Live Sound: Starting with Room Demensions MATH/Software

Discussion in 'Tracking / Mixing / Editing' started by TNT, Mar 5, 2006.

  1. TNT

    TNT Guest

    Did a search and did not find this so here goes......
    Instead of starting with equipment, would like to start with a room and do the math or use software to determine how much wattage to put in it to obtain a certain dB.

    Anyone know where to start to get there?
    Room is approx 100x60x20.
    Standard sheetrock walls.
    Carpeted Floors

  2. moonbaby

    moonbaby Mmmmmm Well-Known Member

    TNT, Welcome to RO:
    You are looking at this as if there is a program out there that will tell you to use so much power in a room of a particular dimension, and yield a certain SPL when you do so. Am I correct in that ?
    Do you have any understanding of speaker sensitivity ratings? Of the effects things like PEOPLE and FURNITURE in the room have on sound?
    There are soooo many variables in your scenario. There are some programs out there, but they are linked to the equipment in some way.
    JBL, for better or worse, might be a good starting point for you . Go to their website and checkout what they have. You might also go to the MIX Bookshelf and check out some of the publications thay have on acoustics and live sound. Yamaha has (had?) a great primer for live sound, and that book has been on the MIX site. And even this website has a place with some publications that you can learn from....Read up on all you can, baby!

    Jim "If There Was a Magic Formula, I'd Be Outta Work!" Mooney
  3. TNT

    TNT Guest

    Live Sound Math

    Thanks, was hoping some of the variables would be negligable. Pulling out the Yamaha Sound Reinforcement Handbook.

  4. moonbaby

    moonbaby Mmmmmm Well-Known Member

    One thing that you will HAVE to learn and apply is the Fletcher-Munson curve. This deals with athe realationship between power (watts, rms) and decibels, and how one changes the other. Good Luck!
  5. sheet

    sheet Well-Known Member

    Not really. Studies are showing that those curves are not the norm any more. Our society is exhibiting signs of serious threshold shifts earlier on. The ear is most linear at about 85dB. But, I don't of any shows that have been that low with success, unless the acoustics are excellent, and the musical genre lends itself to that.

    Go to Crown's (the amp manufacturer) website. They have this calculator. It is simple. All you must know is the distance away from the speaker, the sensitivity of the speaker, and the desired headroom. This is really a moot point without knowing the amplifier's efficiency, speaker cable length, noise floor of the room, etc.
  6. djrr3k

    djrr3k Guest

    If you have some drafting exerience the program Ulyesses (spelling?) could be beneficial.


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