Center channel placement...for those without AT screens lol! - AVS Forum
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Old 04-01-2014, 10:21 PM - Thread Starter
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I just got my JTR Triple 8 LP (low profile) from MKtheater this week. I have been running 4 channel with a phantom center with my JTR Triple 8 HT's (difference is ported model). But my wife and I sit 9ft from the screen and about 12-18 inches to the left and right of center. It is now nice to have the sound coming from the center once again! The BD demo discs have gotten plenty of exercise as we have tested numerous scenes. I do notice the sound coming from below the screen although it is not bad. But I am a perfectionist and if making a stand and putting it above the tv will yield better results I will do it. Again I am not disappointed as it sits now and cosmetically and felling safer about it not up so high are two pluses. So I turn to you all for your advice and comments from your own experience. I know perfection would be an AT screen but it's just not a possibility currently.

Also currently the center sits on a surface even with the surface of the couch, maybe a touch higher once you sit and sink in. so it is only like 12 inches below dead center and matching the LR mains






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Old 04-02-2014, 10:13 AM
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You can try lowering the mains so the sound is all coming from the same height. Angle the speaker to just above your ears as well and see if that helps.

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Old 04-02-2014, 08:24 PM - Thread Starter
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it actually is firing about a ft over my head

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Old 04-02-2014, 08:25 PM - Thread Starter
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i actually think it is fine where it is. Sounds pretty good smile.gif

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Old 04-02-2014, 10:31 PM
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Quote:
Originally Posted by jlpowell84 View Post


Hi jlp

I reckon what will yield better results is if you pull the centre as far forward as possible on the entertainment unit - even to the extent that the speaker baffle is beyond the leading edge of the unit, if possible. Currently, you will be getting reflection and interference from the glass surface in front of the speaker. Because of the way midrange and bass frequencies propogate into the room (see below), it's these frequencies that will be interfered with. With the centre moved, you should notice things like improved clarity of voices/vocals and more coherent/fuller upper bass, giving you more feel or "punch". Many musical instruments have their fundamental frequencies spanning this upper bass/lower midrange. The centre content might actually "lock in" to the screen action better too. Of course, re-run Audyssey to optimise your results.


If the centre is firing a foot over your head, you perhaps don't need the wedges or that amount of uptilt. I think pulling the speaker all the way forward will achieve what you're trying to do with the wedges anyway.

BTW: If your bride is anything like mine, she may hate the look of the speaker pulled right forward ("It looks silly!")... some compomise may be required. I generally have mine back at a WAF distance for casual TV viewing etc, but pull them forward to "attack position" for serious listening or movie watching. Audyssey is based on the latter position. More often than not, I "forget" to push them back. biggrin.gif

[BTW #2: I love the look of JTR's LP versions... I think it's that the baffle is chock full of drivers!]
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Old 04-03-2014, 12:02 AM - Thread Starter
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Thanks for the response! I will dissect this info and do further testing for sure! I guess if it sits physically farther forward than the LR mains that won't matter since it's all properly delayed in the distance settings! Sometime we need the obvious stated to us!

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Old 04-03-2014, 07:20 PM
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Yep, the distance setting will sort it out.

Actually, my audio OCD would have me placing the T8's square on the front edge of the Submersives (?) and toeing them in as one. That's perhaps getting a bit silly though!

Seriously, when your done I'd be very interested to hear your take on the SQ changes the centre adjustment makes.
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Old 04-03-2014, 08:23 PM - Thread Starter
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I will report back for sure! Do you mean toeing in the submersives as well? So that the LR mains would be square with the Submersives toed in together? So I have the evening alone to calibrate. So Even with pulling it forward I will need to prop it up at least a little or else it will fire into my waist area.

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Old 04-03-2014, 09:36 PM
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Yep, but not for the purposes of toeing in the Submersives per se... just so the LR mains don't have a triangular shaped ledge in front of them. Like I said - a bit OCD on my part! It can't hurt to try though. biggrin.gif
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Old 04-03-2014, 10:51 PM - Thread Starter
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Ok here is a quick pic of the CC movement. I also pulled the Submersives out about 3.5 inches from the wall and slightly moved out the LR mains as far as they would go. Small portion of the back corner is hanging off the sub's. I would like that OCD look too but my room is so small! About to listen to movies after calibration here...







What do you think about a small little Roxul AFB pad for the CC to sit on? Not worth it at only 2 inch thick?

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Old 04-03-2014, 10:52 PM - Thread Starter
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I would say the CC is now aimed directly at the chin area...

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Old 04-03-2014, 11:19 PM
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That's lookin' good jlp. The Roxul pads are worth having there I reckon.
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Old 04-03-2014, 11:22 PM - Thread Starter
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This weekend I am building my wall panels so I could easily construct a pad for it. Only 2 inches but it won't hurt and will technically raise it up a touch.

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Old 04-07-2014, 07:26 AM
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Wow! That's a lot of speaker for a small screen! When I got my first surround setup I was still using a computer monitor to watch movies. Soon after I bought a barco crt on ebay and built a screen. Now I have a 5' x 10' screen and the sound coming from the bottom of the screen issue was awful. After trying top vs bottom, I found that top+ bottom was much better. The angle of each is pretty important. moving forward and backward in the room you will notice a change in the perceived location of the sound. If you have multiple rows of seating this may not be ideal. For many years this was an adequate solution, Now I have two height speakers that are simply outputting the center channel information. I do not have Dolby plIIz or DTS neo:x so they are not true height channels. I find this works very well and does a better job throughout the room. If you have a 9 or 11 channel avr the height channels do have a dialog height setting that sends a percentage of the center channel to them. Raising your screen and center channel might help as well. I will be interested to hear what you will do. Have fun!
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