Martin Audio MA2.8 Spécifications télécharger pdf (Page 19)

9 DESIGN FEATURES

Cooling

MARTIN AUDIO MA Series amplifiers run very cool due to a patented heat

exchanger. The bi-polar output devices are mounted directly onto a copper

heat sink thereby avoiding thermal losses normally found when using mica

washers. The heat sink is mounted horizontally in front of a pressure

chamber and the air flow is constant along the whole heat sink. When cool

air hits the geometric fins of the heatsink, turbulence is produced thereby

enabling efficient cooling. (In a conventional tunnel design the end of the

heat sink away from the fan invariably gets hotter than that directly in front of

the fan).

Light weight

The MA 2.8 switch mode amplifier has a very good power to weight ratio,

(280w/Kg) making it one of the most powerful, lightweight 2u amplifiers

available. This is achieved not only by the design of the power supply and

heatsink but also by the use of an alloy chassis making rear rack supports

unnecessary in most applications.

Switch mode power supply (SMPS)

Switch mode power supplies are the modern solution to the problems of size

and weight. However, early examples of SMPS used in power amplification

were not ground breaking and literally adopted the type of supply found in

many computers today. The MARTIN AUDIO SMPS is different in that it is

regulated.

Whilst the SMPS may sound complex it is actually very straightforward with

high reliability. The net result is good bass and fast response. Because the

supply is regulated, the power amplifier will produce the same power output

even if the AC line voltage falls by more than 20%!

Efficiency is also assured, and in the case of the MA2.8 this is especially

apparent; its power supply draws only 4kW and yet it produces 2 x 1400W.

(See figure 14).

Martin Audio – MA2.8 Power Amplifier

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Martin Audio MA2.8 Spécifications Page 19