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  1. #1

    Member Sales Rating: (0)

    Join Date
    Jul 2001

    Default TC80i DIY Enclosure - Need Input - Cabinet Design

    I just purchased a pair of TC80i in ceiling speakers at HiFi Buys for $230 for the pair! (They are going out of business). I am in a rental house awaiting construction of a new one. I would like to enjoy these speakers now, but can't cut holes in the ceiling. Do you have any suggestions on a DIY enclosure for these? I know Polk sells a pre-construction type enclosure, but I am looking to build a standard rectangular type speaker cabinet.
    My specific questions are:
    How many cubic feet?
    Ported / Non-Ported? (I assume ported)
    Length and diameter of port? (Crutchfield sells some standard (car audio)ones I have used with decent results in the past.)
    How much poly fill? Do you jam as much as will fit or just enough loft to insulate the enclosure?

    Thanks for your help,
    Mitsubishi WS-55819 HDTV
    Samsung SIR-T160
    Denon AVR-3802
    Denon DVD-1600
    Monster Power HTS3500
    Sony CDX-400 Disc Changer
    (2) RT 800i
    (1) CS 1000p
    (2) Cerwin Vega HTS15 15" 200 Watt Subs
    (4) RT 12 (all w/ trilaminate tweeter upgrades)
    (2) LS/FX

  2. #2

    Member Sales Rating: (5)

    Join Date
    Jul 2001
    Paris, Arkansas


    I don't know much about those speakers, other than what I just read on the Polk site. I can't see anything about an actual enclosure: I think they're designed for infinite baffle use. IOW, they use the space in the wall, between the studs, as the enclosure. If that's the case, they need a pretty large conventional enclosure to be tuned optimally. Of course, you don't have to shoot for optimal, especially if it's only temporary. I think you might get by with putting them in about a 1 cu. ft. box stuffed lightly (full, but not packed) with Dacron. I wouldn't try to port them. I'm just guessing though. You could probably call customer service and inquire about it. I'm sure Ken Swauger could help you, or at least tell you whether or not it would be worth the effort.


  3. #3

    Member Sales Rating: (4)

    Join Date
    Aug 2003


    jcaut nailed it.

  4. #4

    Member Sales Rating: (19)

    Join Date
    Aug 2003
    Kansas City KS/Central IA


    My girlfriend had a brick wall in the back of her living room, and I used one of the Polk inwalls in a box for the rear center channel of her 6.1 system. I made a box the width of a stud bay out of 1x4 oak, and long enough to mount the inwall speaker. I used a piece of 3/4" MDF for the back of the box. I glued some dacron batting to the sides. I did put two small 1" holes on the top and bottom for venting. Not sure if I needed the vents, but it sounds just fine for the rear center channel.
    HT System: LSi9, LSiCx2, LSiFX, LSi7, SVS 20-39 PC+, B&K 507.s2 AVR, B&K Ref 125.2, Tripplite LCR-2400, Cambridge 650BD, Signal Cable PC/SC, BJC IC, Samsung 55" LED

    Music System: Magnepan 1.6QR, SVS SB12+, ARC pre, Parasound HCA1500 vertically bi-amped, Jolida CDP, Pro-Ject RM5.1SE TT, Pro-Ject TubeBox SE phono pre, SBT, PS Audio DLIII DAC

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