UK-RBM-800
UK-RBM-800
UK-RBM-800

Ashdown Engineering

UK-RBM-800

£899.00

Please note: All UK-built products are made to order. The approximate lead time is 20 days.

For more information, please email: info@ashdownmusic.co.uk

The UK-RBM-800 (Rootmaster Bass Magnifier) is a UK-built, lightweight 800-watt bass head finished in striking Ice Blue. Designed to magnify you bass tone with clarity and power, it features Ashdown’s signature Sub-Harmonic Generator, smooth onboard Compression, responsive Overdrive, and versatile FX Loop, Headphone Out, DI, and an analogue Ashdown Cab Sim SI. Compact yet commanding, it delivers reliable performance and unmistakable Ashdown character on stage, in the studio, or at home.

Pairs well with

Ships within 1-2 business days (UK Customer Orders Only)

5 Year Warranty

Engineered to Last, Trusted by the Best

Product Specifications

POWER

• Power Output: 800 Watts
• Power Requirements: 115–230 Volts
• Impedance: Minimum 4 Ohms

CONNECTIVITY & I/O

• Speaker Outputs: 2 × Neutrik Speakon/Jack outputs
• High Instrument Input: Impedance 3.9M Ohms, input range 150mV – 20V p-p
• 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
• Effects Send: Impedance 22k Ohm, Level 0dBu nominal
• Effects Return: Impedance 22k Ohms, Input Level 0dBu nominal

PERFORMANCE

• Frequency Response: –3dB @ 22Hz and 25kHz
• 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
• Distortion: Less than 0.5% THD

DIMENSIONS & WEIGHT

Dimensions
• Height: 89 mm
• Width: 311 mm
• Depth: 235 mm
• Net Weight: 2.5 kg

British Craftsmanship, Modern Power

The Ashdown UK-RBM-800 (Rootmaster Bass Magnifier) is the next evolution of the celebrated Rootmaster range - now hand-built in the UK and designed to truly magnify the essence of your bass tone. Finished in a distinctive Ice Blue and housed in a lightweight, gig-ready chassis, this 800-watt head delivers the authority, articulation, and tonal richness that working bassists demand, without sacrificing portability.

Core Tone-Shaping Tool

At its core, the UK-RBM-800 features the complete suite of Ashdown's iconic tone-shaping tools. From precision EQ shaping to dynamic response, every control is designed to give bassists intuitive, musical command over their tone across a wide range of styles and playing techniques.

Depth, Dynamics, and Drive

The Sub-Harmonic Generator let you blend in a powerful octave below your fundamental notes, adding weight and dimension to everything from modern low-tuned grooves to classic vintage lines. The onboard Compressor smooths out peaks with a natural, musical feel, while the valve-emulated Overdrive circuit delivers tones ranging from warm harmonic lift to full, textured growl.

Studio and Stage Connectivity

The built-in FX loop allows seamless integration with external pedals and processors, ensuring the amp sits comfortably at the centre of even the most complex signal chains. For direct applications, the UK-RBM-800 includes both a traditional DI output and an analogue Cab Sim DI that recreates the response of a perfectly mic'd Ashdown cabinet - ideal for live engineers and recording environments alike.

Practice, Performance, and Reliability

User

manual

CLICK THE IMAGE ABOVE TO DOWNLOAD THE USER MANUAL

FAQs

Please read our FAQs page to find out more.

How Long Will My Order Take To Arrive?

Orders placed before 3pm (Monday-Thursday) are dispatched on the same day. UK Customer orders are shipped on a next-day delivery service via TNT.

Do You Shop To Outside Of The UK?

Currently, we do not facilitate orders to outside of the UK. If there is a specific product that you are after, be sure to check our Dealer Locator to find your closest Ashdown dealer!

If you cannot find a local dealer, please do not hesitate to get in touch and we will try and assist!

Do Ashdown Products Come With A Warranty?

Yes! All Ashdown product purchased include a 5 year warranty, giving you peace of mind and long-term support.

For more information on warranties, visit our Warranty Info page!

Where Can I Buy Ashdown Spares and Accessories?

Spare parts, footswitches, and accessories can be purchased directly through our in-house service team. If you're looking for something specific, our team will be happy to point you in the right direction!

How Can I Contact Ashdown Support?

Our passionate UK-based team is always ready to help. You can get in touch by phone or email, and we'll be happy to assist with any questions.

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