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Author Topic: Using Ivie Analyzer with Mic Multiplexer Matt Zeiner Expert Film Handler Posts: 146 From: Windsor, CT USA Registered: Sep 2003 posted 09-27-2003 01:08 PM                     You are right, Mark. If you cal. each mic from the same position in the room (i.e. each is set to the same level on the RTA from the same spot in the room), then tweak the scan rate to minimize the bobbing, it seems to translate from room to room relatively well, though. I find that I'll hit one or two rooms in a complex that will require an increase or decrease in scan rate, but rarely after I've calibrated the levels do I have to change that. I still find that the SPL readings are not too precise, though, and I don't set them with anything but the IE-2. Can you tell us whether the R-2 actually matches the gains between microphones or just varies the scan rate? If the R-2 adjusts the gains, what does it use as a reference to provide SPL information? I've never used one and I'm curious. I've heard rumors that although THX is going with Creative Labs, there will be a new incarnation of the R-2 coming out. Anyone hear anything?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 09-27-2003 02:33 PM                     Matt, Far as I know it adjusts gains of the mics as you can actually see a level shift on the laptop at the very start of using te GO function routine. I've nver seen a rate change in the plexer part and I believe its about 1 mic per second or there abouts. R-2's should be calibrated once a year by the manufacturer so the SPL readings can be guaranteed. Also, they made a small batch of THX mic calibrators for double checking the calibration in the field before a re-cert is done, but any mic calibrator adapted to the countryman mics could I suppose be used. The new version will supposedly be built at least in part by USL in the near future. Mark @ CLACO  |  IP: Logged Matt Zeiner Expert Film Handler Posts: 146 From: Windsor, CT USA Registered: Sep 2003 posted 09-27-2003 02:49 PM                     1 mic per second would require about a 4 second average time to integrate all four into a given sample. Thats real slow... I usually set the usl to pulse all four mics in about 1-1.5 secs which corresponds to the Ivie's averaging nicely. What would you say is the advantage to using an average that is that slow? Doesn't it take a long time for the RTA to reflect changes? Thanks for the info...  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 09-27-2003 03:59 PM                     Averaging in the current R2 software occurs over 1 min. 30 seconds gathers the average SPL at mic1's position and then th analyzer adjusts the gain of the other 4 mics to that and then does the 30 sec resopnse average The USL works well and aslong as the battery is fresh will have an accurate SPL if one calibrates it's master gain to the analyzer The bounce in most rooms is minimal as well As for"soing it by ear is an unreliable unproffesional foolish move and a fraudulent ripoff of the customers money  |  IP: Logged

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