[johnwmclean]

I discovered by accident that the equalizer in itunes still works with direct digital output. How can this be? It’s binary data that has not been through a DAC, I cannot fathom as to why this would be possible.
Any ideas?

 

[lozanoa11]

B/c iTunes does the work not your DAC

 

[krmathis]

Like any other software based EQ it alter a digital audio signal.

 

[Roseval]

DSP stand for Digital Signal Processing
What can it do?
Well, almost everything just like Photoshop can do everything with a picture.
•Volume control
•Tone control (atmospheres)
•Room correction
•Crossover
•Sample rate conversion
•Mixing
•Etc.
You want to play at half volume? Multiply the bits by .5 and there you are.
Almost anything you can do with a box full of analog components can be done by applying a formula on the digital data.
A bit more: DSP
A nice example of the architecture of a modern piece of gear: http://wiki.slimdevices.com/uploads/...dio_Design.pdf

 

[johnwmclean]

Thanks guys for all the great responses, I get it now!