amp · bass head

RB-800 (Rex Brown Signature)

Rex Brown's signature 800-watt head, built in the UK on Ashdown's Rootmaster platform.

Watch

Guitar World's NAMM 2026 round-up covers Ashdown's UK-built range, so the RB-800 appears alongside the rest of the line rather than on its own.

Why it matters

It carries the Rootmaster feature set — five-band EQ, sub-harmonic generator, one-knob compressor and a valve-emulated drive — in a 5.5 lb chassis. The DI section is more complete than most at this level, with an analogue cab-sim output plus a post-EQ XLR for sending a shaped signal to a desk. Debuted at NAMM 2025.

Note

Debuted at NAMM 2025, the UK-made RB-800 is Pantera bassist Rex Brown's signature head, built on the Rootmaster platform. It packs an 800-watt Class D power stage, a five-band EQ, sub-harmonic generator and an analogue cab-sim DI into a 5.5 lb chassis.

Specifications

• 800W
• solid state
• 5-band EQ
• Sub Harmonic Generator
• one-knob compressor
• Valve Emulated Drive
• analog cab-sim DI + post-EQ XLR
• FX loop
• 5.5 lb (2.5 kg)

Before you buy

• 800W solid state — match it to a cabinet rated for the load you need
• 5.5 lb, with no bag or rack case listed
• the analogue cab-sim DI and post-EQ XLR are the reason to choose it over a bare head

Sources

• sweetwater.com
• notreble.com
• ashdownmusic.com