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Di-Poles and back wall reflections Stats

I have a pair of Innersound Eros Electrostats that are "Di-Pole" in nature, I have not had them that long and am still trying to get everything right. My room and wife make placement from back wall 32 inches at closest point, 8 inches from sidewall and toed in to my sweet spot. I have noticed some high pitch fatigue at moderate volumes so I thought to place my side wall reflection panels behind the speakers as I no longer have any issue with first reflections on side wall due to the beaming nature of the Innersound speakers.
I first placed the panels wich are about 24 inches square behind each speaker up towards the top of the speaker panel and the high frequency fatigue went away, but also some of the magic, it just seemed like a window got shut a little too far....so I moved the panels lower down the wall and it seems pretty good, the HF beaming fatigue is gone and the window seemed to open back up, but I am now wondering if I am doing the right thing by useing the reflection traps behind the speakers at all. Should I do nothing with the back wall or am I going to have to find a happy medium with some kind of treatment due to how close they are to the back wall? Anyone with similar experience or opinions please let me know what you think, and as always thanks again. Chad
chadnliz
gregm
3,406 posts
 
My personal stats indicate that 32" is a bit too close to the back wall (I know, the powers that be won't otherwise oblige).
{For that matter, so is 8" fm side wall -- at least in my room 177" wide: 40-50" side-wall to centre of woof is more like it}

The idea behind damping the HF back waves with "traps" is to simulate a larger distance. Problem is, yr traps are too small for a UNIFORM effect. Try out both traps behind one speaker and listen. ALternatively, you might suggest a curtain of sorts (dunno if that would go down well...)
tpsonic
1,092 posts
 
When Western Reserve Audio was a partner building tube amps for Innersound,I heard the EROS.It sounded good,but got a little overbearing,then we installed two pairs of the Walker Audio Ultimate HDLs.More relaxed,no signs of stress on high level transients and more liquid.These are available with return policy and used here on the Gon.Give them a shot.
newbee
4,767 posts
 
Don't know about WAF of putting dispursive (diffusing) materiel on the walls behind your speakers but that is what you need to do. You don't want reflective or absorbing materiel (obviously too bright or too dead.) You can use professional stuff or home brew depending on what your asthetics can stand.

I agree that side wall reflections shouln't be a problem when you speakers are toed in and you're sitting on axis, but you've got to pay attention to the back wave - that is what happens to it when it hits the back/side wall. You need to think about that as well as the back wall.

32" from the wall might be one of the problems with the highs being on the bright side, that is the sound is being reflected but the slightly different arrival time of the reflected sound and the direct sound is enuf to cause subtle distortion which 'sounds like' excessive highs. Thats one of the reasons that having them further out in the room is beneficial (as well as helping to create a greater sense of depth of image, probably for the same reason).

Who said setting up stat's was a walk in the park. :-)
creeper
251 posts
 
I thought that dipolars send out-of-phase sound waves backwards that reflect forwards off the rear wall and help to reduce/cancel in-phase standing waves. Am I way off on this? Somebody please educate me.
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