A digital to analog converter (DAC) converts a digital audio signal into an analog format suitable for input to an amplifier. DACs may be built in to components such as CD players, home theatre receivers or integrated amplifiers, or they me be stand-alone devices.
The quality of the DAC in a digital audio system has a a major impact of the ultimate quality of the sound produced by the system. Among the factors that affect sound quality are:
- The precision and stability of the clocks used to control the timing of the audio signal
- The filters used in the conversion process
- The quality of the DAC’s analog circuitry
- The quality of the DAC’s digital interfaces. This is particularly critical for USB and TOSLINK interfaces.
- The quality of the DAC’s power supply
- The quality of the digital and analog cables used with the DAC
Many stand-alone DACs provide volume controls so that the can be connected directly to a power amplifier, without the need for a preamplifier. High quality, built-in headphone amplifiers are also available in some stand-alone DACs.
©Wayne Butcher