The company also offers a list of 24 sets by different makers bundled with the software and a specific calibration file. Sonarworks says these average calibration curves should be accurate to within +/- 3dB, but also offers a service for an additional €99 where you send your headphones off and it does specific measurements for both the left and right channels, which will increase this to +/- 0.9dB. These digital profile curves, created using a patent-pending acoustic-measurement system called PAPFR (aka Perceived Acoustic Power Frequency Response), can be chosen from a drop-down list and then used with a transparent filter to give you a totally flat frequency response. Sonarworks has measured 32 sets of the most popular studio headphones, including those by AKG, Audio-Technica, Beyerdynamic, KRK, Sennheiser, Shure, Sony and more, plus a recent update adding more exotic cans from Audeze and other manufacturers. Reference 3 is also available in room-calibration flavour, but here we’re going to be looking at the headphone-calibration plug-in, in VST, AU, AAX and RTAS formats. Often even the most expensive sets have bumps and dips at certain frequencies – enter Reference 3 by Sonarworks.
There are endless debates on whether mixing using headphones is a viable practice, and one of the main issues is that no set has a completely flat frequency response across the spectrum.
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