Ground Clearance

Early B.
Early B. Posts: 7,900
edited December 2005 in Subwoofer Hookup & Bass Management
I have a downward firing subwoofer and it's ground clearance is only about an inch from a carpeted wood floor. Should I be concerned about this from an SQ perspective?

Thanks.
HT/2-channel Rig: Sony 50” LCD TV; Toshiba HD-A2 DVD player; Emotiva LMC-1 pre/pro; Rogue Audio M-120 monoblocks (modded); Placette RVC; Emotiva LPA-1 amp; Bada HD-22 tube CDP (modded); VMPS Tower II SE (fronts); DIY Clearwave Dynamic 4CC (center); Wharfedale Opus Tri-Surrounds (rear); and VMPS 215 sub

"God grooves with tubes."
Post edited by Early B. on
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Comments

  • MacLeod
    MacLeod Posts: 14,358
    edited December 2005
    Personally I would want a couple more inches from the floor. For strict SQ purposes I dont like downfiring at all but for output purposes it works very well.

    You could always rig up something underneath it and raise it up a couple inches and see how it sounds to ya.
    polkaudio sound quality competitor since 2005
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    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D
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  • VR3
    VR3 Posts: 28,653
    edited December 2005
    Early...

    Assuming you are going high excursion (sometimes greater than 1" one way)

    I'd want, minimum of 1" of extra clearance...

    So if you got a 25 MM One way excursion - you want atleast 2" of space......maybe 3" - 1" may be pushing it...
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • Early B.
    Early B. Posts: 7,900
    edited December 2005
    Anybody know how much clearance the SVS box subs have?
    HT/2-channel Rig: Sony 50” LCD TV; Toshiba HD-A2 DVD player; Emotiva LMC-1 pre/pro; Rogue Audio M-120 monoblocks (modded); Placette RVC; Emotiva LPA-1 amp; Bada HD-22 tube CDP (modded); VMPS Tower II SE (fronts); DIY Clearwave Dynamic 4CC (center); Wharfedale Opus Tri-Surrounds (rear); and VMPS 215 sub

    "God grooves with tubes."
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  • VR3
    VR3 Posts: 28,653
    edited December 2005
    2" -

    Each SVS sub has around 2" of linear excursions, FWIW (so they have 1" extra space)
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • Early B.
    Early B. Posts: 7,900
    edited December 2005
    OK, I gotta get some new casters for my DIY sub. They're currently 2" so I wanna go with 3 inchers. The sub will be too tall if I go any higher (got it hidden nicely on the side of the sofa). I'd love to throw a concrete slab underneath, but the "pretty police" not approve.
    HT/2-channel Rig: Sony 50” LCD TV; Toshiba HD-A2 DVD player; Emotiva LMC-1 pre/pro; Rogue Audio M-120 monoblocks (modded); Placette RVC; Emotiva LPA-1 amp; Bada HD-22 tube CDP (modded); VMPS Tower II SE (fronts); DIY Clearwave Dynamic 4CC (center); Wharfedale Opus Tri-Surrounds (rear); and VMPS 215 sub

    "God grooves with tubes."
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  • VR3
    VR3 Posts: 28,653
    edited December 2005
    Early...

    Concrete Slab + Bed Liner = Cool
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • janmike
    janmike Posts: 6,146
    edited December 2005
    I used some 12" slate tiles instead of concrete. Solid and they satisfy the "pretty police" enough.
    Michael ;)
    In the beginning, all knowledge was new!
    NORTH of 60°
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  • Early B.
    Early B. Posts: 7,900
    edited December 2005
    Vr3MxStyler2k3 wrote:
    Concrete Slab + Bed Liner = Cool

    Hmmm. That'll work. I can match the color of the slab with the sub. The WAF won't have a problem with that at all. They love stuff that matches.
    HT/2-channel Rig: Sony 50” LCD TV; Toshiba HD-A2 DVD player; Emotiva LMC-1 pre/pro; Rogue Audio M-120 monoblocks (modded); Placette RVC; Emotiva LPA-1 amp; Bada HD-22 tube CDP (modded); VMPS Tower II SE (fronts); DIY Clearwave Dynamic 4CC (center); Wharfedale Opus Tri-Surrounds (rear); and VMPS 215 sub

    "God grooves with tubes."
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  • michael_w
    michael_w Posts: 2,813
    edited December 2005
    I've been told that for a downfiring sub it's best to have the height at which it is off the floor about 75% the width of the port. So a 4" port = 3" off the ground. That's what I used for my atlas 15 diy sub and it seems to work well.
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  • VR3
    VR3 Posts: 28,653
    edited December 2005
    Wouldnt that be if the port is down-firing too??
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • michael_w
    michael_w Posts: 2,813
    edited December 2005
    Yeah sorry I forgot to mention that part of the forumla... it is common to put the ports on the same side as the driver so I kind of assumed there.
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  • Early B.
    Early B. Posts: 7,900
    edited December 2005
    Since I have a rectangular sub, my ports are in the rear so I could make them a bit longer.

    I wonder if a 1 inch clearance increase will make a SQ difference. We'll see.

    BTW -- anyone know the sizes and prices of those concrete slabs that homeowners use to set their AC condensers on? I need one that's something like 20" x 32"
    HT/2-channel Rig: Sony 50” LCD TV; Toshiba HD-A2 DVD player; Emotiva LMC-1 pre/pro; Rogue Audio M-120 monoblocks (modded); Placette RVC; Emotiva LPA-1 amp; Bada HD-22 tube CDP (modded); VMPS Tower II SE (fronts); DIY Clearwave Dynamic 4CC (center); Wharfedale Opus Tri-Surrounds (rear); and VMPS 215 sub

    "God grooves with tubes."
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