There is no reason not to use the JL Audio 6channel amp. As a matter a fact Al Cab has been using one and pretty much swears by it. I cant recall if he has replaced it yet with a 4 channel but i doubt it even though im pushing him too LOL.

The main reason why i don't like the 6 channel amps is Power output.

You really dont need the Bow speakers to be as loud as the cabins. Also this amp is pretty big and takes a lot of room in a room limited environment.

You are also limited to 75 watts of power at 4 ohms.

You can get a lot more powerful 4 channels for the same price and run the bow speakers off 4ohms and then piggy back the cabins as 2 ohms and get a lot more power out of the amp.

Ultimately its up to you as the owner but that's why i prefer the 4channels over 6.