The M5si is a true high-end amplifier. At 150wpc and high current delivery, it will drive virtually any loudspeaker with ease. Internally the M5si is configured as two independent monoblocks with a separate preamp, but all mounted on one pcb. Its technical performance is about equal to the M6si. The M5si in brief:

• 150wpc
• Excellent technical performance
• Preamp output
• Unconditional stability, will drive any loudspeaker
• Wide range of useful inputs including asynchronous USB and MM phono
• Excellent sturdy build quality

M5si - Specifications Amplifier

• Power output: 150 Watts per channel into 8 Ohms
• Signal to Noise Ratio: >100dB ‘A’ - weighted
• Frequency Response: +0, –0.1dB, 10Hz to 20 kHz Inputs
• 4x Line Level RCA
• 1x USB type ‘B’ connector - asynchronous data stream at up to 24-bit/96kHz
• 1 x MM phono input
• Trigger in Phono Input
• Sensitivity: 3mV nominal (MM)
• Signal / noise ratio: >70dB ‘A’-weighted
• Input impedance: 50k Ohms (MM)
• Frequency response: RIAA/IEC ±0.5dB 20Hz-20kHz Outputs
• Trigger out
• Fixed, line level output
• Variable, preamp output General
• Dimensions - WxHxD (mm): 440 x 100 x 405
• Weight (unpacked / packed): 14.6 kg/ 18.8 kg.

Musical Fidelity is my personal amplifier brand of choice. I use the smaller M3si with my Image 414 speakers in a 10 x 6 metre room and it performs flawlessly.

As the buyer, you will also receive $400 of Supra Rhondo 4x2.5 bi-wire terminated cable to ensure your own system performs at its optimum.