DACs
A digital to analogue converter turns stored numbers into a voltage. Every phone, laptop, television and streamer already contains one, so nobody buys their first converter. They buy their second, and the only real question is whether the second one earns the money.
The misunderstanding that sells the most converters is that this is where detail comes from. It is not. What an external converter reliably fixes is a short list of specific faults: a laptop output that picks up the machine working, a source too weak to drive anything, a hiss you can hear between tracks. Those are real and they are fixable. Sounding better in general is a much weaker claim, and it gets weaker the further up the price list you go.
Which one
Work out which problem you actually have, because two very different ones get confused constantly. If you can hear your computer working, a faint whine that changes pitch when you scroll, that is electrical noise picked up inside the machine and almost any external converter removes it. If your music is clean but quiet and lifeless, the converter is not your problem and an amplifier is.
Next, decide how it connects. USB is the common case, and it carries power as well as data, which is how noise gets in on weaker implementations. Optical breaks that electrical connection entirely and is the one to reach for when noise is the problem you are solving. Coaxial sits between them. A converter with several inputs is often worth more than one with better numbers and only USB, because it means a television, a turntable and a laptop can share a desk.
Which one
Work out which problem you actually have, because two very different ones get confused constantly. If you can hear your computer working, a faint whine that changes pitch when you scroll, that is electrical noise picked up inside the machine and almost any external converter removes it. If your music is clean but quiet and lifeless, the converter is not your problem and an amplifier is.
Next, decide how it connects. USB is the common case, and it carries power as well as data, which is how noise gets in on weaker implementations. Optical breaks that electrical connection entirely and is the one to reach for when noise is the problem you are solving. Coaxial sits between them. A converter with several inputs is often worth more than one with better numbers and only USB, because it means a television, a turntable and a laptop can share a desk.
Extras and formats
Then decide whether you want it to do anything else. Many converters include a headphone amplifier, a volume control, or both. If this box is going to be the whole system, that is a saving. If you already own an amplifier you are happy with, a converter with a line output and nothing else is the cleaner buy and usually the cheaper one.
Formats are the last thing to worry about and the first thing printed on the box. Support for very high sample rates and one-bit formats is close to universal now, and it is not a reason to choose between two units. Check that it handles what you actually play, then stop reading that part of the specification.
Extras and formats
Then decide whether you want it to do anything else. Many converters include a headphone amplifier, a volume control, or both. If this box is going to be the whole system, that is a saving. If you already own an amplifier you are happy with, a converter with a line output and nothing else is the cleaner buy and usually the cheaper one.
Formats are the last thing to worry about and the first thing printed on the box. Support for very high sample rates and one-bit formats is close to universal now, and it is not a reason to choose between two units. Check that it handles what you actually play, then stop reading that part of the specification.
Worth reading
All guides
Your laptop already has one. The question is whether a better one changes anything you would still notice a week later, and where it stops mattering.
You already own a DAC. Here is what a better one actually changes, when it matters, and why the headphone and the amplifier come first.
Most people do not need an external DAC. The three situations where one earns its place, what to buy in each, and the gap in the middle.
Impedance and sensitivity tell you whether a headphone needs an amplifier, and for most of the headphones on this site the answer is no: here is how to read the two numbers, and which ones actually...
Worth knowing
This is the category where money stops buying improvement earliest. Past a competent modern unit, what the extra hundreds buy you is inputs, build, a volume control, a display, a remote and a warranty, rather than a different sound. Those are legitimate things to want.
The filter settings on the front panel do very little. Most converters offer a choice of digital reconstruction filters with names like fast, slow and minimum phase. The differences are real and they are tiny, mostly confined to the top octave, and they are nothing like the difference a pad change makes on a headphone. Try them, enjoy them, do not choose a converter on them.
Jitter is largely a solved problem that is still sold as though it were not. Asynchronous USB, now the default, means the converter runs on its own clock instead of following the computer's. External clocks and reclockers are aimed at a fault that modern designs do not have.
Two practical things that do matter. Ground loops are common once a converter, an amplifier and a computer share a desk, and the symptom is a hum that arrives when the last cable goes in. That is a wiring problem, not a component problem, and a better box does not fix it. And a converter with a fixed output feeding an amplifier with no volume control is a way to get very loud very fast, so check that something in the chain controls level before the headphones go on your head.
Worth knowing
This is the category where money stops buying improvement earliest. Past a competent modern unit, what the extra hundreds buy you is inputs, build, a volume control, a display, a remote and a warranty, rather than a different sound. Those are legitimate things to want.
The filter settings on the front panel do very little. Most converters offer a choice of digital reconstruction filters with names like fast, slow and minimum phase. The differences are real and they are tiny, mostly confined to the top octave, and they are nothing like the difference a pad change makes on a headphone. Try them, enjoy them, do not choose a converter on them.
Jitter is largely a solved problem that is still sold as though it were not. Asynchronous USB, now the default, means the converter runs on its own clock instead of following the computer's. External clocks and reclockers are aimed at a fault that modern designs do not have.
Two practical things that do matter. Ground loops are common once a converter, an amplifier and a computer share a desk, and the symptom is a hum that arrives when the last cable goes in. That is a wiring problem, not a component problem, and a better box does not fix it. And a converter with a fixed output feeding an amplifier with no volume control is a way to get very loud very fast, so check that something in the chain controls level before the headphones go on your head.
We take DACs on consignment and in trade. Tell us what you have.
Where to go next
The brands we carry
What you get either way
The listening room
Third floor at 215 East Lewis Street in Livingston, by appointment. An hour in the room settles this faster than anything either of us could write.
How we grade
Used and consigned gear is graded at the worst axis and never averaged. Every defect is named on the listing and the standard is published, so as described is something you can hold us to.