SKU: 887312992

Ashdown UK-ABM-300-EVO4 UK Built Bass Magnifier Head - 300W

Sale price$733.05 Regular price$814.50
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Description

Ashdown UK-ABM-300-EVO4 UK Built Bass Magnifier Head - 300WFor over two decades, the Ashdown ABM range has set the standard for bass players seeking authentic tone, immense power, versatility, and unwavering reliability. Recognisable by its glowing VU meter, the ABM series has graced stages across the globe. Now, the ABM EVO IV takes this legacy even further. Its class leading preamp sophistication combines with a formidable 300 watt power stage, available in three head versions rated at 300W, 600W, and

For over two decades, the Ashdown ABM range has set the standard for bass players seeking authentic tone, immense power, versatility, and unwavering reliability. Recognisable by its glowing VU meter, the ABM series has graced stages across the globe.

Now, the ABM EVO IV takes this legacy even further. Its class-leading preamp sophistication combines with a formidable 300-watt power stage, available in three head versions rated at 300W, 600W, and 1200W. The Variable Valve Drive Plus offers a wide range of tones, from clean to overdriven, with foot-switch control for seamless transitions.

But the real star of the show is the all-new 9-band EQ, providing precision control over your sound. It's accompanied by Ashdown's One Knob Dynamic Compressor and Sub-Harmonic Generator, ensuring your bass cuts through any mix.

Professional connections, including a tuner output, transparent FX loop, and Line Input, make the ABM EVO IV a versatile choice for stage and studio. Paired with the optional FS-4 foot-switch, you'll have complete control over your tonal shifts.

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.
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.
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.
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.
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.

A pair of Neutrik Jack/Speakon sockets with a minimum 4 ohm load provide flexible partnering options with a dedicated range of ABM EVO IV cabinets. The ABM 300 EVO IV can be used to power a single 8 ohm cabinet, a pair of 8 ohm cabinets or a single 4 ohm cabinet.
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.

Specifications

  • Power Output - 300 Watts
  • Power Requirement - 115-230 Volts
  • Speaker Outputs - 2 x Neutrick 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
  • Effects Send - Impedance 22k Ohm, Level 0dBu nominal
  • Effects Return - impedance 22k Ohms, Input Level 0dBu Nominal
  • Pre Amp Tubes - 1 x 12AX7
  • H x W x D (mm) - 146 x 488 x 336
  • Weight (kg) - 12.5
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 887312992

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Amazon Customer
Dallas, US
★★★★★ 5
Great.
Color: Swift Grey, Size: 1 Pack, Style: USB Receiver
Great deal. Works great.
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Reviewed in the United States on May 24, 2026
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Richard
Chelsea, US
★★★★★ 4
It's a good working mouse but it's loud clicking and a little small.
Color: Swift Grey, Size: 1 Pack, Style: USB Receiver
I thought I was getting a quite clicking mouse but this is not it. I may have misunderstood the description or confused this mouse with another while researching. It's not a five star for me because it clicks loud and it's small and too easy to accidentally click one of the buttons when you don't want it clicked. The accidental clicking happened a lot and was becoming frustrating. As a working mouse, it does its job and it's reliable. Overall, I like the appearance of it and it feels nice and grips good. I think the price is reasonable for this product. I ended up getting a quite mouse to replace this one, but I am keeping it as a backup.
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Reviewed in the United States on May 2, 2026
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David
Alexandria, US
★★★★★ 5
Very Fast
Color: Red, Size: 1 Pack, Style: USB Receiver
The Logitech M185 Wireless Mouse was exactly what I needed. This mouse works great and included a battery to get you started. No problems using it with my HP EliteBook laptop. I have to say, I was impressed with how fast I got the product. I don't think I could have driven to the store and back any faster. The service and price were worth it. Thanks again Amazon.
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Reviewed in the United States on April 7, 2026
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TrulyAPositive
Charlottesville, US
★★★★★ 5
Great Computer Mouse
Color: Swift Grey, Size: 1 Pack, Style: USB Receiver
This is a great mouse! Just delivered and setup and used. Setup was a breeze and it worked immediately and it flows so smoothly on my mouse pad. So pleased with this well priced product. No need to hesitate purchasing this computer mouse. You won't be sorry. Thank you Logitech and Amazon Prime!
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Reviewed in the United States on March 31, 2026
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Hank
Lowell, US
★★★★★ 5
Logitech M185 Wireless Mouse
Color: Black, Size: 1 Pack, Style: USB Receiver
Good mouse, works well. Nice small comfortable size. I always buy Logitech if I need to replace a mouse.
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Reviewed in the United States on May 3, 2026

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