Just to be clear, I would definitely need another amplifier if I'm not using DSP speakers and not another amp if I am? The first additional room I want to set-up is my bathroom as part of a renovation, so need speakers designed for a humid environment. I have already bought some Artcoustic Diablo Target speakers for this.

Trinnov Altitude 32-8-16, Meridian 271, Front: DSP7200SE, Centre: DSP7200SEHC, Rear: DSP3200, Ceiling Front & Rear: DSP320.2, Sub: Velodyne DD15+, MC200, Oppo 203, Sony VPL-VW360es, Lumagen 5348.