FM711

About the FM711

The FM Acoustics FM-711 is a precision stereo power amplifier designed for audiophile and professional applications. It features a unique full discrete Class A design with no overall feedback and a discrete Class A balanced input stage providing superior common-mode rejection of 90 dB or more. The amplifier delivers 260 watts per channel into 8Ω with a frequency response from 1 Hz to 60 kHz and total harmonic distortion of only 0.005%. The design includes carefully selected transistors tested under dynamic conditions, hermetically sealed ceramic housings for output devices, and a pure Class A operation before the driver stage with enhanced Class AB output stage. It incorporates advanced protection circuits that monitor output current, voltage, temperature, and bias at 20 times per second, allowing immediate shutdown in case of faults such as DC offset, high-frequency oscillations, or short circuits without using fuses or compression circuits, thus preserving audio quality. The amplifier supports balanced XLR inputs and automatically balances unbalanced sources at the input. Its chassis is designed to avoid ground loops by connecting the chassis only to power ground, not audio ground. Dimensions are 430 x 200 x 450 mm with a weight of 25 kg. The FM-711 is known for its long-term reliability, low noise floor, and exceptional resolution, making it suitable for high-end home audio and studio use.