The ideal auditorium? Blank canvas


I am placing this under "Speakers", since it's all about building an auditorium that will become one with my speakers.

I have the opportunity to build a small auditorium in my garden (in Christchurch, New Zealand). This will be a house with one empty area for my audio and CD collection. It will be designed to be used only by myself, and maybe the occasional visitor.

My current music room is 4x3M, and I find that too small (acoustically). However, building an auditorium slightly smaller (max. 10m2) presents a huge advantage: there is no need for building consent and red tape...

I am using a pair of New Zealand built Image 414 http://www.imageloudspeakers.com/products/414.asp loudspeakers with a matching subwoofer http://www.imageloudspeakers.com/products/sub10.asp , powered by a Sony TA-FA3ES integrated amplifier - a combination that is very satisfying. I listen exclusively to classical; subwoofer helps a lot with organ, but is necessary in some other cases only.

The auditorium must be built with potential future uses in mind. It will have water connections for an eventual kitchen and bathroom. Whatever shape I give to it, it must be easily converted into accommodation / office later.

Since I have a blank canvas, what is your advice on:

- Ideal size, proportions (square? rectangular? other shape?)

- Ideal floor (carpet over concrete? over floating wooden floor?)

- Floor height? Should I plan a sitting area higher than the speakers?

- Ideal walls?

- Ideal height?

I suppose the ideal shape will be symmetrical.

Any advice would be appreciated. I plan to draw plans which I would publish here.
waryn
Mapman
Most room furnishings that can help a room sound good is not marketed to audiophiles and sound engineers!
That is definitely music to my bank account!

Plans will be underway and I should able to post them here in 2-3 days.
Waryn,

The wall construction that I described was from the HT room in my former home. Those walls were, unavoidably, parallel. However, that formulation can be done at reasonable cost (depending on the materials chosen) and it sounds and looks great. It's even better visually for in-wall speakers. If you want to consider double duty for 2ch/HT use (main L/R on the floor, center/ back/sides/subs in-wall), I'd probably do it that way even if the walls weren't parallel. For a strictly 2 channel room with non-parallel walls, maybe it's overkill.

Marty
Ok, what do you think of this first plan? - The original Golden Trapagon appeared too big for me, so I have reduced the horizontal dimensions by 25%... but now, it appears too small, doesn't it? What do you think?
Waryn,

I suspect that you'd regret not enlarging that floorplan. If you start with a minimum width of +/-425 and go from there, you'll probably be closer to the mark. You can probably get away with less flare to the side walls (smaller maximum width) if that is helpful.

BTW, if that's record racking behind the speakers, I'd also suggest that you stagger the depth of the racks, pulling some sections closer to the listener than others. IME, this is a great wall treatment. Similarly, you may want to put some racks (or decorative pilasters) flanking the doorway on the wall behind the listener.

Finally, while the ceiling arrangement looks good, you can also get away with drop panels of varying depth if that proves easier/cheaper.

Good luck

Marty

PS If you haven't purchased the subwoofers yet, you may wish to consider this approach:

http://www.audiokinesis.com/product_ak_swarm.html

I'd give Duke (the manufacturer of this system) a call to discuss. He's a very good guy who participates here regularly.
I should add that Duke (Audio Kinesis) also sells this less expensive variation of his multi-subwoofer set-up.

http://www.audiokinesis.com/product_ak_sealedswarm.html