The C7-TOP is a coaxial, full range loudspeaker with a 75° × 40° constant directivity dispersion down to 600Hz. Its horn loaded 15" low frequency driver, 1.5" exit HF driver and an extended bass response allow use without a subwoofer wherever full range sound and controlled dispersion from a compact cabinet is required.

The C7-SUB is a bass-reflex design with a large port and a long excursion 18" driver. It has the same footprint as the C7-TOP but is taller, allowing a frequency extension down to 44Hz and is ideal in a ground stack of two C7-SUBs and a C7-TOP.

The C4 system is primarily for use in medium large-scale sound reinforcement applications and allows the construction of scalable arrays with precise horizontal and vertical coverage. The C3, C4-TOP and C4-SUB have an identical cabinet shape, size and rigging, and along with the B2 subwoofer, form the basis of an arrayable, modular system. The 35° horizontal dispersion behaviour of C3 and C4-TOP loudspeakers enable flawless coupling when array segments are combined.

The C3 is the hornloaded line array module for the C4 system. The C3 cabinet houses 2 × 10" midrange drivers and 3 × 1.3" exit HF compression drivers with titanium diaphragms, producing a maximum sound pressure level of 144 dB SPL. Utilizing a horizontal dispersion of 35° (above 900 Hz) and with a 5° vertical HF dispersion per cabinet, the C3 is used to build vertical columns producing a curved coherent wavefront. The C3 cabinet is constructed from marine plywood, fitted with steel handles, MAN CF4 stud plate rigging points and has an impact resistant paint finish. The front of the midrange section of the loudspeaker cabinet is protected by a rigid metal grill fitted with a replaceable acoustically transparent foam, and the HF section is fitted with a foam block in the horn throat. Catches are fitted at the top and bottom of the cabinet for securing an optional transport lid E7908. Mounted on the rear panel are ratchet strap guide plates (kelping bars), an EP5 or NL4 connector, two hinge plates, and four heavy duty wheels.

When combining C4-TOPs and C3s in an array the correct time alignment of the system is critical. Adding a delay of 0.3 ms to the D12 channels powering the C4s aligns both systems to achieve perfect coherence over the whole audio band. The C3s vertical array equalization (CPL) is implemented in the D12 amplifier driving the C3 cabinets. If additional external processing is used, ensure that all signal paths in the system are correctly time aligned. If a combination of D12 and P1200A amplifiers are used the latency of the D12 digital signal processing (0.3 ms) must be considered.

The B2-SUB is a dual mode 2 × 18" double band pass subwoofer, configurable either for infrabass with the C4 system or as a high output alternative subwoofer. When used with a C4 system, d&b recommend a ratio of four C4-SUBs to one B2-SUB. The B2-SUB cabinet is constructed from marine plywood and has an impact resistant paint finish. The front of the loudspeaker cabinet is fitted with a rigid metal grill, covered with a replaceable acoustically transparent foam and fitted with catches at the top and bottom for securing an optional transport lid E7911. The cabinet incorporates eight steel handles and four heavy duty wheels. Mounted on the rear panel is an EP5 connector.