SB-4000

The SB-4000 is the SB-2000 Pro scaled up to flagship dimensions, and that's the cleanest way to think about it. Same sealed-cabinet design philosophy, same SVS DSP and app-control engine, same group-delay-tight character — but a 13.5-inch driver, a 1,200W RMS amplifier (4,000W peak), and roughly twice the SPL ceiling.

What's unusual is the cabinet choice. Most flagship subs at this price go ported because porting is the easy way to extract more bottom-octave output from a single chassis. SVS went sealed. That gives up about 3–4dB of ultimate bottom-octave SPL versus a comparable ported flagship — but it preserves the tightness, the dialogue time-alignment, and the music-listenable character that the rest of the SB line delivers. The result is a sub that hits harder than the SB-2000 Pro on demanding scenes without trading away the integration.

The honest editorial position: this sub is genuine overkill outside a 25m²+ treated room. In a typical UK living room (15–22m²), the SB-2000 Pro will reach reference SPL on every demanding scene without audible compression, and the SB-4000's headroom goes unused. Spend the £1,100 saving on acoustic treatment, dual SB-2000 Pros, or a better AVR. We say this knowing exactly which sub Worldray earns more on.

The right sub when 30m²+ and treated walls finally let you turn a sub up — not before.