The room situation it isn't great but I think you'll still be pleased with your results. I'd rather see the cabinets flush with the walls, but this is a common issue and it doesn't reduce the bass too much.Do make sure that the ducts do not rattle though - That's always an irritation. When you saturate the house with bass, you'll be surprised how many things begin to vibrate. Cabinets in the kitchen. The flush knob on the toilet. All kinds of stuff comes unglued. So you might do some rap tests on your heater ducts and see if they're gonna buzz, 'cause they'll be exposed to a lot of energy.