Question about Alpine PDX-1.1000 1000W x 1 Car Amplifier Car Audio Amplifier

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Amp cuts off

I have a Alpine pdx1.1000 on 2 12" db drive platinum series. when the bass hits its cuts off. If I unplug one sub it doesnt cut off and both subs work fine when I plug them in one at a time. its when both are plugged in it cuts off and comes back on. It worked fine until tonight. thanks in advance

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Re: amp cuts off

Hey there. i have a PDX 1.1000 with 2 12" Type R Subs. I had the same problem for a long time. but i upgraded my power cable from 4 gauge to 0 gauge and put another earth from the battery to the chasis. the bass hits alot harder now and rarely cuts out. except now im having the problem of the 4 25 amp fuses blowing on the amp....

Posted on Jan 17, 2009

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Re: 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.

Posted on Sep 19, 2007

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kappas are 2ohm. You are running that amp at 2ohms stereo on front and rear channels. That is a nice amp, but it is a thirsty one. If you have a sub amp as well, then you are not supplying your amps with enough power. drop down to 0 gauge and see if it heats up anymore. Also, try going high pass if you have subs. If you don't have subs. You need to run 4 gauge and make sure you have a great ground.

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Amp cutting out when bass hits

With an amp like that you can not pull enough power from you cars battery alone. That is why when it hits hard it drains the amps from your battery and you amplifier cuts out. The light on the amplifier most likely dims when the bass hits. You need to get a capacitor. They are easy to hook up on the main power wire. You can get one from or get a used one off Good luck

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My alpine pdx 1.1000 amp cuts out, the sub cuts off and the amp goes in safe mode but it does it before it even gets loud, the sub is a 2000W rms sub, why dos the amp go in to safe mode, i cant turn the...

Power is rated at 1000x1 @ 4ohm.
How many voice-coils does your speaker have? If more then one, are the coils wired in series or parallel? How many ohms are the coils? If you actuate the cone with your hand, do you hear any "scraping" sounds?
Assuming everything above is within range and or tests good, the amplifier more then likely has at least one failed output transistor. a DMM would be needed to check for shorts.

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Ok. Have you check the Ground and the Power connection.

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try to check and clean the wiring as clean as possible to avoid messing up on your connection. Check the polarity of you subs to yuor amp if you have it connected on the outher way around it would not give you a good result. check the polarity this will solve your problem. Over powering your sub will fry it easily try to tune it a 10" sub wont give you a 15" performance..

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Subs dont beat like they should

you've spent alot of money on **** by the sounds of it!!. you should only ever run multiple subs the same brand, power and resistance you can just connect any old subs to a system you need to wire them depending on the load that the amp needs to see. first thing is to try the amp/s on a individual sub to check your amps still work once done check the subs 1 by 1.

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Why does my KAC-8404 cut off at high volume bass?

amp 101

1/0 wire to the amp or the amps will loose power

check the connections mainly the negative

wiggle the wires see if you get a cut out or not

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It sounds like you either have too low of an ohm load or the voltage is dropping at the amplifier's power terminal.

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

If the voltage remains near or above 12v, disconnect one speaker and see if it shuts down. If it doesn't, disconnect that speaker and connect the other speaker. If it only shuts down with both speakers connected and the voltage is staying above 12v, the ohm load is probably too low and you'll need to rewire the speakers.

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