Multiple independently-processed subwoofers tame room resonances for wider listening areas.

Evidence

These days multiple subwoofers are increasingly being used to tame aggressive room resonances, delivering better bass to multiple listeners. Most are connected to the same output, receiving the same signal but some advanced multi-subwoofer designs use processing in the line-level signals to individual subwoofers, so one might occasionally see 7.4.4 or the like. — Toole, Floyd E, Sound reproduction- the acoustics and…, 787

The system looks as though it should have good bass performance, and it did—it was my first home theater where, in 1988, I employed multiple subwoofers to manipulate room resonances. — Toole, Floyd E, Sound reproduction- the acoustics and…, 956

Categorization

• XREF: Connects to earlier chapters’ treatment of room modes and bass management — multiple subwoofers spatially average modal peaks.
• corroborated: 2 independent passages support this claim — Toole, Floyd E, Sound reproduction- the acoustics and…, 787; Toole, Floyd E, Sound reproduction- the acoustics and…, 956