What's the font for the "DIGITAL SOUND" part of the DTS logo here? Lucida Grande is the closest match I've found, but it's not exact even with the stylized "G" in that font.

Optima  Suggested by kirallyarthanovad 

Hello @Damienthefont, i found your serif font but for the dts is a custom font.
I hope you enjoy , Keep smile and happy

Yeah, that's it! Palatino Sans Pro is actually pretty close too!
Oh, and DTS uses Dolmen. I'm currently making a DTS logo remake right now, and this was the last piece of the puzzle!

Yes, I agree with you