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System help for a wedding reception

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  • System help for a wedding reception


  • #2
    Re: System help for a wedding reception

    You need a pair of PA speakers on stands and one decent sub for this event so you have more amps than you need really but I'm not clear on what speakers or parts of speakers you have on hand, can you clarify.
    Paul O

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    • #3
      Re: System help for a wedding reception

      The speakers that I am proposing to put together have a Eminence Deltalite 2512 ll and a B&C DE250 on a QSC PL-000446GP Waveguide Horn. These will go into an ported peavey cab of about 1.8 cu. ft. I have a passive crossover design for this combo but it may need some higher wattage resistors. I could go active two way with a sub using the BSS but don't really have the time to do all the measurements to make it all work together. If anyone can help cut that learning curve I would like to try. `The subs are two JBL 4647A which is a 5 cu. ft. box ported to 40 Hz containing a 15 in. 2226h. They are used for general purpose LF in theaters and fixed installs

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      • #4
        Re: System help for a wedding reception

        Originally posted by uroford1 View Post
        The speakers that I am proposing to put together have a Eminence Deltalite 2512 ll and a B&C DE250 on a QSC PL-000446GP Waveguide Horn. These will go into an ported peavey cab of about 1.8 cu. ft. I have a passive crossover design for this combo but it may need some higher wattage resistors. I could go active two way with a sub using the BSS but don't really have the time to do all the measurements to make it all work together. If anyone can help cut that learning curve I would like to try. `The subs are two JBL 4647A which is a 5 cu. ft. box ported to 40 Hz containing a 15 in. 2226h. They are used for general purpose LF in theaters and fixed installs

        OK that clarifies it greatly. Having built a 12" 2-way similar to yours with a passive crossover I'd definitely suggest you go all active to start out, some quick and dirty settings for the DSP are 100hz and 1.5khz LR24 crossovers, a 35hz 24dB Butterworth low cut for the subs, and set the output level of the highs at minus 8-9dB. Give this a listen with a range of music and tweak EQ and relative levels to taste. This will be safe for any power level you want to push the system to, maybe use the P2500 on the comps, the P3500 on the 12's and the P5000 on the subs.

        Save the passive crossover for a later date, I built one for my speakers but it took several revisions over the course of a year or more to get it to a point where I was happy with it.. it's just so much easier and quicker to do it actively if you have the amps and DSP on hand.
        Paul O

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        • #5
          Re: System help for a wedding reception

          Thanks Paul that's exactly the kind of quick and dirty I was looking for. Do I need to do anything with delay as the tops will be on sticks and the subs on the floor but not directly underneath, as there's no pole mount on the sub box. I do have REW and a umm6 mic but haven't used it yet.

          Thanks,

          -Steve

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          • #6
            Re: System help for a wedding reception

            Originally posted by uroford1 View Post
            ... Do I need to do anything with delay as the tops will be on sticks and the subs on the floor but not directly underneath,...
            Steve:
            What would be the distance of separation from the tops?
            From experience: With a distance a little as 8 - 9' ( a half wavelength of 86Hz to 76Hz ) - it made a difference.
            "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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            • #7
              Re: System help for a wedding reception

              I'd say the center of mid woof to center of sub 6-7 feet and maybe another foot further to the center of the horn.

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              • #8
                Re: System help for a wedding reception

                What is your sub x-over frequency?
                Perhaps not a deal breaker, but certainly in your scenario I'd experiment.

                ( 6' -7' is half-wavelength for 114Hz & 98Hz )
                "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."

                Comment


                • #9
                  Re: System help for a wedding reception

                  Paul said set it at 100 but I know that 2226H will play well even higher.

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                  • #10
                    Re: System help for a wedding reception

                    FWIW: I'd experiment with phase/delay.
                    Don't know if you have been in this hall before ( to get a "feel" for it's acoustics ).
                    Certainly any opportunity to test before the wedding would help.
                    Most active crossovers allow for a simple polarity inversion of bands - easy to evaluate by switching in and out. This has helped on occasion.
                    Some active crossovers allow for a delay/phase control in time or degrees.
                    "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."

                    Comment


                    • #11
                      Re: System help for a wedding reception

                      That's what I've read, invert polarity and adjust delay for the deepest measured null at the crossover frequency and then switch polarity back. It's just what distance to measure at and what db or watt output to use in the measurements, things that are a given to pro guy's I have been trying to distill from posts on different forums. I know people are helpful here so I'm trying to get the answers in one place. After set up I may have a half hour to tweak in room.
                      -Steve

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                      • #12
                        Re: System help for a wedding reception

                        http://www.mixonline.com/news/live-g...g-phase/368380
                        "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."

                        Comment


                        • #13
                          Re: System help for a wedding reception

                          I'd worry less about the sound and more about this "iTunes playlist."

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                          • #14
                            Re: System help for a wedding reception

                            Very good tutorial especially Part 2. Just a question, can you apply delay for every phase shift even if it occurs in a small frequency band or do you sum all the delays for shifts that occur in the band between crossover frequencies? Or did I miss the gist of those tutorials entirely?

                            Thanks,

                            -Steve

                            Comment


                            • #15
                              Re: System help for a wedding reception

                              Yeah, that's their deal (bride and groom). I just worry about any variance in amplitude of the songs coming out. I know in Pandora things are up and down depending on the mix, I've haven't used iTunes much.

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