The three main microphone/instrument input channels include a gain control for input sensitivity regulation and three-band EQ, with parametric mids on input channels 1 and 3 and a switchable resonance (notch) filter (240Hz/150Hz) on channel 2. Phantom power is supplied for condenser and electrostatic microphones. Each of these channels also features an overload LED. Channel 1 is additionally equipped with a phase reverse switch to prevent feedback, or unwanted effects between the various channels.
JAM’s Master Section controls include a new adjustable DI out, a new mute button, a line out enabling the connection of external systems, a digital reverb and an insert for connecting an external dynamics processor. An aux out (on channel 1) offers additional connectivity to other systems. A low cut filter (cutting frequencies below 180Hz) can be used with instruments that generate aggressive low frequencies. This also enables a separate subwoofer to be connected without causing any damage to the amplifier. JAM is additionally equipped with a high voltage CLASS-A preamp that has no integrated circuits and No Negative Feedback (NFB).
A choice of wood or anthracite grey finishes is available. Models with the wood finish have a textile front speaker cover. This makes them well suited to normal domestic/home/club use, where they can integrate with a range of interiors or design stages in live music clubs. Models with the anthracite grey finish are equipped with a metal front grille. These have been designed for more robust stage and road use, where there is greater exposure to daily wear and tear or to potential damage during transportation.