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 Integrator or down to 18 Hertz when used with the INFRA-M Integrator. The QUARTZ-R includes casters, handles, feet and pole mount adapters for support of upper range speakers.