[bwanaaa]

Digital or analog domain? In the good old days when all music was analog, you had bass and treble knobs. OR you had a separate box that was an 'equalizer' with a bunch of sliders for the different frequency bands.
 
But now most music is stored in a digital format. Does it make sense for any device to do anything besides amplification after the digital to analog conversion?
 
 
For example, some iPhone players (elephant candy, can opener, TEAC hifi, Onkyo hifi, etc) have parametric equalizers where you can boost certain frequencies. I guess this modification happens in the digital domain. 

 

[MindsMirror]

It is much cheaper and easier to do EQ in the digital domain. Analog EQ circuitry takes up space on your circuit board. Space is a valuable and limited resource in modern devices. Not to mention the knobs and sliders, no one wants 10 knobs sticking out of their iPhone just so they can have a 10 band EQ, when you could do the same thing in software with no knobs. Analog EQs are also very inflexible. With one cheap microprocessor you can do practically any EQ or DSP that you want.
 
Analog EQs are used in instrument and pro sound equipment. Sound guys love knobs and sliders, and it doesn't really matter how big your mixing board is, you don't have to carry it around in your pocket.