Mr. C
21-07-2025, 16:19
Recently added to our used inventory a really great pair of mono block amplifiers the MSB M202's genuine UK models with original boxes and paperwork, wonderfully musical and engaging. very rarely seen in the Europe let alone the UK superb amplification. Class 'A' spound withou the usual drawbacks, taught bass coupled with smooth extended highs. New cost £18K.
Asking £6495 ono
Specifications - Per amp
M-202 Amplifier
True Balanced (XLR) Input Impedance 36kOhm
Single-Ended (RCA)Input Impedance 18kOhm
Input Sensitivity:
4.34 Vpp @ 200W (High Gain +28db)
8.68 Vpp @ 200W(Low Gain +22db)
Common Mode Range:+/- 20 V
Max. Linear Input Range:10 Vpp
Max. Input Voltage:20 Vpp
Transistors:All Bi-Polar
Feedback: 0 Negative Local Feedback, 0 Negative Global Feedback
Damping Factor:80
Signal to Noise Ratio:>120 dB
Power Rating: >200 Watts at 8 Ohms, 400 watts into 4 Ohms
Capable of driving a 1 Ohm load
Static Power Consumption: 250 Watts
Filter Capacitance: 220,000 µf
Transformers: Dual 600W Toroidal Transformers.
Dimensions: 12" diameter, 18" tall, 90 LBS
Control Features:
- Switch for Balanced or Single-ended operation.
- Lighted switch for On-Standby-Off
- Switch for High and Low Bias Modes.
Not Square!
As you've probably noticed, the M-202 Amplifiers are round! This design allows us to keep the signal paths as short as possible for the best possible performance.
Truly Balanced Architecture
Both the inputs and the outputs of this Amplifier are completely Balanced. There is no funny business going on here! The M-202 also offers a single-ended input that is treated separately from the balanced input. A simple switch located near the input jacks allows you to switch the Amplifier between Single-Ended operation, Balanced (high gain, + 6dB) and Balanced (low gain).
Control Features
Based on customer requests, the M202 has both a total power on / off and standby mode all selected by the lighted toggle on top and via a remote jack on the back. It also has a high/low Bias switch allowing the Amplifier to run in a cooler mode for hot environments, and hot as a pistol for the very best sound possible, even at the expense of a high air conditioning bill.
The heart of the MSB M202 Amp is our MSB designed current mirrors. This approach is expensive but allows amazing accuracy. With such great accuracy we can even operate with zero feedback, greatly improving our phase response. Negative feedback is a trick used by most amp designers to improve linearity but its cost is in degraded phase performance. Our use of zero feedback is significant breakthrough and indicates the care taken in our design.
Other improvements include the use of toroidal transformers keep noise levels low as does the dense packaging. High quality connectors are used on the back of the unit with both balanced and single ended inputs.
Contact information (https://coherent-systems.co.uk/contact-us/)
Coherent Customer Feedback (https://www.google.com/search?client=firefox-b-d&q=coherent+systems&fbclid=IwY2xjawLTxVFleHRuA2FlbQIxMABicmlkETA1bmZuV 1hRang5VXE3MWVhAR41VgkKpeTFrwA3IRITsAzEmmeM4eG8pIS v8Vd3I4mBqsYysjxP8Ir5X7hjiw_aem_IBSRy1vB-9UenYZmTCwqxg#lrd=0x487668bff37d304f:0x7a56d571327 653fc,1)
https://coherent-systems.co.uk/wp-content/uploads/2025/07/M202b1.jpg
https://coherent-systems.co.uk/wp-content/uploads/2025/07/M202b2.jpg
Asking £6495 ono
Specifications - Per amp
M-202 Amplifier
True Balanced (XLR) Input Impedance 36kOhm
Single-Ended (RCA)Input Impedance 18kOhm
Input Sensitivity:
4.34 Vpp @ 200W (High Gain +28db)
8.68 Vpp @ 200W(Low Gain +22db)
Common Mode Range:+/- 20 V
Max. Linear Input Range:10 Vpp
Max. Input Voltage:20 Vpp
Transistors:All Bi-Polar
Feedback: 0 Negative Local Feedback, 0 Negative Global Feedback
Damping Factor:80
Signal to Noise Ratio:>120 dB
Power Rating: >200 Watts at 8 Ohms, 400 watts into 4 Ohms
Capable of driving a 1 Ohm load
Static Power Consumption: 250 Watts
Filter Capacitance: 220,000 µf
Transformers: Dual 600W Toroidal Transformers.
Dimensions: 12" diameter, 18" tall, 90 LBS
Control Features:
- Switch for Balanced or Single-ended operation.
- Lighted switch for On-Standby-Off
- Switch for High and Low Bias Modes.
Not Square!
As you've probably noticed, the M-202 Amplifiers are round! This design allows us to keep the signal paths as short as possible for the best possible performance.
Truly Balanced Architecture
Both the inputs and the outputs of this Amplifier are completely Balanced. There is no funny business going on here! The M-202 also offers a single-ended input that is treated separately from the balanced input. A simple switch located near the input jacks allows you to switch the Amplifier between Single-Ended operation, Balanced (high gain, + 6dB) and Balanced (low gain).
Control Features
Based on customer requests, the M202 has both a total power on / off and standby mode all selected by the lighted toggle on top and via a remote jack on the back. It also has a high/low Bias switch allowing the Amplifier to run in a cooler mode for hot environments, and hot as a pistol for the very best sound possible, even at the expense of a high air conditioning bill.
The heart of the MSB M202 Amp is our MSB designed current mirrors. This approach is expensive but allows amazing accuracy. With such great accuracy we can even operate with zero feedback, greatly improving our phase response. Negative feedback is a trick used by most amp designers to improve linearity but its cost is in degraded phase performance. Our use of zero feedback is significant breakthrough and indicates the care taken in our design.
Other improvements include the use of toroidal transformers keep noise levels low as does the dense packaging. High quality connectors are used on the back of the unit with both balanced and single ended inputs.
Contact information (https://coherent-systems.co.uk/contact-us/)
Coherent Customer Feedback (https://www.google.com/search?client=firefox-b-d&q=coherent+systems&fbclid=IwY2xjawLTxVFleHRuA2FlbQIxMABicmlkETA1bmZuV 1hRang5VXE3MWVhAR41VgkKpeTFrwA3IRITsAzEmmeM4eG8pIS v8Vd3I4mBqsYysjxP8Ir5X7hjiw_aem_IBSRy1vB-9UenYZmTCwqxg#lrd=0x487668bff37d304f:0x7a56d571327 653fc,1)
https://coherent-systems.co.uk/wp-content/uploads/2025/07/M202b1.jpg
https://coherent-systems.co.uk/wp-content/uploads/2025/07/M202b2.jpg