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"no laptops used may be plugged into ac power" how to get round this

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  • #31
    You can get a 12V adapter for your laptop and just bring a couple 100 lb deep discharge batteries with you .

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    • #32






      Quote Originally Posted by RoadRanger
      View Post

      Do tell ?




      Point to point with wireless is easy.



      Don't use analog wireless! It has limited frequency response (by FCC rules) and little dynamic range so you're gonna get the quality of a cassette with Dolby noise reduction. In fact the compander circuits are very much like that. The other thing with frequency response on analogs is it changes with level



      OTOH ... our digital units (even the cheapest one) has flat 10 Hz to 20 kHz frequency response and a full 115 dBa dynamic range with no gimmicks. Most analog doesn't have much low end below 50 Hz and they don't pass transients very well at all.
      Don Boomer

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      • #33
        I like this solution. In fact. A quality iem system might be the least of the evils. With good units, the performance is not as bad as don suggested, though this is an application where digital wireless really does shine.









        Quote Originally Posted by flanc
        View Post

        The only way I can see to do strictly under his conditions is to use extended life or multiple laptop batteries...and yes, this is ridiculous rule. Would he take an output from an "old school" cd based system?



        I'm not recommending this, but an "outside the box" idea would be to connect your laptop wirelessly to his mixer through an IEM system or something similar. Take the headphone out of the IEM receiver into a stereo pair on his mixer and output your line level audio into the sender unit. Now, admittedly, this introduces more issues than the laptop power supply...but if the guy is just being hard headed...it might be an ugly work around.



        In that line of thought...I'm guessing there is not optical out (Toslink) on your system and an input on his...a fiber connection wouldn't cause any AC problems.




        -------------------------------------------------------------------------------------------------------------------------------------------------------------------
        Former product development engineer: Genz Benz, a KMC Music/Fender Musical Instruments Company, continuing factory level product support and service for Genz Benz

        Currently product development engineer: Mesa Boogie

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        • #34






          Quote Originally Posted by agedhorse
          View Post

          With good units, the performance is not as bad as don suggested,




          The analog units I measured here are from manufacturers that start with "S" and cost just a bit less than $1000 each. The digital example is a XD-V30.



          If you're alright with this then I am .



          Don Boomer

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          • #35
            i am going to try and push the di solution first because i know i would be the one buying the digital wireless unit, and i'd need two because the person who made up the dj schedule set it up so that each dj only has 45 minutes, so we'll be switching them out rather a lot. it was not a smart move on my part to decide to be helpful, but i was going to be there anyways whooping it up for the weekend and the person in charge of the musical events and shows was struggling badly, and i felt bad for him as a young kid new to getting ****ed on by people who think they are gods gift to fan convensions..so i offered help.



            my role is manage the djs, keep them on schedule, and work with av to get what we need provided. some of the djs, myself included, use cdjs and a mixer, but most of the "tallent" used loosely, is laptop based and has never even touched a real turntable, let alone a cdj.



            i'll get through it, and whomever said "if half the tallent walks away, maybe they will learn something?" god i wish you were right..

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            • #36
              I've been using one of these:

              http://www.zzounds.com/item--ARTDTI

              and a common 1/8" trs to dual RCA cable or one of these:

              http://www.musiciansfriend.com/acces...33053000000095

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              • #37






                Quote Originally Posted by dboomer
                View Post

                The analog units I measured here are from manufacturers that start with "S" and cost just a bit less than $1000 each. The digital example is a XD-V30.



                If you're alright with this then I am .







                I am more familiar with the brand that begins with A, but the curve is similar, and with very small amounts of corrective eq (at a penalty of a couple dB of increased noise), you can get well within the acceptable specs given the (typical) playback transducer's response... especially considered the DJ genre's acceptability.



                The companding has gotten much better in practice with IEMs, and while it may be a problem under some conditions, I think it would be acceptable under most. I agree that this is one area where digital wireless has a pretty clear advantage (broadband program), but better may not translate to better for many users.
                -------------------------------------------------------------------------------------------------------------------------------------------------------------------
                Former product development engineer: Genz Benz, a KMC Music/Fender Musical Instruments Company, continuing factory level product support and service for Genz Benz

                Currently product development engineer: Mesa Boogie

                Comment


                • #38
                  Personally I wouldn't deal with such people. Life is just so much easier without something like that. There's always a know-it-all or two at these things. Better just to pay your $5, sit in the crowd and enjoy the ****************show.
                  NO SIGNATURE FOR YOU!!

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                  • #39
                    USB to audio interface. It takes whatever grounding scheme that the laptop uses, if it even has a grounded power supply, out of the loop. You will have to change the output device preference on your laptop to USB, but I have found this to work with Apple laptops rather well.

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                    • #40
                      ^ Don't think I've ever seen a USB audio out that was isolated from the laptop's ground

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                      • #41






                        Quote Originally Posted by RoadRanger
                        View Post

                        ^ Don't think I've ever seen a USB audio out that was isolated from the laptop's ground




                        Well, you may want to look. Not all "Line Lump" power supplies have a grounded input. When there is no EGC on the input to the laptop power supply, the "Ground" that is applied to the sleeve of the line out on the laptop must be derived somehow. I don't believe there is a standard method to achieve this derived ground. While it is true that the USB cable has a shield conductor, not all interfaces will pass that connection to the audio outputs. It may be that the outputs of the DACs in the interface have no connection to the USB input at all. This method may provide a better frequency response than the audio circuitry on the laptop. It is also likely that this solution is less expensive than a wireless scheme. I am not saying that the other methods mentioned won't work. I am saying that the USB scheme has worked for me, on three different hardware platforms. I would respectfully suggest that you try this method before you condemn it.

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                        • #42
                          that art unit looks a lot like the unit i had a friend make me awhile back though mine does not have xlr inputs, but does have a 1/8 stereo inputs. i'll pick up one of those if only to have on hand. i'm not going to spend money to make there show work just because someone is being stubborn, so while i'd love to just do the wireless thing, its not within the scope of budget or will for this shows success.

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                          • #43






                            Quote Originally Posted by Keyrick
                            View Post

                            I would respectfully suggest that you try this method before you condemn it.




                            Any particular USB I/F you've had good luck with? As I said I've not seen one that doesn't have its output grounded through the USB port. Kinda hard to "try" if one doesn't know what particular one to try, no?

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                            • #44






                              Quote Originally Posted by Keyrick
                              View Post

                              USB to audio interface. It takes whatever grounding scheme that the laptop uses, if it even has a grounded power supply, out of the loop. You will have to change the output device preference on your laptop to USB, but I have found this to work with Apple laptops rather well.




                              Same experience, once used a USB interface buzz went bye bye. This was with a PC however not a Mac.

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                              • #45






                                Quote Originally Posted by RoadRanger
                                View Post

                                Any particular USB I/F you've had good luck with? As I said I've not seen one that doesn't have its output grounded through the USB port. Kinda hard to "try" if one doesn't know what particular one to try, no?




                                I have used the M-Audio and the PreSonus units. Have a look at the link.



                                http://www.musiciansfriend.com/audio...catId=site1YBK

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