Features
Ø Switch mode power supply
Ø Superior sonic performance
Ø Light weight
Ø Advanced protection circuits
Ø Efficient copper cooling system
Ø Minimum load switches (MLS
tm
)
The MA2.8 power amplifier has been designed to combine reliability and high power
output with sonic excellence. Utilising an advanced switch mode power supply, the
MA2.8 yields a very high power-to-weight ratio in a lightweight, 2U package.
See MA2.8 Amplifier User's Guide for detailed operating instructions.
Cooling System
The Martin Audio MA2.8 amplifier runs very cool due to a special patented copper
cooling system. The amplifier’s bi-polar output devices are mounted directly onto a
copper heat sink (copper conducts heat twice as efficiently as aluminium) and
maximum heat dissipation is achieved by turbulent airflow over the heatsink’s
geometric fins.
The MA2.8 amplifier features two proportional speed cooling fans which take in air
from the front of the amplifier and exhaust from the rear. A horizontal pressure
chamber between the heatsink and the cooling fans ensures that there is little
difference in the operating temperatures of each output device. In contrast, a
conventional tunnel design can result in a temperature variance of up to 40° between
output devices.
Switch Mode Power Supply
The MA2.8’s switch mode power supply (SMPS) is the modern solution to the
problems of size and weight. Switch mode power supplies are not new - they are
found in computers and televisions. However, the demands of high power audio are
very different to these applications. The MA2.8 overcomes the size and weight
constraints of conventional power supplies whilst at the same time avoiding the
pitfalls of typical switch mode designs.
The low output impedance of the SMPS means that rail voltages do not sag under
heavy load conditions. Additionally, the rail capacitors are being recharged at a much
faster rate than those in a conventional power supply. The result is an exceptional fast
transient low frequency performance at all power levels. Efficiency is also
maximised. With much smaller transformers than a conventional supply, there is
much less loss due to transformer resistance and much less power wasted as heat in
the power supply.
The power amplifier will produce the same power output, even if the AC line voltage
drops by 20%.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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