What is jitter, and does it matter?

Jitter is one of those hi-fi terms that sounds more intimidating than it really is. In digital audio, it refers to tiny timing errors that occur when converting digital data (those ones and zeros) into an analog signal we can actually hear. Think of it as microscopic “wobble” in the timing of the digital clock - and while it’s measured in billionths of a second, in a revealing system, it can subtly affect how music feels.

1. Understanding Jitter

Digital music isn’t continuous like analog - it’s a stream of samples that must be converted back into smooth analog sound. To do that, your DAC (Digital-to-Analog Converter) uses an ultra-precise clock to determine exactly when each sample should be played.

If those timing intervals drift, even slightly, the samples don’t line up perfectly. That’s jitter. It’s not an error in the data itself - the ones and zeros still arrive intact - but rather in the timing of their playback.

Imagine a drummer who’s technically playing all the right notes, but whose timing fluctuates just enough to throw off the groove - that’s jitter in musical form.

2. Where Jitter Comes From

Jitter can creep in at various stages of digital playback:

• Source components: Poorly designed streamers, CD transports, or USB interfaces may have unstable clocks.
• Cables: Long or poorly shielded digital cables can add electrical noise that interferes with timing precision.
• DACs: The internal design and clock quality of your DAC determine how effectively it rejects incoming jitter.

Modern DACs typically include advanced re-clocking systems that reduce jitter, but older or cheaper designs may not handle it as gracefully.