“Sci-Fi” for sci-fi movies? “Music” for musicals? Honestly, I find that info to be nothing but useless cliché.
Back in 1986 or so Yamaha originally created the DSP modes for music listening. The idea was to mimic the acoustics of different real-life venues (and they even let us know exactly what and where some of them were) so that you would almost feel like you were really at that place while listening to your CD or whatever.
Home theater came down the pikes some years later, and Yamaha started adding DSP effects to Dolby Pro Logic (and later Dolby Digital, DTS, etc.) processing. But as far as I’m concerned, Yamaha’s original vision for the music DSP effects still holds for the movie DSPs. Basically, they are there to mimic an acoustical space. So if you want to watch your movie “in” a large theater, use the Spectacle setting, as it is the most “echoey” and therefore sounds the most like a large theater. “Adventure” has a “tight” sound and sounds like you’re in a small theater. And so forth.
Room Size increases the apparent “size” of the “room” that the effect is mimicking. I used to mess with a lot of the parameter settings back when I first started with Yamaha’s DSPs, but eventually found little use for them. The parameter adjustments adjust (obviously) the parameters of various aspects of the effect, if don’t quite like them. Like, maybe the decay time is too long or short for your taste. I eventually figured out that it if you don’t like the way a certain effect sounds (“Adventure,” or “Jazz Club” for instance), it makes more sense to just find another one you do like, rather than endlessly tweaking the former to “whip it into shape,” as it were. There are so many effects to choose from, it’s no problem to find one you like.
In the end, about the only parameter I adjust is the Trim level, which gives less or more of the effect. IOW, find the effect(s) you like and adjust their levels up or down to suit your tastes. Pretty straightforward.
Regards,
Wayne A. Pflughaupt