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The Sapphire FBA-800 is a stereo, pure class A power amplifier. The FBA-800 gets its prefix because it is a ‘Floating Bridge Amplifier’. The floating bridge design combines four 20 Watt amplifiers in a single stereo chassis and provides several key benefits. Each channel consists of two amplifiers working as voltage amplifiers driving an output stage of bridged power transistors. The advantages are a low noise floor, better power output relative to the voltage rails (x2) and with the fixed current of the class A mode, low output impedance and better load tolerance.
The Power amplifier is DC coupled, with a servo lock, and features a full DC protection circuit. This circuit is statically switched using extremely low impedance MOSFET switching devices. This circuit also acts as a soft-start switch. The FBA-800’s power supply is a low impedance design with a single custom made bi-filar wound transformer with four separate windings. Its main smoothing capacitors for the output stage are specially developed for professional audio applications with excellent ripple characteristics and long life. These ultimately feed to the four power transistors per channel in the output stages. These are multi emitter devices with an output capability of 26 amps per device. The FBA-800 operates in the full balanced mode from the input of the unit to the output. Specifications: (2) Inputs: 1 x unbalanced (RCA) and 1 x balanced (XLR). Outputs: Stereo pair multi-way locking binding posts. Front Panel Gain Selector: 6dB input attenuation. Front Panel Input Selector: RCA or XLR. Input Sensitivity: 735mV for full output. Power Output: 40 Watts into 8 Ohms both channels working. Frequency Response: 0dB 20Hz–80kHz. Signal to Noise: >96dB. Distortion at 1 Watt 1kHz: >0.05%. Remarks: a) No original packaging. b) Two minor dents on the top panel and some scratches on the right side panel.
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