Why is the sound on Blu-rays and DVDs always so low? Even through good quality headphones I end having to turn the sound nearly all the way up, and it's still low. Are these things really being this cheaply made? And I'm not just talking about cheap discs. It's the same with releases from high-end companies like Synapse, Blue Underground, Criterion and Arrow.

Dolby Digital Vs LPCM sound.