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Ashdown RM-500 Rootmaster EVO III 500-watt Bass Head

500W Bass Amplifier Head with 5-band EQ, Sub-harmonic Generator, Compressor, Valve-emulated Drive, and Cab Sim DI
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Item ID: RM500EVO3
Ashdown RM-500 Rootmaster EVO III 500-watt Bass Head
Price:$799 and 00 cents
Special Financing - Ends Aug 2, 2026. $23/month with 36 month financing*

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Ashdown RM-500 Rootmaster EVO III 500-watt Bass Head
Backordered - More On The Way! Notify me
Price:$799 and 00 cents
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Powerhouse Performance from a Compact Bass Head

Representing an elevation of Ashdown's acclaimed EVO series, the Rootmaster 500 EVO III equips bassists with a satisfying combination of muscular power, sonic versatility, and convenient portability. This brawny bass amp head delivers 500 watts of five-star Ashdown tone that you can sculpt and mold to ear-grabbing perfection with a responsive 5-band EQ. The RM-500 includes Ashdown's famous sub-harmonic generator as well as a built-in compressor, yielding thunderous, chest-thumping low end for days. You also get a valve-emulated drive for adding a hint of grit and warmth to your sound. The RM-500 boasts a handy cab sim DI output, along with a balanced, post-EQ XLR output option with reliable Neutrik connectors. The Ashdown RM-500 Rootmaster EVO III offers bassists exceptional amplification with lightweight portability and zero sonic compromises.

500 watts of premium Ashdown tone

Armed with a formidable 500 watts of output, the RM-500 EVO III delivers Ashdown's venerated signature tone, power, and reliability — all in a compact, lightweight bass amp head. The RM-500 puts you firmly in the driver's seat, thanks to its responsive 5-band EQ, enabling you to fine-tune your sound with pinpoint precision.

Bursting with tone-twisting features

Sweetwater bassists are meticulous about tone, and given the level of onboard control available on the Rootmaster 500 EVO III, it's clear that Ashdown gets us. It all starts with Ashdown's popular sub-harmonic generator, a tried-and-tested gem that's guaranteed to shake the room and jiggle the rafters. The RM-500's built-in compressor ensures a full, consistent sound with truckloads of low-end punch. Need extra grit and warmth? If so, the RM-500's valve-emulated drive is on hand to accommodate you.

Ample DI options

The RM-500 EVO III provides bass players with exacting control over their onstage and front-of-house sound. For starters, it includes a balanced, post-EQ XLR output. Optionally, you can activate the RM-500's cab sim DI output, which includes customizable filters based on Ashdown's acclaimed ABM cabinets, along with options for a ported/sealed enclosure, speaker size, and horn.

Ashdown RM-500 Rootmaster EVO III Bass Head Features:

  • 500W bass amplifier head with a compact, lightweight design
  • Responsive 5-band EQ allows you to sculpt and mold your tone
  • Ashdown's popular sub-harmonic generator is guaranteed to shake the room and jiggle the rafters
  • Built-in compressor ensures a full, consistent sound with truckloads of low-end punch
  • Valve-emulated drive adds a hint of grit and warmth to your sound
  • Balanced, post-EQ XLR output is primed for front-of-house mixing
  • Cab sim DI output with options for a ported/sealed enclosure, speaker size, and horn
  • Effects loop makes integrating your pedalboard easy
  • Robust Neutrik connectors

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Tech Specs

  • Type: Solid State
  • Number of Channels: Single channel
  • Output Power: 500W
  • Effects: Valve-emulated Drive, Sub Harmonic Generator
  • Compression: Yes
  • EQ: 5-band EQ, Shape switch
  • Amp Modeling: Speaker Sim
  • Inputs: 1 x 1/4" (instrument), 1 x 1/4" (line)
  • Outputs: 2 x SpeakON (4 ohms), 1 x XLR (Cab Sim DI out)
  • Headphones: 1 x 1/4"
  • Effects Loop: Yes
  • Footswitch I/O: 1 x 1/4" (drive, subharmonic generator)
  • Footswitch Included: No
  • Cooling System: Internal Fan, Rear/Side Air Vents
  • Power Source: Standard IEC power supply
  • Manufacturer Part Number: RM-500-EVO III

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Reviews

Great Amp
I haven't had the amp for long but it sounds amazing. The compression and drive sound good. It literally can make any bass sound great. I got it with the Evo 2 2/12 cabinet. It's compact and loud and crisp. I'm impressed. The warranty and serviceable components was a decider as well.
A Sweet Class D Bass Amp!
First off, this class D bass amp has a richness to its sound. It's warm and very punchy, not sterile sounding at all. The amp features are very well laid out and they work great. A mute switch, an EQ bypass, a sub harmonic, a headphone out etc. This amp gives you lots out options and if you want volume, its got lots of that. Simply set the gain correctly, adjust your volume and then adjust the compression to taste. The compression adjustment makes a huge impact on not only your overall tone, but it also brings up your overall volume substantially as you dial it up. Its got two speakon connectors on the back as well which is great as well. The amp looks awesome, sounds awesome and comes with a 5 year warranty. The VU is a super cool feature as well. Check it out!
Music background: Semi professional