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In Reply to: RE: IIIa Frankenpan Active X-Over points? posted by Roger Gustavsson on February 28, 2015 at 05:09:22
I have read that it is difficult to get this mic calibrated, and that it is best done by a company that specializes in calibration, is that true, or could one just use REW to do the calibration?
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Not sure if Cross Spectrum will do a calibration but they do sell calibrated microphones.http://cross-spectrum.com/measurement/calibrated_umik.html
http://cross-spectrum.com/measurement/calibrated_umm6.htmlminiDSP directly from the manufactor:
http://www.minidsp.com/products/acoustic-measurement/umik-1I like the ones connecting through USB, no need for an additional preamp.
Measuring techniques need to be studied too! A microphone need to be understood, it is not as sofisticated as our ears (+brain).
Edits: 03/02/15
I ordered a MiniDSP. I think that the USB connection is definitely a plus, and it is calibrated. Not bad for under $100. I just hope it performs as well as the reviews say. Do you have any experience with this mic? I could use it on my iPad as well. Shouldn't the Behringer be able to be used for the Auto-Align" feature in the DCX? Or does it also have to be calibrated for this use as well?
No, I have no experience of the miniDSP UMIK. Auto-align is often a bad idea. Can you chose a target curve? If not, it is really a bad idea. A straight line (a linear response) is not what is wanted, more a tilted curve dropping towards higher frequencies. A microphone cannot separate direct and refected sounds as our ear and brain can.
Roger would you know what the phase of each of the drivers should be in relation to one another?
The phasing of the drivers depends on the order of the filters. For instance, if you change from first to second order, phase need to be changed too. In the end, you need to measure the frequency response of the speaker. The crossover will also influence the dispersion charateristics of the speaker. There will be a main direction of "throw" from the speaker depending of the chosen crossover/phasing. Yes, this is complex....
Can you find the original phasing of the drivers? Think you need to start from there. Maybe some guys can run simulations on some crossovers? A good start is to measure the frequency response of each driver without crossover. A warning, it is easy to damage the ribbon tweeter that way. Maybe a large capacitor in series with it gives some protection?
I would have to do more reading on the auto alignment to see if a target curve can be done with the DCX2496. I do not recall seeing anything referring to this but I will check further. Thanks for the advice.
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