Marshall AS50D Pojačalo za akustičnu gitaru The simple fact is that many clubs and coffee houses have seriously inadequate sound systems or none at all. For solo gigs and moderate-sized shows, the Marshall AS50D acoustic amplifier is all you need. The AS50D gives you both a highly flexible guitar input, plus a quality microphone preamplifier. And with 50-watts of full-range amplification, the AS50D can easily cover most midsize rooms.