MA2 vs Conrad Johnson ART108A
The ART108A's power @ 8ω is 160W against the MA2's 220W, its power @ 4ω 160W against 220W, and its thd 1.500% against 0.400%. Both share input impedance (100000Ω).
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AmplifiersPower AmplifiersTube Amplifiers
About the MA2
The Atma-Sphere MA-2 Mk. 3.3 is a flagship monoblock power amplifier introduced in 1990 as the largest production triode amplifier and largest production OTL in the world for nearly 12 years. The current Mk. 3.3 iteration features improved gain stage with wider bandwidth and greater transparency, switchable feedback, and automatic tube biasing. It delivers 220 watts per channel into 4, 8, or 16-ohm loads with exceptional control and impact across the full bass frequency range while retaining detail, delicacy, and speed. The amplifier is noted for superior performance with demanding speakers including Sound Lab, Wilson Audio, JM Labs, Magnaplanar, and Avalon. It features fully balanced differential design, Class-A operation, hand-wired point-to-point construction with no circuit boards, and proprietary precision components throughout. The MA-2 is renowned for its transparency, dynamic capabilities, and ability to extract fine details of instrumental and vocal performances without sonic artifacts during constant playback.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 220W @ 8Ω
- Power @ 4Ω
- 220W @ 4Ω
- Amplifier Class
- A
- Minimum Impedance
- 4Ω
- Input Sensitivity
- 2.8V RMS
- Input Impedance
- 100000Ω
Analog Output
Analog signal output specifications
- THD
- 0.400%
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Analog Inputs
- RCA, XLR
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 430 × 250 × 710 mm (W × H × D)
- Weight
- 46.7 kg (103 lbs)
Key Specifications
Power: 220W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions