David, That is not a problem at all. That is the way the 420 is designed. I built a couple of different prototypes and one that had 3 different volumes, one for tower, one for boat, one for sub etc...Add to that the main radio volume and it got very hard to control everything when driving the boat. So the subs are part of the volume for the in boats to make it a bit easier to operate. The sub is a bass boost control. It is tied into the in boats to separate the zones from tower zone to in boat zone with subs as part of the in boat zone. A couple of people were wanting to have just towers and subs. Which IMHO doesn't sound right anyway with no in boats at all. So try this. I think it works a lot better anyways sound wise to have a tiny bit of in boats going. Set your gains on your sub amp for you sub boost with them pounding away with very little in boat volume. Turn the in boat volume up a tiny bit, turn the knob on the bass boost all the way. Then adjust your gain on your sub amp up. So when you want towers and subs. You turn the in boats up a tiny bit and crank the sub knob. When you have the in boat volume all the way up. The subs should sound the same with the knob all the way down. It will sound a lot better this way then to just have towers blaring and sub booming to have a tiny bit of in boats going. This way people can still have a conversation in the boat with the towers up no problem but I feel it sounds much better. It is all how you adjust your system to how you like to use it. So give that a try and see what works for you. But if you swap the in boats and towers, you lose the microphone since that goes out the tower output. And if you bypass the sub control and go direct. You lose the line driver from the 420 so you will not have as much voltage going to the sub amp. Tim Wet Sounds
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