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Best way to run a 4 channel amp/speaker PA?

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  • Best way to run a 4 channel amp/speaker PA?

    Hey guys,



    I'm helping out a guy at work who is setting up a PA/Sound system for an office.



    He wants to run 4 speakers and be able to use 2-3 mics, and a couple line level stereo music sources. It needs to be fairly simple and easy to use. The best part is he already started ordering parts. Fortunately they're all returnable if necessary.



    He got a Sure combo wireless mic package which is cheap, but should be fine.

    http://www.bhphotovideo.com/c/produc...bo_System.html



    DBX DriveRack Processor (overkill? no preamps)

    http://www.bhphotovideo.com/c/produc..._Complete.html



    Crown XLS1000 Power Amp (stereo, not 4 chan)

    http://www.bhphotovideo.com/c/produc...re_Stereo.html



    (4) Klipsch PA speakers (85W, 6.5" + horn drivers)

    http://www.crutchfield.com/p_714AW65...te.html?tp=188



    The room is 75ft wide and 100ft deep open space with at least a 20ft high open ceiling.



    The problem we face is that (as far as i can tell) the DBX has no mic preamp. It's also probably quite a bit overkill for his application. I'm suggesting he return it and get a simple mixer with built in mic-pres like a Mackie VLZ. This should all how to easily connect all his input devices and easily use the faders to control volume. The only problem is that most only have a single stereo main output. Assuming he wants to be able to fade the speakers front/back, is there an easy way to do this so that controlling the fade or rear volume is clear? Ie, i don't know if he'll know how to work Aux sends or something.. a nice clear fader set for front an a set for back would be nice.



    OR, maybe use some kind of very simple 4 channel sound processor with a basic 4-chan mic preamp? Any suggestions on this front?



    I'll talk to him about the need for fading. If not we can maybe gang up speakers on his two channel amp. Otherwise he'll need a second amp or a 4-chan of course.



    Thanks!

  • #2
    Guy at work huh???

    Comment


    • #3






      Quote Originally Posted by TXBDan
      View Post

      The problem we face




      we?

      How are you on the hook for this... um... situation?

      Comment


      • #4
        Make it much easier. Get a little Yamaha MG124C and 4 powered speakers. Run the mice on 1,2,&3. Then run the stereos into the rest. And if these speakers are going to be spread out mono would be the best way to set it up. Run the front speakers off the main out and the rears off of an aux. Quick, easy, and much cheaper than what he bought so far.

        Comment


        • #5
          OK, I'll take a whack at this.



          1. If I understand correctly, the primary purpose is to allow the boss to make announcements to everybody in the office at once. The secondary purpose is to have pre-recorded "background" music playing when announcements are not being made. How often are announcements likely to be made? Daily, hourly, or once in a blue moon?



          2. How big is the office space involved? One big room, or something else? Open, or cubicles? How many people in the office?



          I suspect that everything purchased already should be returned to the seller, but I'll withhold judgment pending your responses.



          Mark C.
          "Good tools are expensive. Cheap tools are damned expensive."

          Comment


          • #6
            Additional info:

            Speakers: http://www.crutchfield.com/p_714AW65...te.html?tp=188 (6.5" 85W outdoor speakers.. oh boy).



            The room is quite big. Its a converted industrial space above South Station in Boston. One giant room, at least 20ft high unfinished ceilings. I'll get dimensions, but it holds about 60 people in an open workspace type environment. They have three 96" projector screens on the front wall. I'd guess the front wall wall is 3x the width of the three screens so a good 40ft wide and similarly deep.



            They'll be doing presentations, have guest speakers, play movies/TV/video. They have occasional parties and play music. The kitchen has a kegerator if that paints the picture. Its a young start-up company.



            I'm thinking the speakers are too small, what do you guys think? I'm not fully convinced they need four speakers. I guess they'd really only shine when playing low level music to fill the room. Anything focused up front "on stage" will only need front speakers. What kind of speakers and power would you guys recommend?



