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In Reply to: RE: Tips for building speakers for an open room posted by hollowboy on August 30, 2007 at 22:46:31
Hollowboy,
yes,the glass is bare. Imagine a big room of dimensions 16 long x 5.5 deep x 4 m high. One long side (16 long x 4m high) is bare glass. The other parallel long side (16 long x 4m high) is completely open, i.e. no wall at all. The two short sides, floor and ceiling are brick and very reflective. It is a large terrace facing a nice garden.
The speakers are intended for one half of the terrace, that is 8 long x 5.5 deep x 4 m high. This one half of the space is not separated in any way from the rest from the other half.
On the one half of the terrace where the speakers should be placed there are two large sofas and the system is intended for groups of people of about 5-10 persons. There should be good coverage in the whole half where people sit.
The mid-high speakers should be mounted/hanged from the ceiling. So the question is 1) how many speakers should be used, 2) how should they be positioned, 3) what is the highest xo freq. at which the mid-high speakers should be crossed over to the subs, and finally 4) how many subs should be used.
The needed SPL is not very high, but high enough to throw a party every now and then.
Follow Ups:
I'd still recommend that you take & upload a photo (start a new thread), and you will get better advice than mine, pro sound guys deal with these coverage issues all the time.
1) how many speakers should be used
I'd say a pair.
2) how should they be positioned
See my fine art :-)
The aim is to hear more direct sound from the speaker that is further away. This will give a reasonably balanced sound over a wide listening area.
3) what is the highest xo freq. at which the mid-high speakers should be crossed over to the subs
As low as you can manage, since the gap between the mid/highs and the sub(s) will be very large, assuming the sub(s) are at ground level.
4) how many subs should be used.
I'd say one would be fine, since it doesn't sound like a super-critical application... but more and bigger are always better, with subs.
==> something important you didn't mention is directivity / dispersion angle. I'd recommend that you do your own scale drawing to check (or use string lines to map out your terrace), but I'd guess 30-45 degrees of vertical dispersion would achieve my sketched coverage pattern, and 90-120 degrees horizontal (so you can get reasonable coverage out into the garden). Angle the speakers horizontally so that minimal sound "splashes" off the glass.
This type of directivity control cannot be achieved with a dome tweeter.
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