Re:Hitachi feature tool -
I haven't tried setting any of that stuff up. Seek noise doesn't bother me enough to make me get of my butt and do it.
maybe in the future.
The grill at the back is 92mm vs my 80mm fan. But using a 92mm fan would probably mean greater air flow for less RPMs. I don't know what difference it would have if the fan was not directed right at the HD. But anyway, maybe something for the future if I get the urge again. (and the time).
I had a look at some of the muffler info. Seems to require a lot of room/space. I guess turning the whole top 3 bays and section of the case into one big muffler/wind tunnel is possible, with everything (fan, HDs) mounted inside along with insulation foam/material. But designing acustic 'filter' sections is probably a bit beyond me. (And they consume a lot of space from what I saw.)