Sorry for the long delay on replying, I've had a busy week.elastic wrote:Super Dan, thanks for such a detailed reply. It always helpsAnd your thread looks ace. It’s a lot easier to understand with pictures and when someon explains it.
Been a week off from the project so just getting back into it now.
Does the HVAC unit have to be in above the ceiling?
Also, forgive my lack of knowledge, but what is an inside out ceiling?
Thanks
You can put your silencers and HVAC ducts wherever you want/can fit them. It could be useful to save space by putting silencers inside the speaker "soffits", if you're flush mounting your speakers. Some people put the ducting/silencers along the inside top corner of the walls.
It doesn't really matter where you put them, as long as you design them correctly and keep the room symmetrical (definitely in front of you, and preferably behind aswell).
An inside out ceiling, is based on John's (John Sayers, you're on his forums
) design. It can be used on walls and ceilings. When you frame a wall, instead of putting the plasterboard on the room side of the frame, you put it on the cavity side of the frame. This leaves the framing exposed to the room, which is a ready made framing to support your acoustic treatments. You can put mineral wool /glass wool in this framing and face it with slats to build tuned helmholtz all over the room (John's signature design), or leave it exposed as absorption, and/or combine the two. You can see the design in John's construction guide here:
http://johnlsayers.com/Recmanual/Titles/Acoustics3.htm.
He calls it "My Wall", as this was written before the term "inside out walls" was coined.
Dan