Ashdown Engineering


Introducing the Ashdown Rootmaster 500 EVO III - the ultimate solution for bass players who demand power, versatility, and portability. This compact powerhouse is designed to deliver the iconic Ashdown tone, featuring a comprehensive EQ, Ashdown Sub Harmonic Generator, Compression control, and variable Valve Emulated drive. Engineered for reliability, it's a tool built to last a lifetime with responsible design. The EVO III also offers innovative features like an Analogue Cab Sim Di output, balanced D.I., and customizable filters for your monitor mix. With 500 watts of power, it's a game-changer for bassists.
Please Note:
Direct purchases NOT available in the United States
Find your local dealer HERE


  • Power Output - 500 Watts
  • Power Requirements - 115-230 Volts
  • Speaker Outputs - 2 x Neutrik Speakon/Jack 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 - 405V p-p
  • Line Input - Impedance 22k Ohms, input level 0dBu nominal
  • DI Output - 420 Ohm balanced, Level 0dBu nominal

  • Impedance - Minimum 4 Ohms
  • Signal to noise- Better than 80dB (EQ flat)
  • EQ - Bass +/-15dB @ 100Hz, Lo Mid +/-15dB @ 340Hz, Middle +/-15dB @ 660Hz, Hi Mid +/-15dB @ 1.6kHz, Treble +/-15dB @ 7kHz shelving
  • Effects Send - Impedance 22k Ohm, Level 0dBu nominal
  • Effects Return - Impedance 22k Ohms, Input Level 0dBu Nominal
  • Distortion - Less than 0.5% THD
  • H x W x D (mm) - 89 x 311 x 235
  • Weight (kg) - 2.5

Ashdown rm800 evo ii head front panel with matt black anodised alloy finish
With a formidable power output of 500 watts, a wide frequency response, and a responsive 5-band EQ, the Rootmaster EVO III puts you in control of your sound, ensuring it resonates on and off the stage.

While this amplifier represents a new chapter in Ashdown's digital offerings, it remains faithful to their timeless analogue approach to tone. The Ashdown Rootmaster 500 EVO III is a testament to the brand's enduring dedication to crafting exceptional bass amplification solutions.
Ashdown rm 800 evo ii head eq controls
The Ashdown Rootmaster series has been a hallmark of
excellence, known for delivering the signature Ashdown tone, immense power, and unwavering reliability—all in a lightweight package. At the heart of this
amplifier lies an exceptionally comprehensive EQ, one of the most versatile in
the industry, enabling bassists to fine-tune their sound with precision.

The Ashdown Sub Harmonic Generator, a tried-and-tested gem in the Ashdown arsenal, takes the low-end response to new depths, while the Compression control and variable Valve Emulated drive add a touch of grit and warmth to your sound. In
essence, the Rootmaster 500 EVO III is your Swiss army knife for bass amplification.
Ashdown rm 800 evo ii head one know compressor
As for raw power, the Rootmaster EVO III boasts a staggering
500 Watts of output, making it well-suited for a wide range of performance
scenarios. It is versatile in terms of power requirements, accommodating both 115-230 Volts, making it a globetrotter's dream.

The two Neutrik Speakon/Jack outputs ensure robust and reliable connectivity, and the frequency response spans from -3dB at 17Hz to 30KHz, capturing the entire bass spectrum with unparalleled precision. The high and low instrument inputs, along with the line input, provide flexibility for different basses and sources.

A balanced D.I. output guarantees that your signal is primed for front-of-house mixing, and a tuner output simplifies your tuning setup.
Ashdown rm 800 evo ii head over drive and sub controls
In an age where the landscape of live performances has evolved, with silent stages and in-ear monitoring becoming standard, Ashdown continues to innovate. The NEW Analogue Cab Sim Di output on the Rootmaster EVO III provides bass players with greater control over their on-stage and front-of-house sound.

On the rear panel, a balanced D.I. output via the XLR socket offers a post-EQ and post-effects signal. But the true innovation lies in the customizable filters, which emulate the response of Ashdown's legendary ABM cabinets.
You have the freedom to choose between CAB SIM DI and BALANCED DI outputs via the XLR DI option. Additionally, the enclosure options of PORTED and SEALED allow you to modify the resonance of the output, either extending the bottom end or tightening it up.

The SPEAKER option lets you select between a 10” speaker, known for its tight, defined mid-range, and a 15” speaker, prized for its depth and clarity. The HORN option, featuring an IN or OUT selection, accentuates the high-end frequencies around 5kHz, similar to the presence of a horn in a cabinet.
Balanced DI
10" Sealed
10" Ported
15" Sealed
15" & Horn
15" Ported


RM 500 EVO III User Manual

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