What is an Audio DAC and Does it Improve Phone Sound

Ever noticed your headphones sound different depending on which phone you use? The answer lies in the DAC. DAC stands for Digital-to-Analog Converter and it’s the chip responsible for converting the digital music stored on your phone into analog signals your headphones can reproduce. I’ve been researching portable audio for years and today I’ll explain what a DAC is, how it affects your phone’s sound, and whether it’s worth buying an external one.

Table of contents

What is a DAC and how does it work

Every digital audio file (MP3, FLAC, AAC) is numbers: a sequence of ones and zeros representing sound. Your headphones don’t understand numbers — they understand analog electrical signals. The DAC is the translator between the two worlds.

Think of it this way: the digital file is a recipe (ingredients and quantities). The DAC is the chef that turns that recipe into an actual dish (analog signal). A bad chef makes a mediocre dish from a good recipe. A great chef can work wonders with the same recipe.

The process is:

1. The phone’s processor reads the digital file.
2. The DAC converts digital data into an analog signal.
3. An amplifier boosts the signal to be strong enough.
4. The signal reaches your headphones and becomes sound.

Each step matters, but the DAC is fundamental because poor digital-to-analog conversion ruins everything else.

Your phone’s internal DAC

All phones have an integrated DAC. Quality varies enormously by model:

Budget (basic DAC)

Budget phones usually have DACs integrated into the processor chip. They’re functional but limited. Sound is fine for Spotify in normal quality, but doesn’t take advantage of quality headphones.

Mid-range (decent DAC)

Phones like Samsung Galaxy A series or Xiaomi mid-range have improved DACs. Sound is good for most users.

High-end (advanced DAC)

Samsung Galaxy S series uses dedicated high-quality DACs. OnePlus and some models have specific audio chips. The jump in quality is noticeable, especially with high-resolution files.

The exception: LG

LG was the last manufacturer to include high-end dedicated DACs (with ESS Sabre chips). Their last models like the LG V60 had audio quality no other phone has matched. A pity they left the phone business.

External DAC: Is it worth it?

If you’re looking for a significant quality jump, a portable external DAC is the solution. It connects to your phone’s USB-C port and replaces the internal DAC with a much better one.

When is it worth it?

• You have quality headphones (>$100)
• You listen to high-resolution music (FLAC, MQA)
• You notice your phone’s sound is “flat” or “boring”
• You want more volume without distortion

When is it not worth it?

• You use Bluetooth headphones (Bluetooth DAC is independent)
• You listen to low-quality MP3s
• Your headphones are budget
• You don’t notice sound differences between devices

Best portable DACs in 2026

FiiO BTR7 (~$120)

My main recommendation. It’s a DAC + Bluetooth amplifier with ESS Sabre chip. Works via USB-C cable and Bluetooth LDAC. Versatile with excellent sound.

Apple USB-C DAC (~$10)

Yes, you read that right. Apple’s USB-C adapter has a surprisingly good DAC for the price. It’s not audiophile, but for $10 it’s unbeatable. Compatible with Android.

iFi GO link (~$60)

Excellent value for money. Dedicated DAC with integrated amplifier. Warm and detailed sound. Very compact.

Helm Bolt DB12 (~$50)

Ultra compact. Connects directly to USB-C without a cable. Has integrated amplifier. Clear and powerful sound for its size.

FiiO KA5 (~$100)

For those seeking maximum quality in dongle form. Dual DAC chip, MQA support, and sound that competes with desktop DACs.

Comparison table of portable DACs

How to connect an external DAC to your phone

Via USB-C

1. Connect the DAC to your phone’s USB-C port.
2. Android should detect it automatically.
3. Go to Settings > Sound > Audio output and select the DAC.
4. Play music and notice the difference.

Recommended settings

1. Enable Developer Options if not already active.
2. Go to Developer Options.
3. Look for “USB audio routing” or “USB sample rate.”
4. Select the highest sample rate your DAC supports.
5. Disable any software equalizer to hear the DAC’s pure sound.

Pro-tip: If you use an external DAC, disable the music app’s equalizer (Spotify, etc.) to hear the sound as the DAC processes it. Digital equalizers can worsen quality if not configured properly.

Audio terms explained: what you need to know

The audio world has its own language that can be confusing. Let’s clarify the most important terms so you better understand what a DAC does.

