Ashdown Engineering

ABM-1200-EVO IV Head

Unleash the Power of Bass with the ABM 1200 EVO IV!
Massive 1200W Power: Whether you're on the biggest stages or in the studio, this amp delivers a gut-rumbling bass experience that commands attention.
Trusted by the Pros: Countless renowned bassists worldwide rely on the Ashdown ABM series for its real bass tone, versatility, and tour-proven reliability.
9-Band EQ: Tailor your sound with precision using the sophisticated 9-band EQ, featuring sliders for precise cut and boost across multiple frequencies. Transition effortlessly from a clean, fretless sound to your favorite EQ settings with a footswitch.
Variable Valve Drive: Take your bass from pristine clean to full-blown overdrive with the upgraded Variable Valve Drive preamp. Dial in your desired sound and switch it in and out via footswitch.
  One Knob Compressor: Achieve a powerful, even sound with the easy-to-use One Knob Dynamic Compressor. Your bass will fill out any mix with rich, controlled tones.
Professional Connectivity: Stay connected with a tuner output, Line out, transparent FX loop, and a Line Input for external samplers or sound sources. Output muting allows silent tuning.
Flexible Partnering Options: The ABM 1200 EVO IV can power a variety of setups, from single 8 ohm cabinets to pairs of 4 or 8 ohm cabinets. Versatility at its finest!
Footswitch Compatibility: Paired with the FS-4 footswitch (not included), this amp offers on-the-fly tonal adjustments, including Valve Drive, Compression, EQ, and Sub-Harmonic Generation.
Upgrade your bass game with the ABM 1200 EVO IV. Unleash unparalleled power and tonal versatility. Elevate your bass playing to the next level!
Please Note:
Direct purchases NOT available in the United States
Find your local Ashdown Dealer HERE
ABM Head & Cab Video
Watch the ABM head and Cabs being put through their paces. For the best possible experience make sure you listen using headphones or quality speakers...


  • Power Output - 600 + 600 Watts
  • Power Requirements - 115-230 Volts
  • Speaker Outputs - 4 x Jack/Speakon outputs
  • Frequency Response - -3dB @ 17Hz und 30KHz
  • High Instrument Input - Impedance 3.9m Ohms, input range 150mV
  • Low Instrument Input - Impedance 10k Ohms, input range 300mV - 40V p-p
  • Line Input - Impedance 22k Ohms, input level 0dBu nominal
  • DI Output - 600 Ohm balanced, Level 0dBu nominal

  • Tuner Output - Impedance 22k Ohms, Level 0dBu nominal
  • Impedance - Minimum 4 Ohms Per Side
  • Effects Send - Impedance 22k Ohm, Level 0dBu nominal
  • Effects Return - Impedance 22k Ohms, Input Level 0dBu Nominal
  • Preamp Tubes - 1 x 12AX7
  • H x W x D (mm) - 174 x 645 x 357
  • Weight - 18.6

Ashdown ABM 1200 close up with VU meter, bass and input controls
Variable Valve Drive Plus – from zero to rock hero!
Our Variable Valve Drive preamp section has also been upgraded in EVO IV. Delivering more current to the 12AX7 tube enables more drive and harmonic content than ever before, enabling players to dial in a sound from pristine clean, to the fattest, fullest bass overdrive currently available. The Drive level can be preset and kicked in and out via footswitch, providing access to a huge range of clean, warm and overdriven tones.
abm 1200 evo iv head eq controls
The best EQ in the business, just got better!
Bassists plugging into EVO IV will be greeted straight away by the flickering of the new Input VU meter, allowing them to quickly find the sweet spot for their instrument. From there, EVO IV features a sophisticated 9-band EQ, with familiar Bass, Middle and Treble controls and six sliders providing precision cut and boost at 100Hz, 180Hz, 340Hz, 1.3KHz, 2.6KHz and 5KHz. The EQ can be switched in via footswitch taking the player from a flat fretless sound to their favourite EQ setting instantly. The NEW 9-band EQ is a revelation of sonic perfection and will surprise older ABM users.
abm 1200 evo iv head one knob compressor
One knob compressor
Other ABM favourite features are retained in EVO IV, including Ashdown’s famous One Knob Dynamic Compressor sub octave note for huge bass tones. Kick it in and this simple to use, great sounding compressor delivers a powerful, even sound, guaranteed to help your bass fill out any mix.
Ashdown ABM 1200 evo iv head sub-harmonic generator control
Sub-Harmonic Generator
Once heard – never forgotten. The ABM Sub-Harmonic generator adds an octave below the notes being played bringing fullness to any bass part. The Sub level is independently controllable, letting you dial in anything from a subtle hint of deep bass to a full-on subterranean funk.
Ashdown ABM 1200 evo iv head professional connections  including jack and speakon sockets
Professional Connections
Not that you'd expect any less, ABM is loaded with connectivity. A tuner output, Line out, transparent 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.

The ABM 1200 has dual 600 watt power sections with two Neutrik Jack/Speakon sockets for each power section. Each of the power sections has a minimum 4 ohm load allowing flexible partnering options with a dedicated range of ABM EVO IV cabinets. The ABM 1200 EVO IV can be used to power the following set ups. A single 8 ohm cabinet, a pair of 8 ohm cabinets, four 8 ohm cabinets, a single 4 ohm cabinet or lastly a pair of 4 ohm cabinets.
Ashdown fs4 footswitch
Flexible Footswitching
Paired with our FS-4 footswitch (not included) the ABM comes alive for onstage use, enabling on-the-fly tonal gearshifts. With footswitchable Valve Drive, Compression, EQ and Sub Harmonic Generator, ABM puts dozens of sound combinations at your feet, without so much as an effect pedal in sight.


ABM 1200 User Manual
ABM 1200 Data Sheet

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