Beale Street IPLCR4 BB 2-Way In-Wall Speaker - High-Quality Home Audio for Living Room, Bedroom & Home Theater System

Dual 4" in wall LCR 2-way pancake powered by Sonic Vortex®

Our Sonic Vortex® technology generates rich, deep bass and effortless clarity from what most people would call a 'back box', but is not. It is actually a compact, integrated tuned enclosure.
This patented technology is a 'twist' on Ported Transmission Line design, that optimizes air movement to produce astonishing sound. The enclosure also keeps sound from bleeding to other rooms while adding 6 to 9dB boost in mid-lower bass.