            I like that Yamaha mixer, it looks perfect and easy to use. A mixer + power amp setup sounds good to me.



            No, i'm not legally liable for the outcome of this operation. The VP in charge of this is a friend of mine and he's in way over his head trying to DIY it. I told him i'd help him out.

            Comment


            • #7
              ...

              Comment


              • #8






                Quote Originally Posted by TXBDan
                View Post

                The VP in charge of this is a friend of mine and he's in way over his head trying to DIY it. I told him i'd help him out.




                Have you considered the possibility that the most effective help that you could offer to your friend is to help him select a qualified AV contractor?
                Security Officers have been trained to not touch the service monkey

                Comment


                • #9






                  Quote Originally Posted by lonotes
                  View Post

                  Have you considered the possibility that the most effective help that you could offer to your friend is to help him select a qualified AV contractor?




                  ^^^^ THIS!
                  <div class="signaturecontainer"><a href="http://www.youtube.com/watch?v=V-c1JDsmREI" target="_blank">http://www.youtube.com/watch?v=V-c1JDsmREI</a><br />
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                  <a href="https://www.facebook.com/pages/Sister-Wives/37203218181" target="_blank">https://www.facebook.com/pages/Sister-Wives/37203218181</a><br />
                  <a href="http://www.sisterwivesband.com" target="_blank">http://www.sisterwivesband.com</a></div>

                  Comment


                  • #10
                    His quote from a contractor was $125k. I think we can do a little better than that.



                    I've run sound and lights for two university theaters, run sound at small venues, and had a small recording studio. I know how this stuff works in general, but i haven't been active in 5-6 years. Shaking off the rust here. What i don't have is experience specing out a system for a room this large. I was hoping you guys would enjoy helping me out here.



                    Update for those still playing: room is 75ft wide and 100ft deep.

                    Comment


                    • #11






                      Quote Originally Posted by TXBDan
                      View Post

                      His quote from a contractor was $125k. I think we can do a little better than that.




                      I call total bull**************** on this.



                      You are talking about a $1k DIY installation or a $125k contractor installed installation. I smell a stinking rat here.

                      Comment


                      • #12






                        Quote Originally Posted by TXBDan
                        View Post





                        OR, maybe use some kind of very simple 4 channel sound processor with a basic 4-chan mic preamp? Any suggestions on this front?




                        That's what you'll need to add to what you've got ... it's called a mixer. You'll need a channel for each mic plus a stereo input for each music source. I'd call that an 8 channel mixer.



                        fficial&client=firefox-a" target="_blank" rel="nofollow">https://www.google.com/search?q=8+ch...ient=firefox-a
                        Don Boomer

                        Comment


                        • #13






                          Quote Originally Posted by agedhorse
                          View Post

                          I call total bull**************** on this.



                          You are talking about a $1k DIY installation or a $125k contractor installed installation. I smell a stinking rat here.




                          That's what he said. Why would i make this up?



                          I remember this forum being a lot more friendly a few years ago.

                          Comment


                          • #14






                            Quote Originally Posted by agedhorse
                            View Post

                            I call total bull**************** on this.



                            You are talking about a $1k DIY installation or a $125k contractor installed installation. I smell a stinking rat here.




                            That's what he said. Why would i make this up?



                            I remember this forum being a lot more friendly a few years ago.

                            Comment


                            • #15






                              Quote Originally Posted by TXBDan
                              View Post

                              His quote from a contractor was $125k. I think we can do a little better than that...




                              I'm not far from Boston and know the building you are talking about. Given your description on what you want to do, I will do it for $60k (to be renegotiated up depending on site visit).
                              <div class="signaturecontainer">Good judgment comes from experience, and a lot of that comes from bad judgment. -Will Rogers<br><br><a href="http://facebook.com/SpitShineRocks" target="_blank">http://facebook.com/SpitShineRocks</a></div>

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