Ashdown RM 500-EVO II Lightweight 500w Head

Ashdown RM 500-EVO II Lightweight 500w Head



Order before 3pm Mon-Thu for Next Day Delivery

Ashdown RM 500-EVO II Lightweight 500w Head

Free delivery on this product

Retail Finance
Click and Collect
Ashdown RM-500-EVO II, a Lightweight 500w Bass Amp Head

Ashdown's fantastic Rootmaster bass heads have now reached their second evolution with the RM-500 Evo II! This 500 watt powerhouse is now even more lightweight than ever - almost half the weight of the original RM 500! - and has been specially developed to maintain a deep low end, well-defined mids and transient highs, delivering its output into a 4 Ohm load.

The Perfect Choice for Working Bassists

New additions to the Rootmaster EVO series pre-amp include a passive and active input socket - for use with low and high output instruments respectively - an upgraded power section, and a handy mute button. The clear signal path from your instrument to the input control enables you to finetune your input level with that famous Ashdown VU meter, and once the signal is at its optimal level you are awash in those rich features designed to enhance your tone.

Bags of On-Board Features

With it's Shape button, 5-band EQ and on-board compressor, Drive control, and sub-harmonic controls, your tone-shaping options are many and varied. Whether you want to push out the purest, bright, clean tones, or delve into the realms of valve-emulated overdrive with fat sub-harmonics to really beef up you sound, the RM-500-EVO II has got you covered.

Easy to Gig With

A new, lightweight model, the RM-500-EVO II is most certainly the perfect choice for working bassists that need all the power of a 500 Watt solid-state head, but without the excess weight - in fact it weighs just 5 KG (just 11lbs), which is significantly less than most other amp heads in the same category.


  • Lightweight and powerful 500 Watt bass-amp head
  • Feature's a simple, yet powerful, in-built EQ
  • Fully controllable built-in Compression, Overdrive and Sub-Octave effects
  • FX Send/Return sockets, and DI Out capabilities in addition to 2 speaker out sockets with a 4 Ohm Minimum load
  • Relatively budget-friendly price accessible to all semi-pro/pro musicians

Technical Specs

  • Power Output: 500 Watts
  • Power Requirement: 115-230 Volts
  • Speaker Outputs: 2 x 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
  • Signal to noise: Better than 80dB (EQ flat)
  • EQ: Bass +/-15dB @ 100Hz Lo Mid +/-15dB @ 220Hz Middle +/-15dB @ 660Hz Hi Mid +/-15dB @ 1.6kHz Treble +/-15dB @ 7kHz shelving Deep +
  • 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): 86 x 314 x 235
  • Weight (kg): 5
More Information
Manufacturer Ashdown
SKU 171888
Shipping Weight (kg) 2.800000
Effects Compression
Power Supply IEC
Warranty 2 Years
Series Rootmaster Evo Series
Power 500 Watts
Amp Type solid-state amplifier


We have a wide range of Delivery Options available, depending on the value of your parcel and budget. Select from our 2-3 Day Saver Service or our Next Working Day options at the Checkout.
This will include a text or email on the day of delivery giving you an exact hour window of when your gear will be with you, and the drivers name - just so you know when to turn the volume down!

  • Free Delivery Available on Selected Products
  • Weekend UK Mainland Delivery (Saturday-Sunday): £19.99
  • Small Items (Under 750g) Small items will be delivered by Royal Mail starting from 99p
  • Heavy Items (Over 30kg): Pallet Service Doorstep Delivery £65

For heavy items, courier details, out of stock products, out of area postcodes or international deliveries see our full Delivery info here.


Rather not wait in for the delivery? Don’t worry, we’ve got you…In Stock items can be ordered and paid for in-advance Online via our Click & Collect service. As long as if it's in stock at your chosen branch, you can collect the item within the hour.

Click here for more about our local Click & Collect Service.


If you and your item aren’t getting along, you have 14 days from when you receive the goods to contact our PMT experts either by phone or email to return your item.

*Please note, we cannot accept returns of:

  • Special/Custom Orders - Any order that is custom or has been personalised.
  • Products with Hygiene Seals - Microphones, any in-ear earphones, monitors, orchestral instruments with mouthpieces and any other items that touch your mouth, nose or inner ear if you have broken the hygienic seal on the packaging.
  • Software & Media - Any software or media that has been opened or registered via physical or digital means.

Click here for more information on Returns at PMT.

Online Orders

If you and your new item aren’t getting along, you have 14 days from when you receive the goods to contact our PMT Experts either by phone or email to return your item or organise an exchange for something more suitable.

Store Orders

If you've changed your mind about something you bought in-store, bring it back within 14 days of purchase and we'll be happy to exchange it for another product, a gift card or store credit.