Frequently Asked Questions
The most-asked questions about headphones and audio gear.
What exactly are headphones and how do they differ from speakers?
Headphones are personal audio transducers that deliver sound directly to the listener's ears through small drivers housed in ear cups or earbuds. Unlike speakers, they create a sealed or semi-sealed acoustic pocket around each ear, which isolates the listener from room acoustics and allows detailed reproduction at lower volumes.
What's the difference between over-ear, on-ear, and in-ear designs?
Over-ear (circumaural) headphones have large cups that fully enclose the ear, on-ear (supra-aural) models rest on top of the ear, and in-ear monitors sit inside the ear canal. Over-ears generally offer the best passive isolation and comfort for long sessions, while in-ears are the most portable and provide strong isolation in a tiny form factor.
What does impedance mean, and why should a newcomer care?
Impedance, measured in ohms, describes how much electrical resistance a driver presents to the signal source. Lower-impedance headphones (around 16–32 ohms) are easy to drive from phones and laptops, while high-impedance models (150 ohms and up) typically need a dedicated amplifier to reach their intended volume and tonal balance.
What's the deal with open-back versus closed-back headphones?
Open-back designs use perforated or mesh ear cups that let sound radiate outward, producing a wider, more natural soundstage but leaking audio and offering little isolation. Closed-back models seal the driver in a solid enclosure, boosting bass response and blocking outside noise, at the cost of a slightly more contained sound signature.
What is a DAC, and do I actually need one?
A digital-to-analog converter translates the digital audio stream from a phone, computer, or player into the analog voltage that drives a headphone. Most modern devices include a basic DAC, but external or higher-end units can reduce noise floor, handle higher-impedance loads, and add subtle tonal character that many listeners find rewarding.
Which headphone models are considered legendary in the hobby?
The Sennheiser HD 600, Beyerdynamic DT 990 Pro, and Audio-Technica ATH-M50x have become near-universal references for their balanced tuning, durability, and the fact that generations of listeners built their reference points around them. In the in-ear world, the Shure SE215 and Sony IER-M7 are frequently cited as benchmarks for value and detail.
What does driver size actually tell me about sound quality?
Driver size (commonly 40 mm, 45 mm, or 50 mm for over-ears) indicates the diameter of the diaphragm that moves air to produce sound. A larger driver can move more air and often produces deeper bass, but tuning, enclosure design, and amplifier pairing matter just as much as the number printed on the spec sheet.
What's the difference between active noise cancellation and passive isolation?
Passive isolation is simply the physical sealing of the ear cup or silicone tip that blocks sound waves from reaching the driver. ANC adds microphones and a processing chip that generate an inverse waveform to cancel ambient noise electronically, which is especially effective against low-frequency droning like airplane engines or HVAC hum.
Who are the major brands a newcomer should know?
The most frequently referenced names include Sennheiser, Beyerdynamic, and Audio-Technica for over-ears; Sony, Shure, and Moondrop for in-ears; and FiiO, Topping, and Schiit for amplifiers and DACs. Each carries a distinct house sound and a dedicated following, so most listeners eventually compare across two or three of them before settling.
Where should a complete beginner start if they want to get into headphones?
A practical first step is choosing a mid-range pair (roughly $100–$250) that matches your use case—wired over-ears for desktop listening, ANC over-ears for commuting, or in-ears for on-the-go—and pairing them with a simple USB DAC/amp if the source is a laptop. From there, listening to reference tracks and A/B-comparing models in that bracket builds an ear for what you actually prefer before spending more.