DBX 640 6x4 Digital Zone Processor - 6 Inputs, 2 Mic/Line + 4 Stereo Line w/ Front Panel ControlThe ZonePRO 640 from dbx is a digital zone processor that features six channels of input and four outputs. The unit is suitable for installation in restaurants, fitness centers, retail stores, nightclubs, and any other situation that requires multiple zone control of audio sources with paging features. The ZonePRO 640 has limited front panel control, but both it and the ZonePRO 641 (same features, but with no front panel control) require a computer