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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: perhaps it IS the proximity to the speakers? posted by BS64 on December 13, 2010 at 13:49:50:
Drywall doesn't absorb much at high frequencies but it absorbs some and is less reflective at those frequencies as a result.
Toe in depends a lot on room and placement. If you have the speakers pointing right at you, you'll hear more high frequency content in the direct sound than if you have them pointing straight ahead down the room and are listening off the tweeter axis. Is the high frequency balance more to your liking with the speakers firing straight ahead rather than pointing at you? If so, then I expect that you may find that leaving them that way and using absorption at the first reflection points solves your high frequency problem and gives you your centre image. You need to experiment. You can also experiment with intermediate amounts of toe in.
If you simply change toe in with the speakers in their current position and face them down the room, what you're going to do is move the direct sound more off axis and the move the side wall first reflection more on axis compared to the situation with them toed in facing you. That will reduce the high frequency content in what you hear but you say it weakens your centre image. Moving the speakers closer together will move them further from the side walls. If you face them down the room in that position you'll get the same axis changes as facing them down the room in their current position, but to a slightly different degree for the direct sound and the reflected sound, and you may get a stronger centre image because you're also shortening the direct sound path and increasing the first reflection path, weakening that reflection relative to the level of the direct sound. That may give you an acceptable high frequency balance and strengthen your centre image without the need to treat the side wall first reflection points. That's also worth trying but you may find you prefer the speakers further apart. You really need to try these sort of changes out to see what the result is and whether it gives you what you want.
The sloping ceiling may or may not be a problem. I think there's a fair chance that you won't get a first reflection from it but checking that is going to be awkward. What you need to do is sit in your normal listening position facing backwards so you can see the ceiling and get someone to slide a mirror over the ceiling surface. If you can see the drivers in the mirror at any point you've identified a first reflection point. Trying to do a scale drawing and seeing if you can find a reflection path that way is going to be very awkward because of the fact that the reflection plane will itself angle over the sloping surface at an angle and you'd really need 3D modelling software to try and plot the path theoretically. My feeling is that because the slope peaks behind you, you won't get a first reflection from it. For that reason I'm not as worried by the sloping surface as you are and I think it may even be a plus for you rather than a negative. I don't think toe in will affect the reflection paths from the sloped surface.
I wouldn't try treating reflection points until I'd explored placement options. Get the best sound you can without treating reflection points and then refine that result with treatment if necessary.
David Aiken
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Follow Ups
- RE: perhaps it IS the proximity to the speakers? - David Aiken 23:13:43 12/13/10 (1)
- RE: perhaps it IS the proximity to the speakers? - BS64 07:17:31 12/14/10 (0)
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