Resolution and sample rate

Digital audio resolution is measured in bits (16-bit, 24-bit, 32-bit) and sample rate in kHz (44.1kHz, 48kHz, 96kHz, 192kHz). More bits and higher frequency means more detail captured in the file. A standard CD is 16-bit/44.1kHz. High-resolution audio starts at 24-bit/96kHz.

A better DAC can reproduce higher resolution files more accurately. Don’t confuse this with “more volume” — it’s about fidelity to the original sound.

Bitrate vs resolution

Bitrate (kbps) measures how much data per second a file has. Spotify in high quality uses 320kbps in Ogg Vorbis format. Tidal HiFi offers lossless FLAC (up to 1411kbps). A better DAC makes better use of that additional data, but can’t recover what compression discarded.

Headphone impedance

Impedance (measured in ohms, Ω) indicates how much resistance your headphones offer to the electrical signal. Low impedance headphones (16-32Ω) are easy to drive and sound good with any source. High impedance headphones (150-600Ω) need more power and benefit enormously from a DAC with a dedicated amplifier.

If your headphones are 32Ω or less, your phone’s internal DAC is probably sufficient. If you have 250Ω studio headphones, you need an external amplifier, period.

How to test if an external DAC makes a difference

Before spending money, how do you know if you’ll actually notice the difference? Here are the tests I recommend.

Test 1: A/B with the Apple DAC

The Apple USB-C adapter costs about $10. Connect it to your phone, plug in your headphones, and listen to a song you know well. Then remove the adapter and listen to the same song directly from your phone’s port. If you notice a difference (more detail, better instrument separation, more space), a pricier DAC will give you even more improvement.

Test 2: High-resolution file

Download a free high-resolution FLAC file (sites like 2L offer demos). Listen to it first with the internal DAC, then with an external DAC. High-resolution files reveal more difference between DACs than MP3s do.

Test 3: Closed-back headphones in a quiet place

The difference between DACs is best noticed in absolute silence with closed-back headphones that isolate external noise. On the street or subway, ambient noise masks the subtleties a good DAC provides.

Pro-tip: Don’t buy a $200 DAC if your headphones cost $20. The weakest link in the chain determines final quality. Invest in good headphones first, then get a DAC that takes advantage of them.

Recommended accessories for your DAC

A DAC alone isn’t enough if you want the best experience. These accessories make a difference.

Quality USB-C cable

The cable that comes with the DAC is usually basic. A quality USB-C cable with good shielding reduces interference and electrical noise. You don’t need to spend a fortune — $15-20 cables from recognized brands are sufficient.

USB-C to USB-A adapter

If you want to use your portable DAC with a computer that only has USB-A ports, you’ll need a simple adapter. Most portable DACs work perfectly with adapters.

Case or pouch

Portable DACs are small and easy to lose. A silicone case or small pouch protects the device and prevents scratches in your pocket.

Suitable headphones

As I mentioned, the DAC is only as good as your headphones. If you have a $100 DAC with $15 headphones, you’re wasting potential. Closed-back over-ear headphones in the $100-200 range are the ideal complement for a portable DAC.

FAQ

Does a DAC improve sound with Spotify?

Yes, but moderately. Spotify uses compression (Ogg Vorbis 320kbps) that already lost information. A DAC improves the conversion of what it receives, but can’t recover what compression lost.

Do Bluetooth headphones have their own DAC?

Yes. Bluetooth headphones have their own integrated DAC. The phone’s external DAC doesn’t affect Bluetooth sound because the signal is transmitted digitally and converted in the headphone.

Does an external DAC drain a lot of battery?

A USB-C external DAC consumes an additional 5-10% battery. Bluetooth DACs drain from their own internal battery.

Do I need a DAC if I have a Samsung Galaxy S?

Probably not, unless you have very demanding headphones. The Galaxy S DACs are high quality. But if you feel something is missing, an external DAC can give that final push.

Conclusion

An audio DAC is an essential component that determines your phone’s sound quality. If you use budget headphones and listen to normal streaming, your phone’s internal DAC is probably sufficient. But if you value audio and have decent headphones, an external DAC for $50-100 can transform your listening experience. Start with the Apple USB-C DAC for $10 to test the difference — if it convinces you, invest in something better. Your music deserves to sound good.