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In terms of mic calibration would this be a case of inputting the frequency response data of the mic into a text file or somthing that REW can read? I would like to be able to take acurate readings up to 20k if possible so it may well be worth getting the spl meter you mentioned for this, plus it sounds like it'd be better for setting levels.
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Yeah, go to the
download page and drop one of the cal files (like the
Galaxy cal file ) into notepad and you'll see the txt format. You can create it with notepad and then save as a .cal file. It's quite free form in the spacing between frequency readings also. REW will simply 'connect the dots'. At the limits of the file REW will continue out with the last value.
I don't know if the Galaxy is accurate out to 20K or not. Perhaps you can use one of your full range mics and run it through the motu preamp and then send the (required) line level signal into the XP PC soundcards line-in (if you can find one with line-in). If your mics aren't full range, then I guess the Galaxy is your next best bet. Sometimes studio mics aren't great measurement mics as they may be oriented toward voice range responses. You would know that though, since you have the graphs of them.
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I have got an xp laptop with in-built sound, but it may be a bit too crappy to use..there's only mic in (not a mic pre-amp) & speaker out on it. I've no problems with grabbing a soundblaster or whatever if needs be though.
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Laptops typically only have mic in and that is indeed not really suitable. Most people who use a laptop for REW use the simple and inexpensive USB soundcards..... that's your best bet.
brucek