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Inexpensive Measurement mic
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<blockquote data-quote="Kip Conner" data-source="post: 24397" data-attributes="member: 445"><p>Re: Inexpensive Measurement mic</p><p></p><p>There are several out there that will work. I have one earthworks m30 that is over the price range and it was used all the time until Smaart 7 came on the scene. Knowing that I couldn't afford a large selection of M30's I decided to somewhat put it away for the near field analysis of speaker systems. I ended up going to a store near by and they let me open up a few of the RTA420 mics, you might know them as the mic that comes with the DriveRack. I did a mic compare of three RTA420 to see how they compared to the M30 and how they compared to themselves. There was a slight hump in the 10k area that the M30 didn't have, but they were all generally close in their frequency and phase response. It should be noted that the 420 is pin 3 hot so the phase was out- no a big deal as long as you know that it is going into a tuning. You can buy these mics for less than $80 a piece and they are mics that you don't have to worry about getting damaged, lost or stolen like you would a more expensive mic. </p><p></p><p>I also did a test against a Behringer mic and it compared well to the M30 in it's responses. </p><p></p><p>When it comes down to it and you are measuring a speaker system in the field these small inconsistencies are going to be a huge difference if we are talking about a dB or so at some given frequency. You can move the mic around the free field and create that effect based on comb filtering and patterns. It's my belief that once you get into the rear of the room that our coherence is going to be so polluted that we have to really look for the big issues, i.e. things that are greater than your single dB inconsistency. </p><p></p><p>I still carry the M30 in the measurement rig, but it doesn't come out that much since I know how these other mics compare. </p><p></p><p>Check out <a href="http://www.tigeraudioinc.com/sales.html" target="_blank">http://www.tigeraudioinc.com/sales.html</a> for the RTA420 or <a href="http://www.rationalacoustics.com/store/microphones.html" target="_blank">http://www.rationalacoustics.com/store/microphones.html</a> for a few more...</p></blockquote><p></p>
[QUOTE="Kip Conner, post: 24397, member: 445"] Re: Inexpensive Measurement mic There are several out there that will work. I have one earthworks m30 that is over the price range and it was used all the time until Smaart 7 came on the scene. Knowing that I couldn't afford a large selection of M30's I decided to somewhat put it away for the near field analysis of speaker systems. I ended up going to a store near by and they let me open up a few of the RTA420 mics, you might know them as the mic that comes with the DriveRack. I did a mic compare of three RTA420 to see how they compared to the M30 and how they compared to themselves. There was a slight hump in the 10k area that the M30 didn't have, but they were all generally close in their frequency and phase response. It should be noted that the 420 is pin 3 hot so the phase was out- no a big deal as long as you know that it is going into a tuning. You can buy these mics for less than $80 a piece and they are mics that you don't have to worry about getting damaged, lost or stolen like you would a more expensive mic. I also did a test against a Behringer mic and it compared well to the M30 in it's responses. When it comes down to it and you are measuring a speaker system in the field these small inconsistencies are going to be a huge difference if we are talking about a dB or so at some given frequency. You can move the mic around the free field and create that effect based on comb filtering and patterns. It's my belief that once you get into the rear of the room that our coherence is going to be so polluted that we have to really look for the big issues, i.e. things that are greater than your single dB inconsistency. I still carry the M30 in the measurement rig, but it doesn't come out that much since I know how these other mics compare. Check out [url]http://www.tigeraudioinc.com/sales.html[/url] for the RTA420 or [url]http://www.rationalacoustics.com/store/microphones.html[/url] for a few more... [/QUOTE]
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