My name is FJ Lamela and I have been a composer and producer since 1989. I'm very impressed with the Reference speaker calibration software. I have a medium size recording studio, acoustically treated. But always i feel some reflexions and some cancelations in sound. I Have tried to move,change orientation of speakers, keyboards,angles,etc,but the problem persist. Years ago,I bought a software for room eq(you know..),the software is ok,but the results were very disappointing. Although many sound problems ended, the resulting sound is like plastic,phasey,lifeless. I had many doubts before trying the Reference software, since many acoustic problems in a recording room may even worsen with eq. After testing Reference 3 software I have been positively impressed. 90% of the problems have been improved or completed. The sound is very natural, defined.I can not hear resonances or reflected sound. All is neutral and balanced in a positive way. It is a great product that does what it provides a better result than expected. And finally i need to say: 1.-The team of Sonarworks is so profesional and support is excelent. 2.-The help received through the mail has been great. I hope to continue to improve and make us interesting offers for the HD option.