Quartz-R Quad 18in Subwoofer

The QUARTZ-R is a
very high output concert
INFRA™ subwoofer system designed to minimize
the space
required to obtain extremely high level and high fidelity Extended
low frequency output. The QUARTZ-R provides perfectly flat response
down
to 8 Hertz when used in conjunction with the 8 Hertz
Integrato...