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The Amplifier
The M1 is a full complementary symmetry bipolar implementation and contains no coupling capacitors in the forward direction. It employs the latest technology in wide band output devices with enhanced low level linearity. Proper stage-to-stage impedance matching insures extraordinarily low distortion and a unique successive stage to output confluence provides a seamless combination of micro/nano-resolution from forward stages and robust controlled power and authority from successive stages. This unified current summation drive stage network eliminates the crossover notch problems common in many solid state amplifier designs. High idle current or class A bias output stage operation is not necessary! The M1 runs cool under most listening conditions and provides a live presentation with none of the hardness normally associated with solid state amplifiers. The output network of this amplifier is resonance free and remains stable even with a 1 micro-Farad capacitor connected across the output terminals. The M1 engenders the fine resolution and liquidity normally associated with tube amplification plus the power and bass control of solid state. Individual voices remain distinct and clear amidst the crescendo full orchestra and chorus. The sound of the M1 is pure and true to the source. It has the clarity, focus in time, and natural sound inherent in all Herron Audio products.
DC Response
The M1 incorporates automatic low level d.c. offset cancellation plus high level d.c. shutdown speaker protection circuits. The effects of continuous low level d.c. at the input of the M1 will be nulled out over time and higher levels of d.c. at the input will engage the shutdown protection.
Break-in time
The M1 has been equipped with an auto-break-in circuit that runs the bias of the amplifier at an increased level just after the unit has been turned on. Operation of this feature in indicated by two orange lights (visible through the top of the unit). The unit will remain in the auto-break-in mode until the heat sink temperature has reached approximately 124 degrees Fahrenheit. The length of time that this takes will vary from a few minutes to several minutes depending on several variables including: room temperature, unit temperature, line voltage, etc.. The auto-break-in mode can be manually initiated or interrupted by pushing the red button located near the red output connector on the back of the unit. The use of the auto-break-in will help accelerate the break-in process and warm up the amplifier during normal use.
The M1 has an oversized toroidal transformer capable of supplying enough current to power two amplifiers with the ratings of the M1. This transformer is designed to have low losses and will run cool under all operating conditions.
Specifications
Configuration Single-channel (monaural)
Frequency response 20 Hz to 20 kHz ±0.1 dB
Output Power 150 watts @ 8 ohms, 275 watts @ 4 ohms (measurements at 1 khz)
Gain 24 db
Input impedance 220k Ohms
Absolute polarity Non-inverting
Power Requirements 100, 120, 230, 240 VAC. 50/60 Hz. Standard IEC power connector. Toroidal transformer taps internally selected for appropriate voltage
Dimensions 19" wide x 4" high x 10.5" deep
Warranty 3 years, parts and labor
