The concepts behind the reviews
Learn hi-fi, one straight answer at a time.
13 evergreen explainers covering the questions that come up in every review on this site - driver topologies, DAC architectures, amplifier classes, impedance and power, speaker placement, and the rest of the vocabulary the catalogue leans on. Each one is written from the same listening chair as the reviews, links to the scored pieces that prove the point, and stays deliberately free of "best of" lists - that's what the buying guides are for.
Fundamentals
- Balanced vs unbalanced connections What balanced connections really do, when XLR audibly beats RCA in a home system, and why balanced headphone outputs are about power, not noise.
- Hi-res audio: does it matter? What sample rate and bit depth really do, what 16/44.1 already covers, where hi-res genuinely helps, and how to spot fake hi-res files before paying twice.
Headphones
- Headphone burn-in: fact or myth? Where burn-in is real physics, where it's auditory acclimation, what the measurements show, and how to test your own ears honestly before crediting the cables.
- Headphone impedance & sensitivity What ohms and dB/mW really tell you, how to read them together, and how to calculate the power your headphones need - with worked examples from real gear.
- IEMs vs over-ear headphones In-ear monitors and full-size headphones solve different problems. How fit, isolation, soundstage, and drivers differ - and which suits your listening life.
- Open-back vs closed-back headphones What open-back and closed-back actually change - soundstage, isolation, bass - and how to pick the right design for your room, with examples from tested reviews.
- Planar magnetic vs dynamic drivers How planar magnetic and dynamic drivers differ in bass, distortion, weight, and amp demands - and why implementation beats topology, with tested examples.
Speakers
- Bookshelf vs floorstanding speakers How cabinet size really changes bass, placement, and amplifier demands - and why the room should decide between bookshelf and floorstanding speakers.
- Speaker placement & room acoustics The listening triangle, toe-in, boundary distance, room modes, and first reflections - how placement and basic treatment transform a system for free.
DACs
- Do you need an external DAC? What a DAC actually does, when your device's built-in audio is genuinely fine, the real reasons to upgrade, and where diminishing returns begin.
- R-2R vs delta-sigma DACs How ladder DACs and delta-sigma converters actually work, why they can sound different, what NOS mode changes, and how to choose - without the mythology.
Amplifiers
- Amplifier classes explained What amplifier classes really describe, how Class A, AB, and D trade heat for purity, where tubes fit, and which spec actually predicts the sound.
- Do you need a headphone amp? When a dedicated headphone amplifier audibly matters, when your phone or dongle is genuinely enough, and how to check your own headphones before spending.
Ready to act on what you learned?
- Browse the review catalogue: every piece scored 0-10 against a published reference list, with the concepts above applied in practice.
- Open a buying guide: curated shortlists where every pick is a scored review - the "what should I buy" companion to the "how does it work" pages here.
- Run the numbers in the free tools: amplifier power, room modes, cable gauge, safe listening levels - the calculators these explainers reference.
- Look a term up in the glossary: one-sentence definitions for every technical term used across the site, when you need a reminder rather than a deep dive.