A DAC turns the digital audio from a phone, computer or TV into an analog signal; a headphone amp boosts that signal enough to drive headphones. Many products do both. Every model on this site is rated from the measurements Audio Science Review publishes, so this guide explains what those numbers mean for what you hear.
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Step 1: Decide Whether You Need One at All
Sensitive in-ear monitors and most wireless headphones don’t need anything extra. A separate DAC or amp helps when your device has no headphone jack, when the jack hisses with sensitive IEMs, or when your headphones need more power than a phone can supply. Each headphone page on this site lists its sensitivity and impedance, and the cons call out models that need more power than usual.
Step 2: Match the Power to Your Headphones
Output power into 32 ohms is the number that decides whether an amp can play your headphones loud enough. Most in-ears need only a few milliwatts, so any USB-C dongle will do. Inefficient planar magnetic headphones and some high impedance models can need several hundred milliwatts or more, which points to a desktop combo or a standalone headphone amp. Our ratings reward power up to about 1 W into 32 ohms; beyond that, extra power only matters for the hardest to drive headphones.
Step 3: Understand SINAD
SINAD measures how far noise and distortion sit below the music, in decibels. Higher is cleaner. Around 115 dB, a device’s own noise and distortion are inaudible, which is why our ratings give full credit at that level and nothing extra above it. Below about 90 dB, problems such as hiss with sensitive in-ears become more likely.
Step 4: Pick the Connections You Need
Balanced headphone outputs (4.4 mm or 4-pin XLR) usually deliver more power, and balanced XLR line outputs suit studio monitors. Optical and coaxial inputs connect a TV or console; Bluetooth lets a phone stream without a cable; a battery makes a unit portable. Each card lists inputs, outputs and features, and the balanced, Bluetooth and battery powered pages collect every match.
Step 5: Don’t Pay for Inaudible Differences
Above about 115 dB SINAD, a more expensive DAC won’t sound cleaner. Spend on the power and connections you actually need, and on headphones, which make a far bigger audible difference. See the best headphones for those.
Measurements: Audio Science Review. Each model page links to the review its numbers come from.