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Old 05-09-2016, 05:44 PM
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Default Linear X mic

anyone familiar with linear x microphones from back in the day? 99% sure this is the RTA mic the guy i bought it from was using, he had a bunch of other stuff too.. rta jr or something along those lines (obviously only works on computers from the 90s lol)

mainly just want to know if it will measure flat accurately.. ive been told these are very high quality but its from shortly after i was born so information is scarce to say the least

looks a whole lot like this: http://www.linearx.com/products/micr.../m31/M31_1.htm

but i believe an earlier model

also yup just found what i ended up with, minus the computer driver board:
http://www.linearx.com/products/anal...jr/RTAjr_1.htm

Last edited by mitchell0715; 05-09-2016 at 05:47 PM.
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Old 05-11-2016, 04:39 PM
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bump for oldschool guys to chime in
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Old 05-11-2016, 07:09 PM
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That can be used as a measurement mic. Two things to point out though: (1) ideally you would have a calibration file to use to compensate for the natural frequency response of the mic capsule. If you don't have that, you can use a generic calibration file for the panisonic wm-61 mic capsule, which is almost definitely what that uses. (2) Over time the mic capsule's response will wander a bit due to use. That's OK though, because even a non-calibrated mic is usually only off a couple dB, typically with a rising response starting around 5khz and going up to a maximum of 3-4dB around 10khz. SO even a non-calibrated mic will be acceptable flat, just remember that measurements made using the mic will look a little lower in the treble than the actual response. Some capsules display a falling response below about 50hz, so if the measurement looks wonky in that area you probably shouldn't trust it. Between about 50hz and about 5khz (where tuning is most important) the capsules are naturally flat.
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Old 05-11-2016, 07:25 PM
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Quote:
Originally Posted by SPLEclipse View Post
That can be used as a measurement mic. Two things to point out though: (1) ideally you would have a calibration file to use to compensate for the natural frequency response of the mic capsule. If you don't have that, you can use a generic calibration file for the panisonic wm-61 mic capsule, which is almost definitely what that uses. (2) Over time the mic capsule's response will wander a bit due to use. That's OK though, because even a non-calibrated mic is usually only off a couple dB, typically with a rising response starting around 5khz and going up to a maximum of 3-4dB around 10khz. SO even a non-calibrated mic will be acceptable flat, just remember that measurements made using the mic will look a little lower in the treble than the actual response. Some capsules display a falling response below about 50hz, so if the measurement looks wonky in that area you probably shouldn't trust it. Between about 50hz and about 5khz (where tuning is most important) the capsules are naturally flat.
interesting, so ill need to calibrate it with my laptop using the software for the wm-61 before i start using id assume? I've heard that real calibration is often more expensive than the cost of the mic so im going to just go with the best i can get with small ripple. im not going to bother with it for the sub unless i notice huge problems because i wont be able to eq it anyway i have my dsp 8 channels just for my doors

thanks!
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Old 05-13-2016, 03:51 PM
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does this look appropriate as a calibration file?

http://www.holmacoustics.com/downloa.../Mic_WM61A.cal

how exactly do i use it for my mic, and what are the possibilities of this actually skewing my results more than id like?
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Old 05-13-2016, 04:55 PM
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as far as i remember the linear X where always stiffer than the audio control and b&k. tuned in for some real facts..
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Old 05-13-2016, 05:20 PM
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i was able to get the wm-61a file deliminated properly and into REW, but im still unsure how close the wm-61a is to my linearX M-31... any insight? what all is similar? they look nothing alike so idk lol
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