Headphone sound quality is usually a measurement of accuracy and enjoyability. There is no absolute reference for sound quality. It’s entirely a matter of personal taste. The accuracy of sound quality can be measured by people or tools. But the most objective and accurate audio quality results always come from using tools. This is the most objective way of measuring it. Enjoyability, on the other hand, is totally subjective. Every person has their own preference for what good sound quality is. Some people like neutral, clean sound, while others prefer heavy bass emphasis. When it comes to headphones a lot of people like deep, strong bass but most audiophiles usually prefer more accurate, natural sound. If listening to headphones, earphones, or speakers, you alone decide if something sounds high quality to you. You can find more tips on how to improve headphones here. CONTENTS (click to show more) Subjective Categories of Sound Quality/Sound Signatures There are many different categories of audio quality that people like. The 3 most common are: Bass-heavy, strong emphasis on lower range to get strong, deep bass (What is bass quality?) V-shaped, emphasis on bass and treble to give a more lively and dynamic sound Flat, balanced and neutral sounding, with all frequencies being equal Here’s a spreadsheet of other common types of sound signatures and how they sound. More: Best bass earbuds Best bass headphones Names of Sound Signatures – Spreadsheet Sound signature nameBass (low freq.)Mids (middle freq.)Treble (high freq.)Balanced/Natural/FlatNeutralNeutralNeutralBass-Heavy/BassyEnhancedRecessed /NeutralRecessedMid-FocusedNeutral /RecessedEnhancedNeutral /RecessedBrightRecessed /NeutralNeutral /RecessedEnhancedV-ShapedEnhancedNeutral /RecessedEnhancedWarmEnhancedNeutral /RecessedRecessedDarkNeutralNeutralRecessed This spreadsheet might help you understand the audiophile language and what to expect from the sound quality. This is how a V-shaped frequency response looks like in a graph (Do you see the “V” shape?): Example of a V-Shaped frequency response How is the Accuracy of Sound Quality Measured? There are many tools and methods to objectively measure the quality of the sound, and the most common are: Frequency Range Signal-to-Noise Ratio SNR Spurious-free Dynamic Range SFDR Distortion Ratio SINAD % THD – percent of Total Harmonic Distortion We’re not going into details here, but you can check the links above for a more in-depth explanation. Audiophiles and other audio enthusiasts can determine how specific headphones or speakers will sound with the help of this data. For an average user, this is usually not important as it’s too technical. Do kbps (kilobits per second) Matter for Sound Quality? Yes, the higher the kbps, the higher the sound quality. This is the case for all formats and streaming music. For example, when using Spotify, you have the option of changing the sound quality. On mobile, from Normal 96kbps, High 160kbps, and Extreme 320kbps. You’ll enjoy High-Res Audio’s 9,126kbps a lot more than CD’s 1,411kbps or MP3’s 320kbps, but higher bit rates aren’t yet available for streaming. You can read more about the comparison here. If you have high-quality headphones, you will be able to hear the difference in kbps. Is Music Format Important for Sound Quality? Yes, the format your music is in is very important. If you’re lossy formats, you’re losing sound quality. Try to use a lossless audio format for the best experience. If you care about saving bandwidth the most, MP3 is still the go-to choice while only losing the parts of sound most people can’t hear. But if you care about sound quality more, use FLAC as it’s most efficient while not losing any sound quality. Keep in mind, you need good headphones to be able to hear the difference. Most common audio formats: MP3 – lossy compressed, the go-to format for “good enough” sound quality AAC – lossy compressed, newer and more efficient than MP3 WMA – lossy compressed, competition to MP3, similar to AAC WAV – usually uncompressed FLAC – lossless compressed, the go-to format for all audiophiles who like high-sound quality ALAC – lossless compressed, Apple alternative to FLAC, a bit less efficient but supported by Apple products Lossy formats damage the sound quality to maximize disk space savings. Lossless formats save some disk space but don’t take away from the sound quality. Is Frequency Range of Headphones Important for Audio Quality? Since most headphones are made to roughly fit into the human hearing bandwidth of 20Hz to 20kHz (20,000Hz), checking the range is not very important. Unless you can spot the difference, which means you’re probably an audiophile yourself with many high-end headphones and great hearing. For an average user, it’s not really important. Most people can differentiate between groups of low frequency, middle frequency, and high frequency, and not more than that. Frequency response, or how those ranges are represented, is more important since this defines the sound signature. What’s Good Impedance for Headphones? All wireless headphones have a built-in amplifier and digital-to-analog converter (DAC), so the question probably pertains to wired headphones. Why are My Headphones So Quiet? If your headphones are too quiet, even at max volume, you probably need more power. It’s important to pick headphones with lower impedance (16Ω or 32Ω are most common) if you plan to use them with your smartphone or laptop. For higher impedance, represented by Ohm at 1kHz, you need more power. An amplifier is needed to drive higher-impedance headphones with enough volume. Impedance alone doesn’t affect sound quality directly, but it does affect loudness. Lower-powered smartphones won’t make higher Ohm headphones loud enough, which can be quite annoying. Here are tips on how to improve the sound quality of your headphones and earbuds. Matija FerjanMatija Ferjan is a seasoned audio enthusiast reviewing headphones since 2015. He has personally tested hundreds of headphones and earbuds. He’s an active member of the Headphone Audio community and a true nitpicker, always looking for the “best-value-for-money” headphones.