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Ashdown ABM-1200-EVO IV 1200w Bass Magnifier Bass Head - Nearly New

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World Renowned Tone

Immediately identifiable on stages around the world thanks to its glowing VU meter, the Ashdown ABM has been a firm favourite with professional gigging bass players for the best part of twenty years. Now in its fifth incarnation, ABM EVO IV pairs class-leading pre amp sophistication with uprated powerhouse performance and an all-new 9-band EQ.

On-Board 9-Band EQ

Plug into the EVO IV and you’ll be greeted straight away by the flickering of the new Input VU meter, allowing you to quickly find the sweet spot your instrument. The Ashdown 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.

Dial in Your Perfect Sound

Ashdown's Variable Valve Drive pre amp section has also been upgraded in EVO IV. Delivering more electrical current to the 12AX7 tube enables more drive and harmonic content than ever before, allowing players to dial in a sound from pristine clean, to the fattest, fullest bass overdrive. On the power amp side, EVO IV promises to be the loudest, punchiest ABM yet, with a next-generation power amp and uprated transformers offering unparalleled levels of headroom, definition and low-end push.

Versatile Tone Shaping Ability

Other ABM favourite features are retained in EVO IV, including Ashdown's famous One Knob Dynamic Compressor and the infamous Sub-Harmonic Generator that lets users blend in a sub octave note for huge bass tones. Paired with an FS-4 footswitch (not included) you can switch the Drive, Compression, EQ and Sub effects in and out on the fly, delivering a huge tonal palette to craft a great performance. As with previous ABMs, EVO IV is well served with a DI out, tuner out, separate Sub out, transparent FX loop and a line input for connection of an external sample or sound source.



  • 2 x 600W Bass Amplifier Head
  • Hybrid Solid-State and 12AX7 Tube Preamp
  • Advanced On Board EQ for Powerful Tone Shaping
  • Built-In Compressor, Tuner Output, and Effects Loop
  • Ashdown sub-harmonic generator accurately tracks your main signal and reproduces it an octave lower
  • 4 Secure SpeakON - 1/4” Jack Outputs for Connecting Speaker Cabinets
  • DI Output with XLR Connection
  • Iconic Ashdown Input level VU Meter


  • Power Output: 600 + 600 Watts
  • Impedance: 4 Ohms Per Side (Minimum)
  • Inputs: 1 x 1/4” Jack (Instrument), 1 x 1/4” Line Input,
  • Outputs:4 x 1/4” Jack/SpeakON (Speakers), 1 x 1/4” Jack (Tuner Out), 1 x 1/4” Jack (Line Out)
  • Other Connections: 2 x 1/4” Jacks (FX Send/Return), 1 x 1/4” Jack (Footswitch)
  • Preamp Tubes: 1 x 12AX7
  • Frequency Response: 17Hz – 30kHz @ -3 dB
  • Input Impedance (High): 3.9 mOhms
  • Input Impedance (Low): 10 kOhms
  • Power Requirements: 115 – 230 Volts
  • Height: 158 mm
  • Width: 610 mm
  • Depth: 355 mm
  • Weight: 28 Kg

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