The M5si is a real high end amplifier. At 150wpc with high current delivery it will drive virtually any loudspeaker easily.Internally the M5si is configured as two independent monoblocs with a separate preamp but all mounted on one pcb. Its technical performance is about equal to the M6si. Musical Fidelity M5si Integrated Amplifier Highlights:150wpcExcellent technical performancePreamp outputUnconditional stability will drive any loudspeakerWide range of useful inputs including asynchronous USB and MM phonoExcellent hunky build qualityMusical Fidelity M5si Integrated Amplifier Specifications:AmplifierPower output: 150 Watts per channel into 8 OhmsTHD (+ noise):Signal to Noise Ratio: >100dB ‘A' - weightedFrequency Response: +0 –0.1dB 10Hz to 20 kHzInputs4x Line Level RCA1x USB type ‘B' connector - asynchronous data stream at up to 24-bit/96kHz1 x MM phono inputTrigger inPhono InputSensitivity: 3mV nominal (MM)Signal / noise ratio: >70dB ‘A'-weightedInput impedance: 50k Ohms (MM)Frequency response: RIAA/IEC +/ 0.5dB 20Hz-20kHzOutputsTrigger outFixed line level outputVariable preamp outputGeneralDimensions - WxHxD (mm): 440 x 100 x 405Weight (unpacked / packed): 14.6 kg/ 18.8 kg