**Price in USD** The Reference 80S stereo amplifier continues Audio Research’s latest design effort in creating a vacuum-tube amplifier that not only redefines ultimate music reproduction, but does it in an incredibly beautiful package. The 80S was created for the music lover who does not require the output power of its larger siblings, the Reference 160S stereo and 160M mono amplifiers. The 80S continues the design ethos, including dual GhostMeters® that float in front of four KT150 output tubes. Extruded panels, a vital part of the all-aluminum chassis, provide rigidity and beauty. POWER OUTPUT: 70 watts continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 1% at 140 watts (33 watts in Triode mode) per channel, below 0.04% at 1 watt POWER BANDWIDTH: (-3dB points) 7Hz to 68kHz FREQUENCY RESPONSE: (-3dB points at 1 watt) 0.7Hz to 94kHz INPUT SENSITIVITY: 1.4V RMS Balanced for rated output. (25.5 dB gain into 8 ohms); 0.7V RMS SE for rated output. INPUT IMPEDANCE: 300K ohms Balanced, 75K ohms Single Ended OUTPUT POLARITY: Non-inverting. Balanced input pin 2+ (IEC-268) OUTPUT TAPS: 16 ohms, 8 ohms, 4 ohms OUTPUT REGULATION: Approximately 1.0dB 16 Ohm Load to Open Circuit(Damping factor approximately 8) OVERALL NEGATIVE FEEDBACK: 15dB SLEW RATE: 10 volts/microsecond RISE TIME: 4.0 microseconds POWER REQUIREMENTS: 105-130VAC 60Hz (210-250VAC 50Hz) 420 watts at rated output, 280 watts in Triode mode, 221 watts at “idle” TUBES REQUIRED 2 matched pair KT150 (Power output V1-V4); 2 6H30 (Gain stage V5, V6) DIMENSIONS :Width 18.5” (47 cm) chassis; 19.0” (48.26 cm) faceplate, Height 10.5” (26 cm) , Depth 18.5” (47 cm) With handles & connectors: 21” (53.3 cm) WEIGHT:62 lbs. (28.2 kg) Net; 73 lbs. (32.7 kg) Shipping.
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