My H/U sub level goes from -7..00..+7. When setting the gain on the amp should the sub level be at 00 or -7 I set it with the sub level at 00 and the gain knob is at about 11:00. It is very sensitive just touch it and it increases volume alot. Back it down and it looses sensitivity. The manual says the rca outs are 2v 5v max. Am i close?