help me

Hi, I am new to this forum and this is my first posting. I am planning to build a large home theater with 30 theater seats, configured in 4 rows (8/7/7/8), in a room 26 feet wide by 35feet long with 10 feet ceiling height. Given the length of the room and the 4 row configuration, I plan to go with 4 side surround speakers (instead of the typical 2) to ensure that all 4 rows are filled with a full presentation of surround sound. With this goal in mind, I have 2 sets of Polk FXi5s for the side surrounds which will be driven by an outboard 4 channnel amplifier. My question is, given the 4 row configuration and size of the room, where should I locate the 4 FXi5 relative to the 4 rows? Should I set the speakers for Dipole or Bipole or a combination of the two? Should I configure the second set of FXi5s such that they are reverse sides from the first set? Are 2 sets of FXi5s unnecessary even for a room of this width and length?
I appreciate and value all viewpoints.........Regards, Merlin


  • treitz3treitz3 Posts: 12,627
    Hello, Merlin. Please allow me to offer a very warm welcome to Club Polk. Happy Thanksgiving! While I would love to help you out with your query, I cannot due to me being a 2-channel type guy. I can offer you a warm welcome to the club.

    In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence.

    The best way to enjoy digital music reproduction is to never listen to good analogue reproduction.
  • lightman1lightman1 Posts: 10,006
    Way to fail, Tom......

    Welcome aboard, Merlin!
  • msgmsg Posts: 4,372
    Way to fail, Russ......

    Merlin, let me be the third to welcome you on!
    I disabled signatures.
  • lightman1lightman1 Posts: 10,006
    @ZLTFUL ...... He's hip to the HT gig.

  • EmlynEmlyn Posts: 2,184
    If going to that kind of expense I would consult with a good custom installer. It is possible to set up a system with more than one pair of side surround speakers with signal splitters and extra amp channels, but there are a number of issues involved with doing it well that a professional can best handle. Normal home theater gear is not built to process sound optimally in a space that big and with 30 seats in it without workarounds and customization. I would also suggest that the Polk FXi speakers may not cut it for that type of space.

    Of course, it may be more expensive than you are planning on now.

    Check out threads on AVS Forum for some ideas. The question comes up there occasionally.
    1. Polk LSiM707, 704C, 703; Dual SVS SB2000 subwoofers; Marantz SR7011 receiver; Parasound A23 amp; Oppo 205; Toshiba HD-DVD Player; Sony 65" 4K TV; FIOS; PS Audio Power Plant Premier; MIT S2 cables
    2. JM Labs Electra 920.1; Parasound JC2 Preamp; Sonic Frontiers Power 2 amp; Sony HAP-Z1ES; Oppo 105D; Music Hall MMF7 and Acoustech phono pre; PS Audio P1000; MIT S1 Cables
    3. Polk LSiM703; Pioneer Elite SC97 receiver; Oppo 203; Squeezebox Touch; MIT S3 cables
  • ZLTFULZLTFUL Posts: 4,747
    I am with Emlyn...consult a professional installer.

    Multiple side surround "layers" are going to require something beyond your average AVR/surround processor. It will require you to move into the realm of individual channel DSPs and the like such as Motu working with JRiver Media Center or the Mini DSP Dirac units.

    If you just split signal and run the extra channels, whatever room correction you are using is going to butcher the correction algorithms due to it expecting a single signal from a speaker location and instead getting 4 separate locations to try and "correct".
    "Some people find it easier to be conceited rather than correct."

    "Unwad those panties and have a good time man. We're all here to help each other, no matter how it might appear." DSkip
  • lightman1lightman1 Posts: 10,006
    How about a 9.2 channel AVR with pre-outs? Spitballin' here....
  • deronb1deronb1 Posts: 4,378
    I would position the side speaks between the rows, that way you could go 11.2. Plenty of options there, unless you are thinking Atmos. You are going to need big powerful subs to pressurise over 9k cu/ft.
  • FestYboyFestYboy Posts: 3,119
    7.2.4 through a pre/pro, delay the LCR and front hight, and delay the first row of sides by a little less, then run the rest as is all before the main amps.
  • ZLTFULZLTFUL Posts: 4,747
    You would still need something like a MiniDSP to create the delay separate from the side surround "initial" signal.

    AVRs and pre/pros 7.2, 9.2, etc are still only going to have a single side channel output.
    "Some people find it easier to be conceited rather than correct."

    "Unwad those panties and have a good time man. We're all here to help each other, no matter how it might appear." DSkip
  • FestYboyFestYboy Posts: 3,119
    I was assuming a side split signal out of the pre/pro, then into a simple delay box for the "forward" channels pre amplification
  • Viking64Viking64 Posts: 3,673
    Whenever I see the title of this thread, I think of Nine Inch Nails.
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