Amp not outputting enough voltage

[heffrey]

Hello,

I am running into problems with my amp not outputting enough voltage. I installed this setup, with the subwoofers wired in parallel, for an impedance of 1 ohm. 2 x Pioneer TS-W3003D4 12" Subwoofers + 1000W Hifonics X1000.1D Amp. I verified that the impedance is 1 ohm by using a DMM. Based on my calculations, I should set the gain so it outputs 31.62 volts (sqrt(1000x1)). I am using a 50hz test tone, head unit at 30/35, EQ flat, with the gains on my 4 channel amp for my speakers turned off. Turning the gain all the way up on the sub amp only gets to about 16.5 volts AC output.

Any idea what the problem could be??

Thanks in advance!

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[Beatin' 10+ year member]

junk LOC on a stock HU........I bet. My cousin had a same problem till he got an after market HU.

 

[heffrey]

junk LOC on a stock HU........I bet. My cousin had a same problem till he got an after market HU.

I have an aftermarket HU. This one: Kenwood KDC-348U CD receiver at Crutchfield.com

 

[T3mpest 10+ year member]

Is your subwoofer output on the deck all the way up.. What level tone are you using for your gain setting?

 

[heffrey]

Is your subwoofer output on the deck all the way up.. What level tone are you using for your gain setting?

50hz.

Update: I turned the subwoofer output to +15, and now when I read the output voltage it will go up to ~23v at about 2/3 gain, but if I turn the gain up beyond that the voltage output DECREASES...

 

[heffrey]

Which is still 8.6v less than what I'm looking for...

 

[Popwarhomie 5,000+ posts]

Because Hifonics.

 

[heffrey]

Looks like my speaker amp isn't outputting enough voltage either. Could it be a grounding issue?? Although my battery reads 12.54V, which is identical to the voltage at the amps.

 

[Beatin' 10+ year member]

Because Hifonics.

naaahhhh...........gotta be a better reason. Hifonics aint that bad.

 

[heffrey]

Might it be the head unit pre-out is too low? It's 2.5v.

 

[dragnix 5,000+ posts]

2.5v is plenty

 

[heffrey]

Any ideas what it could be then?

 

[heffrey]

Could the power and ground wire be the issue? Both are 4 gauge, and speakers and subs are total 1,240 RMS.

 

[Audio4ever 10+ year member]

12.5 with car running?

 

[heffrey]

With car off. I can check running voltage tomorrow.