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Welcome to Grace Design Professional Audio
"I work as producer/engineer/mixer for many artists including: Selena Gomez, Josh Groban, Celine Dion, Barbra Streisand, Il Volo, etc...the 904b has added a depth to my critical listening, I can work longer hours w less ear fatigue, I can hear the music much clearer at lower levels and in generally it's something I could not be without!"
"The m903 sounds better than any headphone amp I've ever used. There is something magical in this box."
- Bob Ludwig, Gateway Mastering and DVD
