SP11 MkII vs Reference Two
The Reference Two matches the SP11 MkII on thd (0.005%), output voltage (2.0V RMS), input impedance (20000Ω), and class (Tube).
AI-generated product photo — not official manufacturer imagery.
AmplifiersPre-AmplifiersTube AmplifiersDiscontinued
About the SP11 MkII
The Audio Research SP11 MKII is a highly regarded hybrid tube preamplifier released in the late 1980s, known for its fusion of triode tubes, JFETs, and MOSFETs in each active stage. It uses six 6DJ8/ECC88 tubes and offers a warm yet precise sound signature, requiring a warm-up period of 15 to 30 minutes to reach optimal performance. The preamp includes multiple inputs (phono, tuner, CD, video, spare) with selectable impedance settings for phono cartridges, and features extensive control options such as tape monitoring, mute, bypass, polarity inversion, and subsonic filtering. It has a dual chassis design with a separate power supply and provides high gain and low distortion, making it a timeless piece for audiophiles seeking both musicality and detail. The unit is typically found in excellent cosmetic and operational condition, often including Telefunken E88CC tubes and original power umbilical.
Specifications
Power Specifications
Amplification power output and characteristics
- Amplifier Class
- tube
- Input Impedance
- 20000Ω
Analog Output
Analog signal output specifications
- THD
- 0.005%
- Output Voltage
- 2.0V RMS
- Output Impedance
- 250Ω
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Analog Inputs
- RCA
- Analog Outputs
- RCA
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 482.6 × 133.35 × 260.35 mm (W × H × D)
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions