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Ashdown ABM EVO IV 600 Watt Bass Amplifier Head
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Ashdown ABM EVO IV 600 Watt Bass Amplifier Head

by Ashdown
The new Ashdown ABM EVO IV 600w Bass Amp Head is perfectly suited for professional gigging musicians, delivering plenty of power, great tone..

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The new Ashdown ABM EVO IV 600w Bass Amp Head is perfectly suited for professional gigging musicians, delivering plenty of power, great tone and enough versatility to fit any playing style.


Win Tickets to see The Foo Fighters: Purchase this or any other Ashdown Amp/Cab during May 2018 and be entered into a prize draw for two tickets to see Foo Fighters at London's Olympic Stadium on Saturday 23rd June 2018.

Simply purchase the  amp from your local PMT Store or from PMT Online, and your name will automatically be entered. One lucky winner will be drawn out of the hat at the start of June and contacted directly.

Offer excludes Tourbus 10 & 15 models


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 - available in two head versions, rated at 600W and 1200W respectively.

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.

Ashdown’s Variable Valve Drive pre amp 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. 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. 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) the player 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. Complementing the new heads, Ashdown has also announced two news ranges of cabinets. Foundation range cabinets are hand-crafted in the UK featuring 18m ply and custom high-powered BlueLine Plus drivers. Classic range cabinets offer affordable performance with a ply cabinet and BlueLine standard drivers.


  • Bass Guitar Amplifier Head 600 Watts
  • 9-Band EQ
  • Bass, middle and treble controls and six sliders
  • Uses the 12AX7 valve
  • Valve drive control
  • One Knob Dynamic compression and sub-harmonics controls


Amp Typevalve / tube amplifier

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