The 1000 is very much alike the 500 regarding performance, with the advantage of providing about 1000 W of maximum absorption. Its use is slightly more specialized, being best suited for power amps or integrated amps rather than with sources or preamps. Another very good field of application for the 1000 (alike its bigger sibling, the 2500) is with electrostatic speakers or OTL amps.
As for the 500, the 2500 or the MiniBlack, the 1000 may be used as the only filter in a audio/video setup, eventually connecting to one of its outputs an energy distributor (see Four, Six, Eight - Derive!), but keep always in mind that the best results (more so if your setup needs so many Watts) are obtainable with multiple different filters specialized for each audio component.