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A1.5 Two-channel Power Amplifier

Faced with exactly the same challenges as the M1.1, the A1.5 embodies the same sophisticated, modular and scalable approach. It might be (slightly) smaller than the M1.1 and around two-thirds of its weight, but it’s still four amplifiers in one. It still offers the same adaptable, software controlled topology, adjustable input configuration and gain, user selectable global feedback ratio and cost-effective upgrade path. It offers exactly the same, incredibly short signal path, fully discrete, fully balanced and fully complementary circuit, built with the same carefully selected components to the same exacting standards. Even the casework, although shorter, has the same footprint, uses the same construction and includes the same mechanical grounding/stacking system. In fact, in every important way, the A1.5 is, quite literally, an M1.1 writ small – or, in Hollywood terms, “Honey, I shrank the amp…”.


Nominal input voltage
2.2V RMS balanced
1.1V RMS single-ended

Input impedance
94kΩ balanced
47kΩ or 300Ω single-ended

Output power
2x 150W / 8Ω, 2x 275W / 4Ω, 2x 450W / 2Ω in stereo and bi-amp modes
1x 275W / 4Ω, 1x 450W / 2Ω, 1x 700W / 1Ω in monaural mode
1x 550W / 8Ω, 1x 800W / 4Ω, 1x 1200W / 2Ω in bridged mode

DC to 450kHz (-3dB) at 1W into an 8Ω resistive load

Signal to Noise Ratio
> 115dB in stereo and bi-amp modes
> 118dB in bridged mode

Total Harmonic Distortion + Noise
< 0.1% (0% global feedback)
< 0.01% (100% global feedback)

Max power consumption

440 x 440 x 198mm (W x D x H), 47kg



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