Kicker KX700.5 poor audio output in all channels

Is the rail voltage steady for all channels?
yes
What is the rail voltage for the 4 full range channels?
+/- 29.72v
Rail voltage for the sub channel?
+/- 53.33v
At what ACV do the 4 full range channels clip?
1.98 ACV With load 4 ohm each channel . tone 60hz channel amp 1 L
2.01 ACV With load 4 ohm each channel . tone 60hz channel amp 1 R
0.54 ACV With load 4 ohm each channel . tone 60hz channel amp 2 L
2.24 ACV With load 4 ohm each channel . tone 60hz channel amp 2 R

1.48 ACV Without load 4 ohm each channel . tone 60hz channel amp 1 L
2.05 ACV Without load 4 ohm each channel . tone 60hz channel amp 1 R
0.34 ACV Without load 4 ohm each channel . tone 60hz channel amp 2 L
2.46 ACV Without load 4 ohm each channel . tone 60hz channel amp 2 R
ACV for the sub channel at clipping?
0.839 ACV With load 2 ohm tone 60hz
1.01 ACV without load

I have signal problems on channel amp 2 L
I will check the gain adjustment potentiometer