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Thread: JBL Synthesis - Room Design and Treatment

  1. #16
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    Quote Originally Posted by boputnam View Post
    Is that L x W x H?

    If so, the JBL Room Mode Calculator shows the imbedded image. There are weak clusters at ~50Hz, ~100Hz and ~158Hz, but not so bad.

    But, since you are doing all this advance planning you really should check out the Room Reverb / Sabine Calculator and Charts site and work through your possible RT60 using Sabine values of various wall/ceiling/floor materials. You could end-up with a really sweet place.

    As well, Linkwitz has some great stuff, and a Room Mode calculator, too. However, my quick model of your ratios shows you are WELL ahead of the game! Nice!
    .
    .
    Thanks for the insight, Bo.

    The front distance is set by the physical imitations of the house construction. I'd have to do major excavation to widen it, since the bottom floor goes into the side of the canyon. So, 14' 6" is a given.

    The 22' 6" is somewhat arbitrary. I think I need to truncate the space and not use the full 32' length that's available, and I want whatever's left over to be useable.

    The 10' 8" height is tricky, because it's not that high down the entire length of the room. It's 8' 6" at the back of the room due to the three-tiered floor. It actually requires a more sophisticated model than just a normal room mode calculator.

    At this point I don't have access to anything that will let me model the actual room and, to be honest, I'm not sure I could understand it if I did. The alternative is to pay someone to do it, and the best estimate so far is $2500 and the worst is $6500. That seems like a lot, especially given all the other costs. That would buy a fair amount of room treatments.
    In.

  2. #17
    Administrator Robh3606's Avatar
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    That would buy a fair amount of room treatments.
    Who is doing the room treatments?? If it's a contractor they would have to do the analysis as part of it no?? How else would they be able to determine what you needed and where?? On paper great but at some point they would have to come in and actually measure the room.

    Rob
    "I could be arguing in my spare time"

  3. #18
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    Even though some of us (myself included) are shocked at spending $10k on construction, it's a general contractor doing the work. The LA area "HT specialists" want $40k+ and they don't mess with chumps like me. They can go down to Rancho Palos Verdes, over to Pacific Palisades, or down to the OC and find lots of folks willing to spend $100k or more for the Ultimate Home Theater. Frankly, who needs that ego stroke?

    Not me. This is, in effect, a DIY, be-your-own GC (general contractor) arrangement. I may live in SoCal, but I'm still a midwesterner by birth, inclination, and temperament. I've still got that can-do attitude when it comes to this kind of stuff. Once I pay for the system, the construction, the treatments, and the calibration, I have more time than money to get the rest of it right.

    I've been in contact with the acoustimac folks and am working with their service reps to put together an appropriate treatment package. They're very helpful.
    In.

  4. #19
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    I failed to mention that the contractor I hired built recording studios in the area. I visited two to see the quality and character of the work.

    Yes, I know recording studio ≠ home theater.
    In.

  5. #20
    Senior Member rdgrimes's Avatar
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    Quote Originally Posted by Titanium Dome View Post
    I failed to mention that the contractor I hired built recording studios in the area. I visited two to see the quality and character of the work.

    Yes, I know recording studio ≠ home theater.
    So next you'll be installing a floating isolated concrete slab.

  6. #21
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    Quote Originally Posted by rdgrimes View Post
    So next you'll be installing a floating isolated concrete slab.
    The floor in there is already concrete and the room is 100% below grade on two sides, 80% below grade on one side, and about 40% below grade on the other. I'm not interested in more concrete in there, floating or not. Plus the cost of a yard of concrete is out of sight.

    We're actually talking about a pair of floating risers in the seating area with a couple of THX subs underneath in the sealed space. Think butt-kicker extreme (switchable of course, because they serve no purpose in music).

    The room will have no windows and will have only two doors--one to the outside and one to the equipment room and emergency exit.
    In.

  7. #22
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    Wink

    Quote Originally Posted by Titanium Dome View Post
    ...

    Yes, I know recording studio ≠ home theater.
    You got that right!

    I was amazed at what passed for 5.1 setup at the last studio I wired. I setup 5 identical Genelecs on really nice stands, 3 along the glass in front of the console, 2 at the back of the room, along with the sub at the end of the console. Not really fine tuned, or EQ'ed in any way, just an approximation so I could test the speakers. The next time I tried to get in that room, it was already being used!
    Had to schedule the testing of the video tielines for after the current project was finished...

    BTW a powerful sub and a tone generator is a great tool for finding rattles in the room treatments, lighting, etc...
    Mike Scott in SJ, CA
    Drive 'em to the Xmax!

  8. #23
    Senior Member glen's Avatar
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    "before" pictures?

    Quote Originally Posted by Titanium Dome View Post
    I'm fortunate to have a pretty good room to put it all in, though there will be some modifications to the room and some new treatments to really bring out the best.
    Hey Dome,

    Looking forward to a detailed story of the travails and triumphs of your room reconstruction and system installation with lots of pictures and anecdotes.

    How about some "before" pictures of your room before it starts getting transformed.

    Hope the journey will be more than !
    glen

    "Make it sound like dinosaurs eating cars"
    - Nick Lowe, while producing Elvis Costello

  9. #24
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by glen View Post
    How about some "before" pictures of your room before it starts getting transformed.



    Widget

  10. #25
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    I think we need more pictures please more…there’s too much text.

  11. #26
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    After an extensive discussion with the contractor today, I've decided that what we're planning won't be quite good enough. So, we're revising some of the room dimensions, in particular the length to get better room ratios.

    Looking at a "normalized ceiling height of 9' 6", width of 14' 8" and length of 30' 4", we get pretty good numbers. Comments?
    In.

  12. #27
    Administrator Robh3606's Avatar
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    Looking at a "normalized ceiling height of 9' 6", width of 14' 8" and length of 30' 4", we get pretty good numbers. Comments?
    You are not using the "Golden Ratio's" are you??

    http://www.ultimateavmag.com/news/10388/index.html

    Rob
    "I could be arguing in my spare time"

  13. #28
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    Quote Originally Posted by Robh3606 View Post
    You are not using the "Golden Ratio's" are you??

    http://www.ultimateavmag.com/news/10388/index.html

    Rob
    Actually, the first two numbers (height and width) are very close to the ratios, but the third (length) would have to be 37' 9" which is 7' 5" outside the existing walls down there. I'm not going to excavate that much dirt, especially considering there are two floors above that would have to be supported while the foundation wall is removed. Na ga ha, Bar.
    In.

  14. #29
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    Plus, the Synthesis® marketing/engineering piece states that the $16,500 SDEC-4000 can handle any room, so we'll get it as close as we can to minimize the amount of calibration needed, then let the JBL tech handle the rest.
    In.

  15. #30
    Senior Member timc's Avatar
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    Quote Originally Posted by Titanium Dome View Post
    Plus, the Synthesis® marketing/engineering piece states that the $16,500 SDEC-4000 can handle any room, so we'll get it as close as we can to minimize the amount of calibration needed, then let the JBL tech handle the rest.

    Just tell them do punch in "Golden Ratio" on the SDEC. Might do the trick............


    -Tim
    2213 + 2435HPL w/aquaplas + H9800 (Matsj edition)

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