(AMP-1200 models are half-width.. Whether mounting in a rack, attaching to a flat surface, or simply placing on a shelf, it's easy to combine multiple units into a single assembly.
Crestron AMP-1200-70 Single-Channel Modular Power Amplifier - 200W - 70V - 200 Hz to 20 kHz - ENERGY STAR - Black AMP-1200-70 (AMP-1200 models support Hi-Z only.