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Ashdown Rootmaster 420W 1x15 Bass Combo Amp

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After months of research & development, Ashdown has designed a range of products that are equipped with more features, more power, new stylish de...Click To Read More About This Product

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See All Ashdown Solid State Combo Bass Amplifiers

Big low-end power in a portable combo.

After months of research & development, Ashdown has designed a range of products that are equipped with more features, more power, new stylish designs and best of all, a dramatic reduction in size and weight. The Rootmaster range of bass amplifiers truly stands out from the crowd.

The RM-420 combo features a comprehensive Pre Amp, with a classic 5 band EQ, an all-new compressor, plus footswitchable Drive and Sub Harmonic effects. A newly designed Class D power section and specially designed Ashdown 1 x 15" speaker help keeps the weight down. Other features include a mini jack auxiliary input with level control, FX loop, XLR DI, Speakon/Jack combination out and a jack input for an (optional) FS-2 footswitch. The all new MAG RM range is the solution for bassists who need affordable and dependable light weight power houses that present real low-end power.

Simple, powerful EQ
It all starts with an ultra-low-noise instrument input where the accompanying Input Level control helps you perfectly match the output of your bass. Five-band rotary tone controls act with surgical precision to provide total control over your sound, while a Shape switch instantly dials you in to a classic Ashdown tone setting, straight from the world-famous ABM.

One-knob Compression
Instantly adding warmth and body to your tone, this simple to use, great sounding compressor delivers a powerful, even sound to make sure your bass will fill out any mix.

Footswitchable variable overdrive
With footswitchable flexibility, our tube-emulated overdrive can take your core bass sound and push it into warm overdrive through to distorted filth whenever you need to add extra grind and girth to your tone.

Kick it down
Bringing extra depth and definition to your bass parts, the Sub-Harmonic Generator lets you dial in a sub-octave and kick it in via footswitch whenever you need the extra depth for those super-heavy Godzilla moments.

Totally connected
If you want to use your favourite pedals or multi-effects, you'll find send and return sockets on the back panel, along with a DI output for direct injection into the PA mixer or recording console and a Line Input (with front panel level control) so you can jam along with a backing track in rehearsal.

  • Flexible, lightweight, and high powered bass amp with an Ashdown 15" speaker
  • Built-in compressor and footswitchable overdrive for added punch and growl
  • On-board Sub-Harmonic effect for added depth (footswitchable via optional FS-2 footswitch)
  • Comprehensive five-band rotary EQ; Shape function boosts high and low frequencies
  • Balanced XLR Direct Out; Effects Loop; Auxiliary Line In with Mix Control

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  • Power: 420W
  • Single channel
  • Speaker: 1x15"
  • Controls: 5-band EQ, input level, compression, drive, sub, output, line mix
  • Impedance: 8 Ohm
  • FX loop
  • Direct line out
  • Dual outputs: 23.7" x 18.4" x 13.1"
  • Dimensions: 48.5 lb.

Review Snapshot

by PowerReviews
AshdownRootmaster 420W 1x15 Bass Combo Amp

(based on 2 reviews)

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Reviewed by 2 customers

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(7 of 10 customers found this review helpful)


Just didn't stack up

By Billy

from Twin Falls, ID

About Me Professional Musician

See all my reviews


  • Beautiful Construction
  • Lightweight
  • Portable


  • Difficult To Use
  • Poor Sound Quality
  • Weak

Best Uses

    Comments about Ashdown Rootmaster 420W 1x15 Bass Combo Amp:

    I had been shopping for a few weeks for a very exact set of specifications for a new bass amp: I wanted light weight, at least 300 watts, powered extension cab outputs, multiple 10" speakers, and no silly, gimmicky effects or built in tuners. Who needs a built in tuner? I also didn't want to spend a small fortune, which is where I was hitting a bump. Hartke had discontinued the HyDrive 210c, Kustom had dropped their Groove Bass line, Peavey had no offerings at all. MarkBass and Trace Elliot had what I was looking for, but were a bit out of my price range. New models from Ampeg and GK were on the way, but I had an itch needed scratched. I was ready to settle on a single 15" combo and almost pulled the trigger on a Peavey MAX when I stumbled across this Ashdown.

    I had never heard of Ashdown before, so after some rather exhaustive research, I learned Ashdown amps were very popular in the UK, and came with strong recommendations from their fans. So I did a silly thing: I bought an amp I had never played through or heard from a brand I didn't know existed.

    MF shipping, as always, was fast and actually early. As I gleefully unwrapped the new toy, I discovered a beautifully constructed piece of equipment. Remarkable attention to detail. I mean, this is just a nice amp that looks very high-end.

    And then...then I played it.

    I play a Schecter Stiletto Elite-5. This thing has active EMG HZ40 pickups...they're quite hot. I had to crank the input knob on the amp to about 75% and the output knob to about 60% to get anything resembling volume. It did not sound or feel like 420 watts AT ALL.

    And the sound quality...ugh. Based on my research, I was expecting warm, buttery, punchy tones. I got rather flat, square sounding tones. And the low B string just basically made the amp cough.

    I spent an hour fiddling around with the EQ settings, the compressor, the drive setting. The sub-octave feature was a joke, and sounded like a broken chorus.

    Sadly, I was not satisfied. I contacted MF customer service straight away, and those helpful guys got my RA filed, and back in the box she went.

    I sincerely hope I got a defective model, but my main advice here is DO NOT BUY AN AMP YOU'VE NEVER HEARD THAT YOU CANNOT DEMO. Find an online video or SOMETHING, at least. I also hope people out there are enjoying this if they've purchased one. Unfortunately, I did not.

    Props to the guys at Musician's Friend for taking care of me. Super helpful, and really great guys. Even helped me troubleshoot a bit to make sure it wasn't just me. Rock on, MF.



    By The Breeze

    from Arizona

    About Me Professional Musician


    • Nice looking


    • Poor Sound Quality
    • Weak

    Best Uses

    • Performances

    Comments about Ashdown Rootmaster 420W 1x15 Bass Combo Amp:

    I have been searching for a 15 inch bass combo amp and decided to give the Ashdown 420 Rootmaster a shot. What a mistake! Other then it's looks there is nothing good about this amp. They claim to be a 420 watt amp but it's closer to 100 watts. The sound quality is poor and it is very very heavy! At high volume (as high as I can safely push it) the lower notes distort. Maybe England and the U.S. differ in the measurement of wattage. Stay away from Ashdown!

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