When my EQ is made (analog, not really a digital DSP guy myself) I just look at my measurements and those of others and look for common factors. What I found was that 'exact' correction on a specific test rig is not the way to go and one can be many dB's off on another test rig or actual ears. In the end the result also depends on the target curve one aims for which as is also known does not work for everyone equally well and is listening volume (habit) depending as well.
Large dips, peaks and roll-off is compensated for after all. Sure, there are problem areas that are improved of course. It's a bit like applying room correction measured at the couch and then listen at the listening chair (other position). What I found is that while you can get great measurement results compensating exactly what is measured on a specific rig and get a nice flat line on that particular setup with the exact same headphone on rig position it will be off when measured on any other rig as well as on any other head. The DAW plug-in is available for both Mac OS X and Windows.I have been EQ-ing headphones long before the digital variants existed. Windows PC users can use version 2.2, which will be upgraded free of charge to 3.0 in Spring 2015. A download only license is 229 EUR/$299 USD. The Reference 3 measurement software is currently available for Mac for 269 EUR/$345 USD, bundled version with a custom calibrated measurement microphone. The processing plugin has a filter engine that is specifically designed for audio calibration in a studio setting with a choice of linear, mixed, and minimum phase filters to suit the task at hand. During the measurement process, the software automatically detects the microphone position in the room, making the process much easier and the results more consistent.
Reference 3 utilizes a proprietary Perceived Acoustic Power Frequency Response (PAPFR) technology that measures and analyzes sound the way humans actually hear it. Reference 3 is packed with unique and patent-pending technologies as well as automation that enables anyone to do the complete studio calibration process with a visual step-by-step workflow in less than 15 minutes. Currently the most accurate speaker and room calibration software on the market, Sonarworks Reference 3 empowers studio pros of every caliber to achieve reference sound at an affordable price point. After 3 years and 1M USD spent on development, Sonarworks has just released their newest speaker calibration software for sound studio professionals and home recording enthusiasts.
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