Thanks Guys!
Well I experimented today, this may help some or others probably already knew it.
1.With the car on, I got like 4-5 volts higher reading than with the car off. Is this how you set it?
2.For the 6 channel amp, it only gave me a reading with internal switch set to internal ( using the rear low signal to convert it to a 5th channel for bass). No reading with ext set despite everything is off and my HU will use externals since it is a 6 ch, 5 volt RCA HU. Is this the typical case?
In either case I tried to use 3/4 volume to set the voltage. Either my amp is under rated and puts out double the power or who knows at 15 volume my fronts rated at 80 watts were clipping or popping. I mentioned I set the voltage with the volume at max (50) and 30 volume gave me chest pounding bass, no clipping, using 50HZ -10 db sinewave and a 1k hz for the fronts and rears (I don't think it makes a big difference because it measured the same voltage with both tracks 50 and 1k Hz although they recommend the 1K hz track)
I even played a CD with loud low bass ( same cd tested once speakers and sub was hooked up), and after setting the target voltage of 30V for the Sub at 3/4, in fact I went to like 80% on the volume. When playing the CD it read up to 50 Volts peaks, once I saw that I lowered the sub amp gain to 43 V max at high peaks even though the voltage remained way over the 30Volts target set with the 50Hz -10db signal. The Sub was not even noticeable, probably because I need to increase its volume and maybe I lowered the gains based on the CD signal.
I did everything right, EQ flat, crossovers off on the HU, loudness off. I guess my issue has to do with the amp being way under rated.
Any thoughts other than I am going to have to go back and set the gains with volume at max level to be where I was before? is that -10 db sinewave responsible for having to set it with the volume at max instead of 75%?
Sad thing is when I set the gains on the full range channels the first time, I calculated it on the power rating of just one channel, I was supposed to do the total power of the 2 channels, I did 60X4=240 square root =15.5 volts, when it was supposed to be 21.5 volt based on 120W. Even like that gains set at max volume at 60% volume it was loud, now at 21 volts at just over 20 it is going to sound as loud as before.
Thanks