Powered subwoofer hardware can be repurposed as active bass absorbers

Evidence

Alternatively, active bass absorbers are available. These resemble powered subwoofers but they have microphones and control electronics that turn them into absorbers of bass, not producers of bass. With electronics involved they can be very flexible in what they absorb. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1568

Categorization

• DEFINE: Clarifies what an active bass absorber is versus a powered subwoofer.