Sask -

Nothing wrong with the way your talking about doing it, but let me give you a few things to think about down the road.

The 800.4 that your speaking about is discontinued and I'm fairly certain we sold off the last of that model. It's been replaced by the XM15.4 model. If you do go with the SXT9 pair, you could run it in stereo mode and deliver 150x4 CEA rated power. You'd run ch 1-2 on the tower and then you'd have ch 3-4 to power either cabins or a sub. If you summed 3+4 to the sub, you'd have 300 watts.

The other option is to run the Javelin in the cabin / sub. This would give you 120x4 CEA for the cabin and 800W for the sub. As a side note: you could opt to keep the factory cabin amp in play and dedicate the javelin to the TOWER and SUB by bridging ch 1+2 and 3+4.

The point of this is to let you know - You have options. The Javelin will be most flexible but cost more. Hit me up in a PM if you need in-depth info. Happy to help.

-Brian