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For precise filter frequency information refer to Appendix B (page 15). Multi-Amplifier SYSTEMS Using the “Preamp Outputs” of the XD400/4, it is easy to configure many different multi-amplifier systems. The most common type involves the addition of a subwoofer amplifier, such as the XD600/1. Common configurations of such a system are described below. Bi-Amplified System with one XD400/4 in four-channel mode and a separate subwoofer amplifier This configuration requires that the separate subwoofe