The EQ can be switched in/out by a footswitch, enabling players to go from a flat fretless sound to a boosted sound via a favourite EQ setting. A single input is switchable for passive and active instruments with a blend of solid state and dual triode tube preamps stages which can be preset and selected by footswitch, providing access to a massive range of clean, warm and overdriven tones.

Also footswitchable is the on-board compressor and the mighty Ashdown sub-harmonic generator which precisely tracks the main signal and reproduces it an octave lower. A sub-harmonic level control enables the player to add just the right amount of low-end reinforcement - everything from a subtle, thickening of the sound to unbridled, bone crushing tone. The ABM 900 EVO III features a front-panel mounted balanced DI out with pre or post EQ switching, a sub-bass output, a tuner output, an FX loop and a line input for the connection of an external sampler or sound source. Output muting cuts the signal from the DI output but leaves the tuner output 'live', allowing the player to tune up in silence. A new upgraded power section has faster transient attack, more headroom and even less noise.

Specifications:
Power Output (RMS)    575W + 575W
Power Requirement    230 / 115V
Frequency Response    -3dB at 17Hz and 30kHz
Speaker Outputs    Minimum impedance 4 Ohms
High Instrument Input    Impedance 3.9m Ohms, input range 150mV - 20mV p-p
Low Instrument Input    Impedance 10k Ohms, input range 300mV - 40V p-p
Line Input    Impedance 22k Ohms, input level 0dBu nominal
Sub Output    Impedance 1k Ohms, level 0dBu Nominal
DI Output    600 Ohms balanced, level 0dBu nominal
Tuner Output    Impedance 22k Ohms, level 0dBu nominal
EQ    Bass +/-15dB @ 45Hz
Middle +/-15dB @ 660Hz
Treble +/-15dB @ 7kHz shelving
Slider 1 +/-15dB @ 180Hz
Slider 2 +/-15dB @ 340Hz
Slider 3 +/-15dB @ 1.3kHz
Slider 4 +/-15dB @ 2.6kHz
Shape (Push Flat) +8dB @ 50Hz & 4kHz, -8dB @ 400Hz, filter slope - 6dB/octave
Effects Send    Impedance 22k Ohms, level 0dBu nominal
Effects Return    Impedance 22k Ohms, input level 0dBu Nominal
H x W x D (mm)    158 x 610 x 355
Weight (kg)    28