Tempest Response Curve Question

Discussion in 'Archived Threads 2001-2004' started by Steve Estabrooks, Jul 21, 2002.

  1. Steve Estabrooks

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    I finally got around to testing my Tempest Adire Alignment Sub. The corrected data is below. It seems like I have a dramatic drop off around 56 Hz. I am running a PE250 watt amp. Any suggestions as to what could cause such a drop off? I think it could be my room as I have a large room with very high ceiling and is open on 2 sides. Any suggestions would be appreciated. I think this sub sounds awesome but could sound better without this drop-off.
    FREQSPL (comp)
    1667.5
    1882.0
    2095.5
    2289.5
    2593.0
    2892.0
    31.590.0
    3690.5
    4088.5
    4587.0
    5090.5
    5672.5
    6386.5
    7179.5
    8077.5
    8986.5
    10079.0
    11174.0
    12566.5
    142.562.5
    16054.5


    Thanks

    Steve
     
  2. Pete Mazz

    Pete Mazz Supporting Actor

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    Other than measuring the sub in different locations in your room, a BFD (parametric EQ) would be the solution if you want to correct it. A search on "BFD" would answer all your questions if you decide to go that route.

    Pete
     
  3. Nathan Bower

    Nathan Bower Extra

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    I wouldnt worry about it, but mabe you should work out your room's standing frequencies. Hm not sure thats the right word. Its a very long time since I read the document all about this - I think it concerned placement of subs in a cinema - anyone got the URL??

    basically measure x y and z dimensions of your room. Lets say its 10 m long. Speed of sound is 340 M/s at sea level. A 1hz tone fits 1 wave in at 340, a 2 hz tone fits 2 complete cycles in an so on.

    The fundamental frequency of a 10m length is 34hz (340/10M).

    Now if the two walls that are 10m apart are acoustically reflective then you will get a peak at this frequency. If they are accoustically absorbant then you get a suck out.


    Well thats about as good as my brain will remember right now. Anyone spot mistakes?

    HTH,

    N
     
  4. Scott Simonian

    Scott Simonian Screenwriter

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    I have the exact same problem Steve. Yes, its your room. I just re-oriented the room so my response was at its flattest.
    Good luck. [​IMG] [​IMG]
     
  5. Steve Estabrooks

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    Thanks for the suggestions. Unfortunatly I cannot move the sub because of the room layout. It is really an odd shaped room. Unless I do some MAJOR reconstruction on the house at great expense, I am stuck with it. Maybe I am worried about nothing. I think it sounds awesome. Looking at the jaw drop factor when I have people over to listen to it, nobody hears anything wrong.

    I thought it may be something I could do to the sub to correct it.

    Thanks

    Steve
     

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