RedSub is a house brand of UK music retailer Gear4music, headquartered in York, which launched the line in 2012 to offer affordable bass guitars and bass amplification under its own label. The range is sold primarily through Gear4music's online store rather than via a dedicated RedSub website.

The catalog centers on electric bass guitars at budget and mid-budget price points, including the Coliseum fanned-fret multi-scale series in 5 and 6-string configurations, the Infinity fan-fret bass, the FN traditional-style bass, and the HB semi-hollow bass. On the amplification side, RedSub produces solid-state bass combo amps such as the BP20plus and BP80plus, higher-wattage heads like the 500W bass amp, and matching 1x15, 2x10, and 4x10 cabinets. Instrument manufacturing is handled overseas, with the fanned-fret Coliseum basses produced in Vietnam.

RedSub is positioned as an entry-level and intermediate option, frequently discussed on forums like TalkBass and Basschat as a value pick for players seeking multi-scale or active-preamp features without the cost of boutique builders. The 500W bass amp received a five-star review from MusicRadar, and the fanned-fret Coliseum line has drawn attention among extended-range bass players on a budget.

RedSub has 4 products cataloged on Equipboard, including Electric Basses, Bass Effects Pedals, and Bass Combo Amplifiers.