musical fidelity m5siM5si is a truly high end amplifier with 2 x 150 watts into 8 ohms. It can deliver plenty of current and can therefore drive virtually virtually any speaker without problems. Internally, the M5si is configured as two independent monoblocks with a separate preamplifier, but all mounted on one pcb. Its technical performance is roughly equivalent to the M6si. It plays with great authority, has a large soundstage both in width and depth and maintains full