amp probs

[txred0810 10+ year member]

I have been trying to set my amp correctly for some time now. I have a JBL 300.1 and it is rated for 150 watts at 4 ohms and 300 at 2 ohms. Right now I am running two JL W0 8 ohm single VC speakers wired in series to produce a 4 ohm load. Using the tutorial this means i should set my amp channel to measure 24.5 ACvolts (sqrt of 150*4). I put in a test tone cd at -6db at 50hz for about a 2:1 ratio. turned the volume up to 26 out of 32 subwoofer level at 0 bass at 0 etc etc. I then proceeded to check the voltage and it was around 22 volts with the gain all the way up to 250mV. I can't ever get the voltage to reach anywhere near 24.5 volts. Am i doing something wrong?? I followed all the directions... im pretty sure my preouts are 4.5v so that would generally mean to barely turn the gain up since the the highest volts are 4 on my amp. Anyways im lost!! I can set it well by ear but i want it to be perfect...

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[txred0810 10+ year member]

anyone????

 

[txred0810 10+ year member]

PLEASEEEEEEEEEEEE anyone???!!!

 

[squeak9798 5,000+ posts]

The problem is that you are using a -6db test tone. You need to use a 0db test tone.

 

[txred0810 10+ year member]

i used a 0db test tone and it was the same thing... volts never got above 22..

 

[squeak9798 5,000+ posts]

What headunit do you have?

 

[txred0810 10+ year member]

kenwood excelon... KDC-X579