Consonance M100 Plus
40-watt RMS valve hi-fi amplifier with extended bandwidth and selectable output impedance, for demanding stereo listening.
Description
The Consonance M100 Plus is an integrated valve amplifier designed for stereo hi-fi use. It provides both the voltage and power amplification needed to drive a pair of speakers directly, without a separate stage.
Its output power reaches 40 watts RMS at 1 kHz, with total harmonic distortion kept below 1% at 10 watts, reflecting a comfortable margin of linearity at typical listening levels. Its frequency response extends from 6 Hz to 60 kHz (-3 dB points at 10 watts), a wide range that comfortably exceeds the audible spectrum and limits colouration at the extremes. The output impedance is selectable between 4 and 8 ohms, allowing the amplifier to be matched to different types of speakers according to their nominal impedance. A signal-to-noise ratio of 90 dB and an input sensitivity of 290 mV for an input impedance of 100k ohms round off a technical profile consistent with a valve design.
This type of amplifier is aimed at a music lover drawn to the particular sonic character of valve stages, wishing to pair the unit with speakers of suitable sensitivity in a stereo system dedicated to music listening.
Technical specifications
| Output power | 40 watts RMS 1 kHz |
| Total harmonic distortion | < 1% (10 watts, 1 kHz) |
| Frequency response | 6 Hz-60 kHz (-3 dB at 10 watts) |
| Input sensitivity | 290 mV |
| Input impedance | 100k ohms |
| Output impedance | 4, 8 ohms (user-selectable) |
| Signal to noise | 90 dB |
What to check before buying used
On a valve amplifier like this one, it is first worth checking the condition and origin of the tubes fitted: their wear directly affects the sound, and any replacement should match the original type. Checking the bias after changing valves is recommended to preserve the stated linearity. The coupling and power supply capacitors also deserve particular attention with age, as their degradation can alter the frequency response and increase background noise. Finally, testing the output impedance selectors (4/8 ohms) and the RCA inputs helps ensure no contact is faulty.
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