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Author Topic: GOLDLINE DSP30 MIC V.V.Tushit Vijay Film Handler Posts: 54 From: Tenali, Andhra Pradesh, India Registered: Oct 2009 posted 09-14-2010 03:00 PM                     Hi friends. I am Using Gold line DSP30 Real time analyzer With MK8C. But i had a problem with my mic. I am replace it with BEHRINGER ECM8000 i heard that it is also an omnidirectional mic. Can i Use it Will it measure the frequency in correct way.  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 09-14-2010 04:02 PM                     No you cannot, it will NOT be accurate. ANY mic used with an RTA MUST be calibrated to that specific RTA so that it will give the proper readings.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 09-14-2010 05:57 PM                     actually that is not completely true the mic input of a RTA is flat response and a calibrated mic will normally have a flat response usually measured against a BK reference When the choice is made to use non calibrated microphones such as countryman then offset files are used to correct for them  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 09-14-2010 06:04 PM                     Thank you Gordon. But would it not be true that a given "flat" mic's impedance must be matched to the input impedance (or input's impedance range) to ensure flat response? Otherwise I would think that RTA manufacturers would simply give a range of model #s for all mics that will work with a given RTA. In any event I do know that when I sent my RTA to be calibrated I had to send the mic too.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 09-14-2010 08:33 PM                     it is best to send the mic the standard for years was a capsule by AKG and one by B&K as was listed in Dolbys older manuals Also electret condensor mics typically have very similar impedences  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 09-15-2010 09:00 AM                       The AKG was the standard only becuase Dolby picked it as an "affordable" mic. with good and known characteristics. It's best to send the mic. back with the RTA so it can be checked for accuracy of response and so the SPL display can be set to be accurate.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 09-15-2010 07:42 PM                     AKG would also send a printout of the response of your mic too. I know with the R2 and D2 we send out mics back annually for calibration. Then again, we also send our light/color meters back for calibration too (not to THX )  |  IP: Logged

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