Martin Audio introduces highly efficient, very compact power amps

Three new Martin Audio MA Series models deliver up to 95% of the input power straight into the speakers with a mere 5% loss dissipated as heat. Such advanced technology enables a considerable reduction in size and weight. One particular feature of this efficiency is that the amps are virtually independent of output level compared to conventional designs which typically achieve their best efficiency only at full rated output power. The new MA Series models utilize Pulse Width Modulation (PWM) technology to achieve higher efficiency. A PWM converter works as a high frequency sampler, converting the variable amplitude of the input signal into a digital pulse at the output. This is then converted into an analog signal with a unique, patented output filter which is how the extremely low THD and Intermodulation figures are achieved. The Switch-Mode power supply ensures the lowest possible weight and contributes to the efficiency. It incorporates Power Factor Correction that maintains a steady current draw on the mains supply. The new MA models are virtually immune to mains voltage variations and can be used directly on any worldwide mains voltage standard without adjustment. Patented design features ensure that parameters such as distortion, frequency response, slew rate, damping factor and bandwidth are at the highest possible levels. The combined efficiency and advanced PSU design means that the amplifiers have excellent current drive capability. Two-ohm loads may be driven without any compromise making a reduced amplifier count a realistic proposition for many applications. The new MA Series models also feature comprehensive DSP functionality accessed via the front panel controls and LCD display. Limiting, mains current draw, level and routing can all be controlled and the amplifier can be remotely controlled and monitored by a PC via an RS485 interface. An optional DSP card can be fitted to give additional DSP functionality thanks to on-board Sharc processing. A smart card can be used to store and load parameters between amplifiers.