I was trying to combine it with some CD racks in a basement. Basically still try to do some absorption of reflected waves after they have traveled to the back of the room while still applying a similar concept to reduce reflections from the back wall reflecting back to the listening area.
I was doing some tracing yesterday and as you can see from the attached image, by doing little more than extending the flat baffle out until it touches the side and rear walls I could be redirecting the rear and both sides.
You have the plane of your reflector sheets pointed back at the speakers, ie. they are not broadside toward the speakers, is this correct?
I would have assumed the opposite, but then that would produce a Freznel style reflector (with frequency limitations) and I guess yours wouldn't be acting that way?
Attachments
Don't be in such a hurry! I studied the paper while traveling, I need to look again.
While I do like the concept - and my room is of a very similar size - but I ain't sitting anywhere near that close. So I'd have to figure out how and if it would work for my listening position in my room. I do not want to sit that close to the speaker wall. Would you?
Yep, the free demo of ARTA will measure and plot ETC. You can't save the original impulse response to a file for later re-use (without registering) but you can copy and paste any number of ETC curves from the current measurement as image files without limitation.
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Was dave asking for software to measure ETC of actual rooms, or to predict it from simulations ? I'm confused...
REW shows ETC and is a freeware. It has all the features one need for small room acoustics.
REW - Room EQ Wizard Home Page
A comment to what was said earlier. Localization error will happen no matter how the recording is if the room has a complete dampened rear wall. It doesn't only sound unatural because it's dead, but it's also incorrect due to how we perceive sound. This has been known for a long time.
REW - Room EQ Wizard Home Page
A comment to what was said earlier. Localization error will happen no matter how the recording is if the room has a complete dampened rear wall. It doesn't only sound unatural because it's dead, but it's also incorrect due to how we perceive sound. This has been known for a long time.
If by "rear wall" you mean the wall behind the speakers, then your comment is contrary to both my experience (I do precisely that) and Floyd Tooles (see his book).
For measurement of actual rooms. I want to see what my 2 rooms measure like and then see how practical it is to deal with particular reflections.
David
I can't find anywhere in Holm to generate ETC graphs.
While I agree Holm is a great tool if your budget is "for free", it really can't compete with ARTA in either functionality or usability.
ARTA has a full suite of room acoustic measurement tools that Holm lacks, and for measurements that both programs can do I generally find ARTA does a much better more accurate job of it and is easier to use.
The free version just prevents you from saving impulse response measurements permanently to a file - not something that's really an issue for a quick test proposed in the thread - it will still let you take a measurement and generate any ETC (or other) results from that and save the end results including copy/pasting graphs into jpeg/png. (You just can't go back later and generate more results from the original measurement once the program/impulse response is closed, unless you re-measure)
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