12 Apr What Is a DAC – and Do You Really Need One?

Posted at 12:39h in Facts, Gear & Tech, Facts by Elias Kollböck

▶ 5:04 Reading Time

You listen to music every day. On your phone, laptop, maybe through a Bluetooth speaker. And at some point, someone asks in a forum: “Do you have a DAC?” You Google it, end up in a rabbit hole of technical terms, and close the tab. I was right there. Here’s the explanation I wished I had back then.

DROP

▸ A DAC (Digital-to-Analog Converter) converts digital audio data into analog signals that your headphones can play
▸ Every device that plays music already has a built-in DAC. The question is just how well it sounds
▸ An external DAC is worth it starting from headphones in the €100 range and up
▸ Entry-level: from €9 (Apple USB-C Adapter). Solid desktop devices: from €189
▸ The biggest difference is not more bass or more treble, but more space and control

What a DAC actually does

Music on Spotify, Apple Music, or a CD is stored digitally. Ones and zeros. Your headphones work analogously. They need electrical oscillations that move a membrane, which moves the air, which moves your eardrum. Between these two worlds sits the DAC: Digital-to-Analog Converter. It translates the file into a signal you can hear.

Your smartphone has a DAC. Your laptop has a DAC. Your Bluetooth speaker has a DAC. Every device that plays digital music needs one. Most are tiny, sit somewhere on the circuit board, and were optimized for the lowest production costs possible. Not for sound quality.

That’s not a scandal. For most applications, the built-in DAC is sufficient. But when you start using better headphones, you eventually realize: The bottleneck is no longer the headphones. It’s the source.

When You Start to Hear the Difference

I connected my first external DAC on a Tuesday. By Wednesday, I understood why people spend money on them. The track was identical—same file, same headphones. But suddenly, the instruments were positioned in distinct places in the room. Not louder, not bass-heavy. Just more organized.

This happens because a dedicated DAC uses better converter chips, produces less electrical noise, and amplifies the signal more cleanly. The effect is subtle. No bass boost, no “Wow” moment. More like, “Ah, there’s a guitar in the background I’ve never noticed before.”

9€

Apple USB-C Adapter (Entry-level)

189€

iFi Zen DAC V2 (Desktop)

32bit

Max. Resolution (384 kHz)

The honest answer: If you’re using 20-euro earbuds, you won’t hear a difference. The headphones simply aren’t good enough to reveal the improvement. It starts getting interesting in the 100-euro range. Once you’re past 200 euros, an external DAC becomes almost essential if you want to get the full value from what you’ve paid for.

One more thing I only grasped later: The difference isn’t equally noticeable across all music. A heavily compressed pop track sounds nearly the same through a 9-euro dongle as it does through a 200-euro desktop DAC. But play an orchestral recording, or a track with lots of acoustic guitar. Suddenly, you hear the room where the recording was made—the ceiling above the drums, the distance between microphone and instrument. That’s the moment you finally understand why people invest in high-fidelity audio.

How to Connect a DAC

Connect a USB cable from your computer to the DAC. Plug your headphones into the DAC. Done. Most external DACs are plug-and-play on macOS and Windows. You might occasionally need drivers on Windows, but never on macOS. The DAC automatically takes over audio output—just select it as your audio device in system settings.

If your DAC has RCA outputs, you can also connect it to active speakers. That way, you don’t just get better headphone sound—you also improve your speaker audio. One device, two practical uses.

Three DACs for Three Budgets

The Surprise Guest: Apple USB-C to 3.5mm Adapter (from 9 Euros). Not a joke. Apple’s unassuming dongle contains a DAC chip that, according to several tests, competes with dedicated devices in the 50-Euro range. 24-bit, 48 kHz. No headphone amplifier, no extras—just clean signal conversion. If you have a low-impedance headphone and just want to test whether an external DAC makes any difference at all: this is your entry point. Nine euros at risk.

The Classic: iFi Zen DAC V2 (from 189 Euros). Desktop DAC with headphone amplifier. Burr-Brown chip, PCM up to 32-bit/384 kHz, DSD256 support, MQA decoder. In practical terms: it can play back anything you throw at it. The 4.4-mm Pentaconn output delivers balanced amplification, while the 6.3-mm jack provides traditional single-ended output. TrueBass switch for a subtle analog bass boost. The Zen DAC V2 has been the go-to recommendation in forums for years.

The best DAC isn’t the most expensive one. It’s the one you forget is there because you’re only hearing the music.

The All-Rounder: FiiO K7 (from 200 Euros). Dual AK4493SEQ chip, USB/optical/coaxial/RCA inputs, 4.4-mm balanced and 6.35-mm single-ended outputs. The K7 can drive demanding headphones up to 300 ohms with 560 mW. Signal-to-noise ratio: over 120 dB. What sets the K7 apart: it has so many inputs you can connect your PC, console, and TV simultaneously. A DAC for everything.

What You Don’t Need

A 500-Euro DAC if your headphones cost 80 Euros. A chain is only as strong as its weakest link. That link shouldn’t be your headphones.

A USB DAC if you only listen over Bluetooth. Bluetooth compresses the signal before it even reaches the DAC. You’re improving a process that immediately gets degraded again. Wired first, DAC second.

Expensive audio cables. A 5-Euro USB cable delivers identical digital data as a 50-Euro one. Digital is digital. Spend the money on a better DAC or headphones instead.

♫ Signal Path – Tracks That Reveal the Difference

Songs with subtle details that a good DAC can extract from the mix.

Radiohead – Everything in Its Right Place The synth layers only separate clearly with precise conversion
Massive Attack – Teardrop The harp in the intro sounds three-dimensional through a good DAC
Billie Eilish – everything i wanted Subtle sub-bass that disappears over laptop DACs
Khruangbin – August 10 Three instruments, zero compression. The perfect DAC test

Q&A after the show

Click a question to expand the answer.

What’s the difference between a DAC and a headphone amplifier?

A DAC converts digital data into an analog signal. A headphone amplifier takes this analog signal and boosts it so your headphones play loud enough. Many desktop DACs like the iFi Zen DAC V2 or FiiO K7 have both built in. If your headphones have high impedance (over 100 ohms), you need both. For low-impedance in-ears, the DAC alone is often sufficient.

Do I need a DAC for Spotify?

Yes, you’re already using one. The real question is whether an external DAC improves sound quality. Since September 2025, Spotify also streams in lossless quality. This means the app now delivers enough data quality to benefit from a better DAC. With earlier compressed formats, the difference was smaller. Short version: With Spotify Lossless and headphones costing over €100, an external DAC is worth it.

What does “balanced” mean on a DAC output?

A balanced output transmits the audio signal over two separate lines with opposite polarity. Interference picked up along the cable is canceled out at the receiving end. Result: less noise, greater dynamics. The typical connectors are 4.4 mm (Pentaconn) or 2.5 mm. You need headphones with a matching cable to take advantage of this feature.

Does a DAC make sense with Bluetooth headphones?

No. Bluetooth headphones have their own built-in DAC. The signal is sent digitally via Bluetooth from your device and only converted inside the headphones themselves. An external DAC connected to your laptop won’t help here, because the signal doesn’t pass through it. An external DAC only makes sense with wired headphones.

Elias Kollboeck

Editorial Team, IBS Publishing