6x4 zone processor for BGM applications. 4 mic/line inputs + 2 line inputs. Advanced Feedback Suppression©, Autowarmth©, auto gain control, compression, limiting, noise gating, notch filtering, bandpass and crossover filters, parametric EQ, security lockout, wall panel control. RS-232 and Ethernet control. 641 is the same as the 640 but without front panel display.
