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In Reply to: RE: Great pics! posted by Barry on July 16, 2016 at 00:10:01
Well, it seems not much. :-))
The guy who provided my subs and programmed the miniDSP unit (using REW and a calibrated mike - lots of sweeps!) said that the room certainly didn't need any bass traps. Which - happily - means that it is pretty well behaved.
When planning the room I used a THX Excel spreadsheet which I have, to calculate the optimum room dimensions - optimum relative to the one dimension which was fixed, due to Victoria's Planning Regulations. The listening room is on what you call the 3rd floor (with Ground being the 1st floor) and, in Victoria, in inner-city neighbourhoods, as you go up, you need to set further back from the boundaries. So 3.6m depth (12') was the critical room dimension - yes, very small! :-(( - so the width is 5.8m (19') and the height 2.8m (9.2').
The floor is carpeted, furniture is a 3-seater couch on the opposite wall to the Maggies and 4 other chairs:
The painting on the wall behind the couch is designed to stop 'slap echo' - I made it in 1989 for the last house ... it is made of 1" thick cork sheets as the backing, with 1/4" cork for the 'objects'. So it acts as a slightly absorbant covering on the rear wall.
What we saw on the REW graphs resulting from the sweeps was a few peaks ... so, yes, Paul reduced these. The net result - taking advantage of the miniDSP unit's ability to set the output level for each driver - is that I have a pretty flat response form 20Hz upwards! :-))
Regards,
Andy
Follow Ups:
How closely did you get the impulse respomse of the system to a single spike?
Sorry, don't know. I can't remember Paul doing this but I can ask him.
What frequency should this single spike be?
Andy
The impulse response is a time alignment measurement it does not have a freq.
Here is one for the Vandy 2Ce, a time aligned design.
Of course that's a near field speaker impulse response, not one for a room but maybe that's your question.When used for room measurements, IR does not show room modal effects at different frequencies so you don't know what frequencies are problematic by looking at it.
Edits: 07/18/16
I am not interested in room IR but driver integration and phase issues. Short time window in the listening area. Ideally the speaker would provide reproduction of a square wave as Dunlavy liked to demonstrate with his designs. In my mind, FR squiggles are small change and the $$ are time and phase coherence. Dynamic capacity and extension and ultimate spl are also more important in my book. Since DSP is available to fix these things in a speaker along with the room- see DEQX- that is where I want to see it applied successfully.
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