7.1 Speaker placement

Discussion in 'Speakers & Subwoofers' started by MichaelLT, Apr 29, 2003.

  1. MichaelLT

    MichaelLT Auditioning

    Joined:
    Jan 8, 2003
    Messages:
    10
    Likes Received:
    0
    Trophy Points:
    0
    I'm really not to sure where speakers are placed in a 7.1 surrornd sound. Any info would be nice or if you know of any web pages with info that would be great. Any diagrams would help.
     
  2. Kevin C Brown

    Kevin C Brown Producer

    Joined:
    Aug 3, 2000
    Messages:
    5,712
    Likes Received:
    0
    Trophy Points:
    0
    Surrounds: directly to the sides (90 deg each from the front). Rears: 165 deg from the front (or 15 deg each from the centerline in the back, 30 deg total spread apart). Height: tweeters 12 to 24 inches above your ears. That's for Logic 7 anyway. [​IMG] THX Ultra2 is similiar, but there is a provision in the software to actually allow the rears to be side by side in the back.

    What I've seen recommended over the years, anyway...
     
  3. MichaelLT

    MichaelLT Auditioning

    Joined:
    Jan 8, 2003
    Messages:
    10
    Likes Received:
    0
    Trophy Points:
    0
    Anyone know of a website that diagrams it out? I have bought a house that has 4 in ceiling speakers already installed. I am hoping I can use them in a 7.1 config. (My wife loves the fact that they are in the ceiling at not the wall) I am crossing my figures that they will workout some how and all I have to do is add a few more speakers for a good setup.
     
  4. BrianCli

    BrianCli Agent

    Joined:
    Jan 31, 2003
    Messages:
    26
    Likes Received:
    0
    Trophy Points:
    0
    I am very interested in this as well. I am in the process of building a house and I have wired for a 7.1 setup, but I am unsure on the exact placement of the speakers.

    Anyone have any diagrams???

    Thanks

    Brian
     
  5. Phil Iturralde

    Phil Iturralde Screenwriter

    Joined:
    Oct 7, 1998
    Messages:
    1,867
    Likes Received:
    0
    Trophy Points:
    0
    FYI: I am fortunate enough that I can follow the suggestion from Dolby Labs on-line document ... The Dolby Guide to Home Theater Sound in placing my original 5.1 HT speakers locations ...

     
  6. MichaelLT

    MichaelLT Auditioning

    Joined:
    Jan 8, 2003
    Messages:
    10
    Likes Received:
    0
    Trophy Points:
    0
    WOW, thanks alot.
     
  7. Kevin C Brown

    Kevin C Brown Producer

    Joined:
    Aug 3, 2000
    Messages:
    5,712
    Likes Received:
    0
    Trophy Points:
    0
    FYI, depending on your receiver/pre pro, that Dolby info is relevant up through Dolby Digital (THX Surround) EX (and ostensibly DTS-ES), but does not include any updated placement info for THX Ultra2.

    Here's some info for Logic 7, pg 32 is speaker placement:

    http://www.lexicon.com/downloads/fil...oduct=MC1&ID=5

    A couple extra points. They point out that if you place the side (surrounds) and the rears too high up, you lose spaciousness in the signal. If you've ever seen an on-axis/off-axis speaker freq response plot, you'd know that high freqs dive bomb in magnitude as you go off-axis. One reason why I believe that 36" above ear level is way too high. I used to have surrounds that high, now I have them about 12" above. Much prefer the latter. Better imaging, and a more accurate depiction of the original signal result.

    I have come to believe that the recommendation for surrounds/rears higher up are a remnant of original DPL type processing and movies, because it was mostly ambient material in the surrounds. But as technology has moved forth to DD/DTS then to DD EX/DTS-ES, *and* as movie soundtrack producers have incorporated more spatially relevant cues into the surround channels, it makes sense to drop those speakers down some. Plus, if you do any multi-channel music listening at all on your system (especially SACD/DVD-A), you'd want the improved imaging that results when you lower the surrounds (& rears).

    But experiment! Everyone has to judge for themselves what works for them in their own room! [​IMG]
     

Share This Page