How to re-program/modify sound frequencies without DSP processor?

1. Do you need a DSP?
2. How is DSP programmed?
3. Do I need a DAC and DSP?
4. What is the difference between DSP and DAC?

Do you need a DSP?

A DSP can improve your overall sound quality. A DSP can help you get more bass out of your system. A DSP can make your system louder without distortion. A DSP can protect your speakers from damage caused by over-amplification.

How is DSP programmed?

Digital Signal Processors (DSP) take real-world signals like voice, audio, video, temperature, pressure, or position that have been digitized and then mathematically manipulate them. A DSP is designed for performing mathematical functions like "add", "subtract", "multiply" and "divide" very quickly.

Do I need a DAC and DSP?

The direct answer would be: yes, you should go for DACs with built-in DSP. Having DSP inside your DAC can potentially bring a lot of improvements in your audio quality regardless of what you're listening to.

What is the difference between DSP and DAC?

A DSP does some kind of processing to a digital signal, since it is a digital signal processor. If it is purely a DSP, it shouldn't be converting anything to analog, though devices like the MiniDSP HD do both. A DAC converts a digital signal to an analog signal, since it is digital to analog converter.