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imaging and speaker placement with tv in center

I have a long room 27 wide by 15 deep which is my music room (8' ceilings). I have my speakers 10 ft apart with the stereo cabinet (CWD lowboy) between them and slightly recessed from the speakers which are 26 inches from the back wall. My 36 inch behemoth Proton tv sits on the lowboy. The imaging is great, with soundstage larger than the speakers and at times depth farther back than the wall itself. I get pinpoint imaging that seems to eminate from where the tv is in the centered position.

The speakers are Von Schweikert Vortex Screens (somewhat similar to the VR4's) low driver 28 " off the floor and mids and highs mounted in separate cabinet section above. These speakers have a transparent nature to them, they sound like sound eminating in space, with no hint of cabinet coloration - even though they are 4.5 foot tall monsters. By walking around the speakers one can determine that they do not radiate sound off axis 90 degrees so I don't see that TV between them would interfere with the image, as it's slightly recessed back from the side axis of the speaker. Sometimes the cabinet doors are open for ventilation which could affect the imaging a little (I can always take these off, no spousal unit or gf to confound things cosmetically)

I am in a near field setup. Speakers 11 ' from me and 10 feet apart, 28 inches from speaker backs to the wall (speakers 14" deep). Speakers toed in an inch. My couch is against the back wall, so no back wall reverberation. The side walls are 9 and 6 feet away for cosmetic and traffic flow reasons.

I use the system primarily for music, but it also serves as a great two channel movie setup (not into 5 channel HT).

I have three questions
1) should/does the tv disctract from the imaging?

2) how far from the backwall?

I checked the archives for speaker placement and saw the Cardas setup. His depth to backwall calculation of width x .447 seems ridiculous or only applies to setups where the speakers are along the short wall. For my setup 27' x .447 says the speakers should be 12' off my back wall, or 3 feet from me. Or 6.7 feet if the width is really the short wall distance for calculations, still well out into the room

My setup seems to be very nice from an imaging standpoint, but I would like to fine tune things if possible. I don't have any special room treatments - carpeted, some posterboard music posters on side and back walls

3) does anyone have room placement formulas or recommendations for placing speakers on the long wall like my 27x15 setup? the cardas setup doesn't seem to hold here, except the equilateral triangle end

thanks

Tom
128x128audiotomb
blueswan
211 posts
 
After much experimenting, I have placed my Maggies as such, which is nowhere near the Cardas setup: tweeters on the inside, inner edge 44 in. from back wall, outer edge 48 in.
from back wall and inner edges 56 in. apart

I also use my system for 2 channel only DVD. My Sony HDTV in the middle disrupts the central imaging, but I have minimized the damage by carefully moving the TV 1/4 in. at a time. There is a spot about 32 in. from the back wall to the front of the TV where there was the least problem. It is not as good as no TV, but it was well worth the time of experimentation. With good source music, you should be able to place your TV in one evening. You can even use broadcast TV sound to double check, as its highly compressed center image is ideal for this type of test.
Good Luck!
audiotomb's avatar
audiotomb OP
1,112 posts
 
my system is posted in the virtual systems under
work in progress

cal, evs millenium, arc D200 and ls2 mk II

looking to upgrade the preamp to something serious
drrdiamond
671 posts
 
It sounds as though your setup sounds great to you, so why mess with it.
My room is 25X15 with large speakers (B&W800's). I originally set them up 5 ft from the back wall (using the "rule of thirds." My speakers are along the long wall, and about 9+ feet apart. My seating possition is about 1.5 ft from the wall behind me. The speakers and I form an equalateral triangle.
This is how I set them up 9 years ago, and although I have made many electronic changes, the system always sounded great, so the speakers have NEVER been moved.
IF IT'S NOT BROKEN, DON'T FIX IT
tom_nice
387 posts
 
I agree with the "if it's not broken ..." comment, but for whatever use it may be to you, I have a large TV set pretty well on the floor between my speakers, back from their plane about 1.5', and found that things improved if I put Argent Room Lenses (actually my own DIY imitations) in front of the TV. I found that two Lenses were better than one, so I made a 7-tube Lens, with tubes a bit higher than the TV. It's easy to move for TV watching, and did help the sound quite a bit. Reflections come from everywhere, roughly, and while you don't want to eliminate them completely, most do more harm than good, especially in a smallish room, I think.
sndsel
98 posts
 
Anything placed in the room can alter reflections - good and bad - including a TV between the speakers. But remember, the "image" does not exist between the speakers, it exists between your ears.
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