The preamplifier section has a single input, which is then split between the normal channel and the boost channel, these are footswitch selectable, hence the terminology ''Split Channel''. The normal' channel has volume, treble and bass controls, offering a wide range of sounds and is aimed at being the clean or rhythm channel. The 'boost' channel has an L.E.D. indicator to show selection and features gain, volume, treble, middle and bass controls. This is aimed at being the 'dirty' or lead channel and, as such, offers the player the facility of long, controllable sustain with the sound quality that has made Marshall the big name in guitar amplification.
Both channels are fed into the 'master' section that contains the footswitch-controlled Hammond reverb, presence control, effects send and return sockets, and the 'master volume' control that adjusts the apparent output power of the amplifier.
The output stage of each amplifier features either 50 watts or 100 watts of Marshall power and contains the usual Marshall items of selectable mains voltage and output impedance, fuse-holders etc., enabling the amplifier to be used world-wide with almost any loudspeaker configuration. Also on the output stage, is a frequency compensated D.I. socket and volume control to facilitate the ease of slaving or recording, yet maintaining the sound quality projected by Marshall loudspeaker systems.
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