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Looks like Marantz and Denon (along with Pioneer) are definitely paying attention to two channel audio again!
The SA-7S1 has a massive toroidal transformer, isolated digital and analog circuits, an external clock input, and an aluminum SACD-1 mechanism.
The SA-7S2 has a copper-plated chassis to reduce magnetic interference, a choke-input power supply, fully balanced circuit design, and a low-noise toroidal power transformer.
The MA-9S2 outputs 300W into 8 ohms, is fully balanced, and also has a choke-input supply. It is claimed to produce >150A peak current.