Tom Young wrote on Wed, 17 November 2010 21:08 |
Ivan 'scratched the surface' very well. But here's the deal: you will not be able to effectively use SysTune (or any other "complex" measurement system) by reading any amount of advice you can get here via a thread. Your university/employer should invest in sending you (and your colleagues) to SynAudCon, first of all. This will help plant some of the seeds of the groundwork in comprehending all this stuff. It will also give you access to their Tech Topics (aka: newsletters) which have had at least a few articles (and threads, on their listserv) on measurement, mic positions, etc. This is all available when you become a member. www.synaudcon.com Here at ProSoundWeb you will find (if you search, and also look through Study Hall) at east a few articles on such measurement includng some discussion on where to put the mic(s). You should also pick up Bob McCarthy's book on System Design and Optimization (2nd edition) and plan on slowly working your way through that. Then you shoud take a training course in/by Smaart, SIM or SysTune measurement. Each of these companies/products offers very good, hands-on training that will get you started. They generally do them in different parts of the country several times a year. This may seem daunting but very few folks can get their heads around this stuff without lots of reading, training and hands-on experimentation. But it will be well worth it. |
Steve Richard-Preston wrote on Wed, 17 November 2010 22:14 |
So I guess the process would be something like this? 1. Test in various positions 2. Calculate average 3. Make EQ adjustments 4. Retest in same various positions 5. Calculate average (hopefully not have to repeat the process toom many times) |
Steve Richard-Preston wrote on Thu, 18 November 2010 16:21 |
OK, great. If I take mulitple measurements (we only have one test mic) then I'll be moving the mic around to many different locations and then attempting to re-locate it back to exactly the same locations to take the next round of readings (after adjustments are made). In the case of freq/amp, my question to follow that is how do you guys go about ensuring that the mic finds itself back in exactly the same position for each round of measurements? Obviously make markings of where the mic stand is located. Is using a fixed position mic stand and orientating the mic the same way (Eg not adjusting the mic on the stand at all once it is setup) enough? I'd expect that even a small amount off axis from a previous position will return a different response, and if multiple erors are made re-locating the mic the resulting average could be considerably off if all those errors happen to skew the same way? Am I nit-picking now? How far do you guys take this? Cheers! |
Steve Richard-Preston wrote on Thu, 18 November 2010 21:18 |
sure more mic positions per round is better for the average, but if you want to make a comparison between the first round of meaurements and then the second round of meaurements (after tweaking has bene done), then you wouldn't want any variance between the two readings of the same mic position? (as opposed to simply having more mic positiotns to average) Cheers and thanks again for the info/discussion |
Steve Richard-Preston wrote on Sun, 21 November 2010 19:58 |
Hey Ivan, yeah wasn't going get into temperature etc Keep the aircon running the whole time anyway!! Regarding your question, the point your getting at is ensuring phase between multiple speakers right? Good question, so far I've been focussing more on a flat response. But thanks for the heads up. We've got Nexias going into the theatres, so I'm lucky that I don't have to choose! gotta love DSP. What would you choose, if you had to? We've got EV ZX5's going into the front corners of the room and then 2 x AT ALA arrays as a centre fill on the ceiling about 2 meters from the front wall... just FYI |