Not everyone knows, that Marten developed their own mono power amplifiers to match the performance of their speakers…
Marten writes: “In our search for perfection, for the optimum sound for our speakers, we reached the logical conclusion: the need for our own, technically groundbreaking and musically exceptional power amplifier.

M•Amp Mono Power Amplifier is a joint venture between Leif Olofsson, chief designer of Marten, and Patrik Bostrom, founder of the design house Anaview AB in Sweden, now CTO of Abletec A/S. He developed a revolutionary new loop linearization technology called AMS (Adaptive Modulation Servo) that M•Amp is based on.
Using our revolutionary AMS technology, the M•Amp delivers a powerful, transparent, musical sound utterly free from distortion.
AMS (Adaptive Modulation Servo) was invented by Patrik Bostrom, founder of the design house Anaview AB in Sweden. The core of the Marten amplifier is an inverting globally self oscillating class d stage. This class d stage is a load independent wide bandwidth (-3dB @ 120 kHz) first order modulator, switching at 600 kHz, with a constant loop gain of 30dB all the way up to the switching frequency. The result is a true delay line, which displays very wide bandwidth and fast transient response.

The AMS is connected to the positive and negative inputs of the core amplifiers modulation stage, acting to eliminate the imperfections of the modulation. The gain of the core amplifier cannot be affected by the servo so the wide bandwidth first order behavior of the class d modulator is perfectly preserved. The servo has the flat 20dB gain up to 20 kHz, creating a constant linearity in the audio band.
To ensure no compromise to excellence is made, two independent channels are used in a balanced configuration.The result? A truly exceptional amplifier with a very wide bandwidth, ultra low noise/distortion, high output power and very low losses.
We set out to create the perfect companion for our loudspeakers. With the M•Amp we exceeded our ambitions.”
Max Power @ 8 Ohm, 1% THD / 550 W
Max Power @ 4 Ohm, 1% THD / 1000 W
Max Power @ 2 Ohm, 1% THD / 1700 W
THD @ 1 W, 8 Ohm, 20-20000 Hz / 0.0012%
THD @ 10 W, 8 Ohm, 20-20000 Hz / 0.002%
THD @ 100 W, 8 Ohm, 20-20000 Hz / 0.006%
THD @ 300 W, 8 Ohm, 20-20000 Hz / 0.02%
THD @ 400 W, 8 Ohm, 20-20000 Hz / 0.05%
Unweighted noise / ←uVrms
Output impedance, 20-20000 Hz / ←30 mOhm
Frequency response 20-20000 Hz / +0, -0.05 dB
Frequency response DC-120000 Hz / +0, -3 dB
Power supply
Transformer / 2 KVA
Electrolytic capacity / 190000 uF
Dimension WxHxD / 370 x 270 x 530 mm (14.5 x 10.6 x 20.9”)
Net weight / 47 Kg