SD135 vs Marantz SM-11S1
The SM-11S1's power @ 8ω is 110W against the SD135's 130W, its power @ 4ω 220W against 230W, and its signal-to-noise 101 dB against 116 dB. Both share damping factor (>100).
AI-generated product photo — not official manufacturer imagery.
AmplifiersPower AmplifiersDiscontinued
Estimated price (community-sourced)
$5,600
Around — community and catalog average, updates slowly
About the SD135
The Audio Research SD-135 is a solid-state power amplifier known for its fast response time, explosive dynamics, and ability to drive a wide range of speaker types, including difficult low impedance models. It delivers 130 watts per channel into 8 ohms and 230 watts per channel into 4 ohms. The frequency response is exceptionally wide, from 0.4 Hz to 300 kHz, providing deep, controlled bass and detailed, transparent sound with a very low noise floor. The amplifier features protection circuitry that mutes output in case of DC at inputs or shorted outputs, ensuring speaker safety. It is cooled by a quiet 12V DC fan and comes with a high-quality detachable IEC power cord. The front panel is anodized and available in natural or black finish, with removable handles for flexible installation. The SD-135 pairs well with Audio Research preamplifiers to produce an immense soundstage and refined musical presentation. It is regarded as one of the best sounding solid-state amps Audio Research has made, combining high definition and musicality in a compact package.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 130W @ 8Ω
- Power @ 4Ω
- 230W @ 4Ω
- Damping Factor
- >100
- Minimum Impedance
- 4Ω
- Input Sensitivity
- 3.2V RMS
- Input Impedance
- 300Ω
Analog Output
Analog signal output specifications
- SNR
- 116 dB
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 483 × 159 × 381 mm (W × H × D)
- Weight
- 19.5 kg (43 lbs)
- Available Colors
- Anodized natural, Black
Key Specifications
Power: 130W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions