Will the audio sound better if I connect my Blu-ray with digital optical audio cable to home theater receiver?

My Blu-ray player is already connected to my receiver via HDMI. Will it sound better if I connect a digital optical audio cable from the Blu-ray player to the receiver or would I just be wasting money buying it since it's already connected by HDMI?

Careful here - you should get identical sound with HDMI and optical using Dolby Digital.

However - Dolby Digital is compressed. BluRay disks sometimes have un-compressed tracks called "DTS-Master" and ... another term I cannot remember. These tracks are only available using an HDMI cable.

There are some "emperors new clothes" issues with this:

* Most people do not have highly sensitive music caliber speakers so they can hear the difference between compressed and un-compressed audio tracks

* Hollywood hates to spend money so only a few premier disks have extra attention spent on the un-compressed soundtracks.