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
Developed with Pantera's Rex Brown, the RB-800 is an 800-watt UK-built bass head that blends Ashdown's signature tone with Rex's gritty edge. Featuring a versatile EQ section, Sub Harmonic Generator, Compression Control, and Valve Emulated Drive, it delivers everything from thunderous lows to snarling overdrive.
With an Analogue Cab Sim DI, modern connectivity, and a lightweight, road-ready build, the RB-800 is equally at home on stage or in the studio - built for bassists who demand power, precision, and attitude.
SPECIFICATION Power Output - 800 WattsPower Requirements - 115-230 VoltsSpeaker Outputs - 2 x Neutrik Speakon/Jack outputsFrequency Response - -3dB @ 22Hz and 25KHzHigh Instrument Input - Impedance 3.9m Ohms, input range 150mV - 20 p-pLow Instrument Input - Impedance 10k Ohms, input range 300mV - 405V p-pLine Input - Impedance 22k Ohms, input level 0dBu nominalDI Output - 420 Ohm balanced, Level 0dBu nominal Impedance - Minimum 4 OhmsSignal 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 shelvingEffects Send - Impedance 22k Ohm, Level 0dBu nominalEffects Return - Impedance 22k Ohms, Input Level 0dBu NominalDistortion - Less than 0.5% THDH x W x D (mm) - 89 x 311 x 235Weight (kg) - 2.5 The Rootmaster 800 EVO III is a precision-engineered bass amplifier with a comprehensive EQ system, Ashdown Sub Harmonic Generator, Compression control, and a versatile Valve Emulated drive. It's the Swiss army knife for bass players, excelling in any musical setting, whether on stage or in the studio. In a world that is increasingly embracing silent stages and in-ear monitoring, Ashdown remains resolute in its commitment to delivering top-tier bass amplifiers. The Rootmaster EVO III, in response to the evolving needs of bass players, now features a new Analog Cab Sim Di output. This innovation provides you with a newfound level of flexibility in managing your on-stage and front-of-house monitoring, empowering you to achieve an exceptional monitor mix effortlessly. As for raw power, the Rootmaster EVO III boasts a staggering800 Watts of output, making it well-suited for a wide range of performancescenarios. 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. The rear panel of the amp hosts a balanced D.I. with an XLR socket, delivering a post-E.Q. and post-effects signal. You can easily select this option using the Balanced default setting on the front of the amp. But the innovation doesn't stop there; Ashdown has meticulously designed a series of filters, finely tuned to replicate the response of their legendary ABMcabinets. You can choose between engaging the CAB SIM DI or the BALANCED DI output through the XLR DI option, enabling you to tailor your sound to perfection. Additionally, you have the choice between PORTED and SEALED enclosure options, affecting the resonance and bottom end response of your sound. The SPEAKER option presents a choice between a 10" speaker, known for its tight, defined mid-range, and a 15" speaker, prized for its depth and clarity. Finally, the HORN option allows you to add a high-end boost at around 5k, emulating the presence of a horn within a cabinet. The possibilities are endless, offering a level of customization that is unparalleled. Balanced DI 10" Sealed 10" Ported 15" Sealed 15" & Horn 15" Ported (function() { if(!window.hypervisualIsEditorContext) { var sliderOptions = { loop: true, autoplay: false, effect: 'slide', fadeEffect: { crossFade: true }, containerModifierClass: 'hypervisual__slider-container-', wrapperClass: 'hypervisual__slider-wrapper', slideClass: 'hypervisual__slider-slide', slideActiveClass: 'hypervisual__slider-slide-active', slideDuplicatedActiveClass: 'hypervisual__slider-slide-duplicate-active', slideVisibleClass: 'hypervisual__slider-slide-visible', slideDuplicateClass: 'hypervisual__slider-slide-duplicate', slideNextClass: 'hypervisual__slider-slide-next', slideDuplicatedNextClass: 'hypervisual__slider-slide-duplicate-next', slidePrevClass: 'hypervisual__slider-slide-prev', slideDuplicatedPrevClass: 'hypervisual__slider-slide-duplicate-prev', buttonDisabledClass: 'hypervisual__slider-button-disabled', lazyLoadingClass: 'hypervisual__slider-lazy', lazyStatusLoadingClass: 'hypervisual__slider-lazy-loading', lazyStatusLoadedClass: 'hypervisual__slider-lazy-loaded', lazyPreloaderClass: 'hypervisual__slider-lazy-preloader', preloaderClass: 'preloader', zoomContainerClass: 'hypervisual__slider-zoom-container', notificationClass: 'hypervisual__slider-notification' }; sliderOptions.pagination = { clickable: true, el: '.hypervisual__slider-pagination', bulletClass: 'hypervisual__slider-pagination-bullet', bulletActiveClass: 'hypervisual__slider-pagination-bullet-active', modifierClass: 'hypervisual__slider-pagination-', currentClass: 'hypervisual__slider-pagination-current', totalClass: 'hypervisual__slider-pagination-total', hiddenClass: 'hypervisual__slider-pagination-hidden', progressbarFillClass: 'hypervisual__slider-pagination-progressbar-fill', clickableClass: 'hypervisual__slider-pagination-clickable' }; sliderOptions.navigation = { nextEl: '.hypervisual__slider-button-next', prevEl: '.hypervisual__slider-button-prev', }; var slider = new Swiper ('#hypervisual__slider_355284241', sliderOptions); window.addEventListener("load", function(event) { slider.el.className = slider.el.className.replace('hypervisual__slider-container-pending', ''); slider.update(); slider.pagination.render(); slider.pagination.update(); }); } })(); Resources RB-800 User Manual Download
• Frequency Response: –3dB @ 22Hz – 25kHz
• 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
• Distortion: Less than 0.5% THD
DIMENSIONS & WEIGHT
• H × W × D (mm): 89 × 311 × 235
• Weight: 2.5 kg
Precision Built for a Metal Icon
Rex Brown Signature Power
The Rex Brown RB-800 is a signature bass amplifier designed to capture the unmistakable tone of one of metal's most iconic bassists. Featuring a comprehensive EQ system, Ashdown's Sub Harmonic Generator, one-knob compression, and a versatile Valve Emulated Drive, the RB-800 provides the tools Rex relies on to deliver his massive, cutting tone. From stadium-shaking lows to snarling overdriven growl, this amp puts his sound into your hands.
Analogue Cab Sim DI for Modern Touring
Stage-Ready Innovation
Built for today's stages, the RB-800 incorporates a dedicated Analogue Cab Sim DI output, making it the perfect partner for silent stages and in-ear monitoring setups. Rex's signature sound translates flawlessly to front-of-house or your monitor mix, ensuring that the low-end weight and clarity of your tone is preserved wherever you play. It's a professional feature designed for the modern touring bassist.
800 Watts of Signature Ashdown Power
Relentless Output
At its core, the RB-800 boasts 800 watts of output, providing the power and headroom needed to handle any venue - from intimate clubs to massive arenas. With 115-230V compatibility, it's ready for international touring. Dual Neutrik Speakon/Jack outputs provide bulletproof connectivity, while a frequency response of -3dB from 17Hz to 30kHz ensures Rex's earth-shaking lows and articulate highs are faithfully reproduced.
Built for Real-World Demands
Complete Connectivity
The RB-800 is designed with the working bassist in mind. Featuring high and low instrument inputs, a line input, a balanced DI output, and a dedicated tuner output, it's as practical as it is powerful. Whether you're in rehearsal, in the studio, or on the stage, the RB-800 integrates seamlessly into any setup, ensuring reliability and performance every time.
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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