SD135 Solid-State Power Amplifier

The SD135 is an amplifier with amazingly fast response time, explosive dynamics and plenty of current delivery for a wide range of speaker types including difficult, low impedance models.

The SD135 is an entirely new amplifier for Audio Research involving a new mix of discrete devices within the framework of a pure analog, solid-state design.

Rear Panel View: SD135 Solid-State Power Amplifier
POWER OUTPUT: 130 watts per channel into 8 ohms from 20Hz to 20kHz. 230 watts per channel into 4 ohms.
FREQUENCY RESPONSE: (-3dB points at 1 watt) 0.4Hz to 300 kHz.
INPUT SENSITIVITY: 3.2V RMS BAL for rated output. (20 dB Bal gain into 8 ohms.)
INPUT IMPEDANCE: 300K ohms Balanced, 150k ohms SE.
OUTPUT POLARITY: Non-inverting. Balanced input pin 2+ (IEC-268).
OUTPUT REGULATION: Approximately 0.05dB 8 ohm load to open circuit (Damping factor approximately 170).
OUTPUT CURRENT: 60 Amps Peak (1 millisecond)
HUM & NOISE: Less than 0.05mV RMS -116dB below rated output (IHF weighted, input shorted).
POWER REQUIREMENTS: 105-125VAC 60Hz (210-250VAC 50 Hz) 500 watts at rated output (130 WPC 8 ohms) 600 watts max, 150 watts idle.
DIMENSIONS: 19" (48.3 cm) W x 6.25" (15.9 cm) H x 15" (38.1 cm) D. Handles extend 1.5" (3.8 cm) forward.
WEIGHT: 42.8 lbs. (19.5 kg) Net; 55.3 lbs. (25.2 kg) Shipping.