amps in my boat to the pdx series. After disconnecting 2 other amps and utilizing the existing wiring, once the system was turned on while the boat motor is running I have terrible engine whine. I didn't have that with the previous brand amps. any idea what would cause this from the new amps?

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  • 149 Answers

Try isolating the rca cords away from the power cords-sometimes they pickup and transmit engine noise through the amps if they are too close together

Posted on May 27, 2009

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I just install my new setup ,i have 1 pdx f4 ,1 pdx m12 and 2 sub 10''type r and my pproblems is when i put a song the pdx f4 lights become red and my mid and tweeter cut ...


Disconnect all speaker leads from the PDXf4 - test. If the amp turns on and says on ok - then turn off, and attach one speaker lead at a time until it turns off. When it does check that speaker and the speaker wire to see if it is blown, shorted out etc.

Feb 06, 2011 | Alpine PDX-F4 Car Amp

1 Answer

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

2 Answers

What is the best way to wire two alpine SWR 1222D subs to a alpine PDX 1000 1


First off excellent choice on audio equipment, i guarantee you won't be disappointed. So your subs are dual coil 2 ohms. So wire each individual sub in series. If you don't know what this means i'll explain. On each sub there are 2 sets of wire terminals. Connect a wire from the one set's - to the other set's +. Do this on both subs and you will have the coils wired in series making each sub 4ohms. Now to hook the subs together you'll need to wire them in parallel. Now since you have your coils in series, on each sub you have one + terminal and one - terminal left. So run a wire from the + terminal remaining on each sub, and run them to your amp. Splice the ends of the two wires together and plug them into the + speaker output of the amp. Connect the two negatives in the same way and plug them into the - port on the amp. You will now have your amp running at its desired 2ohms. When wiring this disconnect the fuse on your amp power wire to avoid short problems. And if you get confused at all, and aren't sure what to do, ask again don't guess, if its done wrong you could severely damage your equipment. Hope this helped, enjoy the bass...

Sep 16, 2009 | Alpine Car Audio & Video

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...

1 Answer

2 svcs


You've pretty much hit the nail on the head. Two 2 ohm subs in parallel would give you 1 ohm, and two 2 ohm subs in series would give you 4 ohms. 1 ohm would be overloading the amp but 4 ohms is slightly "underloading" the amp.

Your best solution with the gear you have (i.e. not buying new subs or a new amp) is to put the subs in series (4 ohms). True, you'll be putting about 200W into each sub, but according to page 4 of the owner's manual for the subs, 200W is just a tad under the optimum level recommended for the sub anyway.

Jun 19, 2008 | 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

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

Alpine amp and subs questions


it will depend on how you use the 2 alpine subs,, do you know what there individual impedance is [ ohms ] and how you intend on wiring them,,,in series, in parallel, in any case you must maintain the min load in order to load the amplifier properly,,,otherwise the amplifier will operate improperly and allow DC [ direct current ] to pass and fry your subs...so what I really need is more in formation

Jul 15, 2007 | Alpine PDX-1.1000 1000W x 1 Car Amplifier...

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