HDQTRZ (pronounced Headquarters) Digital Mastering Studios has been the secret weapon behind record labels for years, creating the best sounding mastered tracks in the music industry. Send us your music and listen for yourself.

Earle Holder is considered among the top Professional Mastering Engineers worldwide. He is passionate about insuring your music sounds the absolute best.  We specialize in all styles of music including classical, rock, hip hop, jazz, trance, techno, etc.

Hdqtrz Digital Mastering Studio is committed to providing their clients with the best sounding finished product ever.  Get a free download of any music contract  you need by clicking  on our "Tips" link.

Tasteful compression on individual instruments is fine but don’t normalize, compress, limit or eq your stereo mix at the output before you give it to me. The mixes should not peak over OdBFS and if they “look” soft on your editor after the mix-down - DON'T TURN IT UP

You can send (and receive) your project from anywhere in the world over the internet to Hdqtrz Digital Mastering Studios (we have a high speed line with lots of bandwidth allowing us to download your large .wav or .AIFF mix files.
 
Our clients benefit from the expertise of seasoned, industry professionals with more than forty years of industry experience.

HDQTRZ Digital Mastering Studios is owned and operated by Earle Holder, Professional Mastering Engineer, and Professor Griff, Producer and current member of Public Enemy for over twenty years.