I make a lot of use of zone 2 in my AVR300 and find it works very well but the Analogue connections and composite are a bit restrictive. Currently I don't use the video switching and use a seperate DAC and Dolby Decoder to enable me to hear 5.1 downmixed sound downstairs. Rather then updating the AVR400 / AV10 to have 2 sets of DACs/DSPs and a HDMI output for zone2 (which is a niche and would add cost to the units for features others wouldn't use) I would like a special zone box. The AVR 400 / AV10 would have a zone connector where the zone box hooks in. Each Zone box would have the required DAC and a DSP for processing the sound, plus the required logic for doing OSD for that zone. For its output it would have a set of audio preouts and the required video preouts, also present would be IR In / IR Out and 12v Triggers. They may have there own inputs (which probably wouldn't be selectable in other zones?) which could be used for IPOD / Game console connections in that zone. Control of the zone boxes would still be through the AVR, essentially the zone 2 button could be used to cycle through all the connected zones. The menu would need some work especially if you wanted to set level and delays uniquely per zone. You may also be able configure each zone boxes on its own as it would have the OSD. In terms of form factor these zones boxes could come in 5.1 or stereo (to reduce cost) and maybe as audio only (although it may be easier to use the current zone 2 on the receiver as an audio only zone.) One possible for factor could have a stereo zone box integrated into a P35 or P90 (a powered zone box.) The number of zone boxes becomes tricky. Ideally each zone would piggy back of each other however this works easier on a digital connection (where a high bandwidth LAN could pass all digital signals, if you could sort out the jitter) rather than analogue ones. The trick would be to add minimum cost to the AVR and all the extra cost to each zone box so every one had this option but if you wanted to use it it you would have to pay a premium for it. Its probably unrealistic but it seems a nice way to build a real high end multi zone system.