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In Reply to: RE: Can you post a picture or 3? NT posted by rw11 on April 26, 2017 at 14:06:18
Thinking of how to distance the speakers from the front wall.
Yes, a nice large plant behind the left speaker will help balance things out, but you also need more distance to the front wall and that should do more together to get the speakers balanced and get the front wall reflections to lower level so they don't interfere.
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Thanks for all the help - esp. the taking the trouble to modify the diagram!
I am a little confused about distance to the front wall - I've always assumed that is for bass wave superposition to enhance the SPL for those frequencies, and does not affect the highs (much).
Right now, the tweeter is about 2 ft. from the wall (measuring at 90 degrees to the panel, not straight back across the room itself). The mid/bass panel's center is about 32" so just under 3 feet. If I put it on the added circle in the diagram, I should easily be able to get it at about a 5 ft distance from the corner of the 2 windows.
It seems like the distance form the front wall should depend on the room size, maybe the length. I guess I can move it back and forth to test.
I'm also trying to figure out the density and leaf size for a fake plant -- if it's not too spendy I can at least try it out and toss it when it gets dusty. (no real plants - had to replace the floors when they got wet from watering)
The rear wave from a planar dipole speaker is in reverse polarity to the front radiation. So the closer to the front wall you put it the weaker the bass. The reflections from the front wall in the mid and high frequencies are not well separated from the direct radiation by the ear till the reflections are delayed by 1ms or more. That requires that the backwave reflections travel to the fron wall and back to the plane of the speakers a distance greater than 10 ft. So the speakers need to be placed 5 ft or more from the reflective area on the front wall. It is less of an issue with severe toe in. But that adds in front radiation reflecting off the front wall, ,which is equally problematic.
Bass reinforcement by the front wall only works for box speakers. To get wall reinforcement of bass of a planar dipole you place it close to the sidewalls and dead perpendicular to them..
Do try it out to get your impression of what particular placement variation does to the speaker's performance. Keep notes and mark up the placements you try out.
There are particular placement schemes that rely on the dimensions of the room. But your open plan does not really make for a standard room. The right speaker in free space is getting a more favorable placement for mid and tweeter performance, particularly in detail resolution, the left speaker is getting some corner bass boost but otherwise it is having the mids and treble muddied with early reflections.
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