Sound Quality Issues with Wired Headphones: How to Solve Them with a DAC
Purchasing high-end wired headphones often leads to disappointment as users plug them into their smartphone adapters only to encounter flat, quiet, and indistinct sounds. This phenomenon has become common among many users who hope for quality audio but are met with frustration.
The root of this issue lies not in the quality of the headphones themselves but in the technology used in mobile phones, which simply cannot drive serious audio equipment effectively. Smartphone manufacturers have been cutting costs on audio chips for years, prioritizing cameras and screens instead. Inside the thin casing of these devices, a chaotic environment for sound exists—electromagnetic interference from the processor and modem generates so much 'noise' that even an expensive audiophile track can turn into a muddled mess.
To rectify this situation, it is essential to move the signal processing outside the smartphone. This is where portable digital-to-analog converters (DACs), commonly referred to as 'dongles' or 'whistles,' come into play. This tiny device takes on the job of processing the binary code of your music and converting it into a clean analog signal. Essentially, you are connecting an external professional sound card to your phone, bypassing the weak built-in components of the gadget.
When selecting such an upgrade, it is critically important to pay attention to the impedance rating of your headphones. If you have a standard 'headset,' any basic amplifier will suffice. However, for monitor models with high impedance (for example, 150 or 250 ohms), a DAC with high output power will be necessary. Otherwise, the sound will remain quiet, and the bass will be lackluster.
It is also worth considering the type of power supply. Most compact models 'drain' your smartphone's battery, which can deplete it one and a half times faster. If you plan to listen to music for hours, it is better to look for models with a built-in battery, like those in the FiiO lineup. They are slightly larger but provide cleaner energy and do not exhaust your phone's battery.
It is crucial to understand that hardware is only half the battle. If you are listening to compressed files from standard streaming services, where quality is sacrificed for bandwidth savings, no DAC will perform miracles. For a real leap in quality, you will need to switch to services that support Lossless or Hi-Res Audio formats (such as Apple Music, Tidal, or Qobuz). Only then will you be able to hear the difference between cheap plastic and true metal.
A separate bonus of portable amplifiers is their versatility. Most of these devices work perfectly with laptops and tablets via USB-C adapters. This allows users to achieve studio-level sound even on an office laptop with a cheap motherboard.
The main rule here is simple: the less signal processing that occurs inside your smartphone, the closer you get to the sound that the sound engineer intended in the studio. The end result is often so impressive that returning to standard connections through cheap adapters becomes physically impossible.