Alpine PDX1.1000 shuts off, Pushing BA spg555 2ohm sub.

[Reboot]

Hey all,

I am having some issues with my new stereo installation. My sub amp keeps cutting out and having distortion on watt spikes. I contacted Alpine and they said if the amp drops below 12v it will shutoff. I am trying to solve that issue and I am not experienced enough. I can only turn the amp to about 45gain and unit to about 25gain then the subwoofer pops and the amp cuts out. The front and rear components work just fine and clear.

My Experience

I have installed all of my stereos in the past for all my cars, I have installed stereos for friends and family as well. This is my 1st higher end installation.

My Setup

Vehicle : 2001 Ford F250 7.3 Turbo Diesel (2 Batteries)

Head Unit : Sony XAV-601BT

Amp Front/Rear : Alpine PDX F4 4x100 watt

Speaker Front/Rear : 2 Sets Boston Acoustic SR50 Components 90watt

Amp Sub : Alpine PDX 1.1000 1000watt 2/4ohm

Sub : Boston Acoustic SPG555 2ohm 1000watt

Wiring:

Power : 4gauge from battery to distribution block, 4gauge from block to both amps(12ft)

Ground : 4gauge from both amps to the bolts underneath my passenger and back seat. Both bolts and metal have been scraped clean of paint and other coatings.

Remote : Small gauge from receiver to both amps.

Inline Fuse behind the battery, power wire.

Sub Amp Speaker output is on the left channel per manual.

Sub Box : Custom build, 17x14x11

Checked Batteries they are both at 12.96volts.

Checked Batteries with truck running for altanator, both batteries sit at 14volts.

Checked Voltage at amp during bass spikes and it does drop to 11volts at 45gain amp and 25gain on unit.

So my question is, how do I stop this from cutting out and hopefully clear the distortion. I have researched the sub amp combo for months before my purchase and watched videos of them pounding on youtube but mine does not compare in sound quality or strength. From reading I am undecided if I need a bigger alternator, install a personal battery just for the amp, a capacitor(hearing bad things about this being worthless but sounds like maybe needed for the spikes).

Thank you all!!!

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[jrdnhsnbrg 10+ year member]

Check grounds, fuses, positives... Basically all electrical connections. May be a short in the box, not 100% sure.

 

[Reboot]

Not a short in the box, Its wired directly from the amp into the sub. I am checking everything though. its driving me nuts lol.

 

[NuckinFutz 10+ year member]

Is the wire from a reputable brand ? Just asking cause my JL did the same thing.

 

[CrossoverOre 10+ year member]

double check the voltage at the 4ch amp as well. I would start with doing resistance checks from the batt to the amp. My guess is there is probably an issue there. Also from the amp to where you have it grounded, could be a bad crimp, also could have the set screw for the amp smashing wire insulation instead of the wire itself. Have you upgraded the ground straps at the batt or still stock, this could be the problem. is the drop to 11v with or without the vehicle running. Does it do it with and without the truck running. What condition are the batts in? whats the reading at the batts when the problem happens. Might need to have those checked out. Just a few things to start with.

 

[Reboot]

Let me check all of that and take notes. I stopped working on it because I found diesel in my overflow. Had to make sure the drop in volts wasn't effecting my electrical system.... //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif