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L-pad for Church Speakers

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  • L-pad for Church Speakers

    So I'm designing my church's new PA speakers, and I would like to build a small line array with a passive crossover. I guess my main concern is creating an attenuation circuit for the tweeters without overheating the resistors. Any suggestions for a high-power situation like this?
    Eric L.

  • #2
    Use multiple resistors to get the values you need. By combining resistors you will be increasing your power handling and surface area to dissipate heat.
    craigk

    " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

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    • #3
      Craigs suggestion to parallel multiple resistors is great. Some obvious suggestions I might add, all of which you might already plan to do, are using xsim to model the power dissipation of each component with the amount of input power you have, and mounting your resistors on a flame retardant material and away from the wood and stuffing. Just given a pa application and power Id take the extra measures; hate to see you burn down your church because of some mic feedback! *
      Projects:

      Breezy Monitors: http://techtalk.parts-express.com/fo...reezy-monitors
      transcenD: http://techtalk.parts-express.com/fo...5035-transcend
      Summits: http://techtalk.parts-express.com/sh...75-The-Summits
      References: http://techtalk.parts-express.com/sh...-My-References
      Vintage Style 2-way: http://techtalk.parts-express.com/sh...-vintage-2-way

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      • #4
        Better yet, what about ditching the crossovers and going active?
        Projects:

        Breezy Monitors: http://techtalk.parts-express.com/fo...reezy-monitors
        transcenD: http://techtalk.parts-express.com/fo...5035-transcend
        Summits: http://techtalk.parts-express.com/sh...75-The-Summits
        References: http://techtalk.parts-express.com/sh...-My-References
        Vintage Style 2-way: http://techtalk.parts-express.com/sh...-vintage-2-way

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        • #5
          Originally posted by dynamo View Post
          Better yet, what about ditching the crossovers and going active?
          Yeah, I think I will. My church is moving into a new building and we're on a tight budget, but I think it would be worth going active with this. One more power amp and an active crossover isn't going to break the bank. Thanks.
          Eric L.

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          • #6
            Originally posted by brkitup View Post
            So I'm designing my church's new PA speakers, and I would like to build a small line array with a passive crossover. I guess my main concern is creating an attenuation circuit for the tweeters without overheating the resistors. Any suggestions for a high-power situation like this?
            Why not match sensitivities of the tweeters and whatever else you are using? Then there'll be no need to attenuate.

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            • #7
              Lets see $ 2.00 dollars for resistors vs how much for new tweeters
              craigk

              " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

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              • #8
                Eric, you have a PM.
                Wolf
                "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                *InDIYana event website*

                Photobucket pages:
                http://photobucket.com/Wolf-Speakers_and_more

                My blog/writeups/thoughts here at PE:
                http://techtalk.parts-express.com/blog.php?u=4102

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                • #9
                  Originally posted by dynamo View Post
                  Better yet, what about ditching the crossovers and going active?
                  Second this - Solves a lot of issues.
                  (what no floor plan )
                  "Not a Speaker Designer - Not even on the Internet"
                  “Pride is your greatest enemy, humility is your greatest friend.”
                  "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

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