📖 Reference
Audio Gear Glossary
161 termsEvery audio term explained in plain English — with product recommendations.
161 terms
🎙️Microphones13
Phantom PowerA 48-volt DC supply sent through an XLR cable to power condenser microphones without a separate power source.Condenser MicrophoneA microphone that uses a capacitor (condenser) to convert sound into electricity — more sensitive than dynamic mics but requires phantom power.Dynamic MicrophoneA microphone that uses electromagnetic induction to convert sound into electricity — robust, no phantom power needed, and ideal for loud sources or untreated rooms.Polar PatternThe three-dimensional shape describing where a microphone picks up sound and where it rejects it.Proximity EffectThe bass boost that occurs when a directional microphone is placed very close to a sound source — used creatively by broadcasters for a warmer voice sound.Self-Noise (Equivalent Noise Level)The inherent electrical noise a microphone generates on its own, measured in dB(A) — lower is better for quiet recordings.USB MicrophoneA microphone with a built-in analog-to-digital converter that connects directly to a computer via USB — no audio interface required.Proximity EffectThe increase in bass response when a directional microphone is placed very close to the sound source — used creatively for vocal warmth.Plosive (Pop)A burst of air from 'P', 'B', 'T', and 'K' sounds that hits the microphone diaphragm and creates a low-frequency 'pop' — controlled with pop filters.SibilanceThe harsh, whistling distortion on 'S', 'SH', and 'CH' sounds — controlled with de-esser plugins or proper microphone technique.Self-NoiseThe electronic hiss produced by a microphone's own internal components — lower is better, especially for quiet sources like ASMR and acoustic instruments.Pad Switch (Attenuator)A switch on microphones and interfaces that reduces the input signal level by a fixed amount (usually −10 or −20 dB) to prevent distortion from loud sources.Polar PatternA microphone's directional sensitivity — determines which directions it picks up sound from and which it rejects.
🎛️Audio Interfaces10
Audio InterfaceA device that converts analog audio (from microphones and instruments) into digital audio for your computer — and back again for playback through speakers or headphones.Preamplifier (Preamp)A circuit that amplifies a microphone's weak output signal to a line level usable by recording equipment — built into every audio interface.LatencyThe time delay between a sound being captured by a microphone and being heard through headphones or speakers — low latency is critical for comfortable monitoring while recording.Sample RateThe number of audio samples captured per second during digital recording — 44.1 kHz is the CD standard; 48 kHz is the video standard; 96 kHz is common for high-resolution audio.Bit DepthThe number of bits used to represent each audio sample — more bits means more dynamic range and a lower noise floor. 24-bit is the standard for recording.Direct MonitoringA feature in audio interfaces that routes the mic signal directly to the headphone output with zero latency — bypassing the computer so performers can hear themselves without delay.Gain StagingSetting optimal signal levels at each point in the recording chain to maximize clarity and minimize noise.Bit DepthThe number of bits used to represent each audio sample — determines the dynamic range and noise floor of a digital recording.Sample RateHow many times per second an analog signal is measured during digital conversion — 44.1 kHz (CD) and 48 kHz (video) are the practical standards.DAW (Digital Audio Workstation)Software for recording, editing, mixing, and producing audio — the central hub of any modern recording studio.
🎧Headphones12
Open-Back HeadphonesHeadphones with perforated or open ear cups that allow air and sound to pass freely — delivering a more natural, spacious soundstage but with significant sound leakage.Closed-Back HeadphonesHeadphones with sealed ear cups that isolate the listener from outside noise and prevent sound from leaking out — essential for recording and monitoring.ImpedanceThe electrical resistance of headphones to an audio signal, measured in ohms — low impedance (16–80Ω) is easy to drive from phones and interfaces; high impedance (250–600Ω) requires a dedicated amplifier.Active Noise Cancellation (ANC)Electronic system that uses microphones and speakers to cancel ambient noise in real-time through destructive interference.Bluetooth CodecA compression algorithm that encodes and decodes audio for wireless transmission — determines bitrate, latency, and sound quality.Passive Sound IsolationPhysical blocking of external noise through earcup materials and design — no electronics involved, unlike ANC.Transparency ModeA feature that uses external microphones to pipe ambient sound into headphones so you can hear your surroundings without removing them.Planar Magnetic DriverA headphone driver type using a thin diaphragm suspended between magnetic fields — delivers faster transient response and lower distortion than dynamic drivers.HRTF (Head-Related Transfer Function)How the head, outer ears, and torso filter incoming sound — the brain uses these directional cues to localize sound sources.ImagingThe ability of a system to create the illusion of distinct, localized sound sources within the soundstage.Pinna GainThe acoustic amplification from the outer ear's shape — the folds selectively boost high frequencies, providing directional cues.Virtual SurroundTechnology using HRTF processing to create immersive 3D audio from headphones or limited speakers — tricks the brain into perceiving sound from all directions.
🔊Room Acoustics31
Room AcousticsThe way sound behaves in a physical space — including reflections, standing waves, and reverberation — which significantly affects how recordings and mixes sound.Reverberation (Reverb)The persistence of sound after the original source stops, caused by multiple reflections in an enclosed space — too much room reverb makes recordings sound distant and amateur.Acoustic TreatmentMaterials placed in a room to control reflections, reduce reverb, and manage bass buildup — making recordings cleaner and mixes that translate better to other speakers.Standing Wave (Room Mode)A pattern of fixed peaks and nulls in bass frequency response caused by sound reflecting between parallel walls — makes room acoustics uneven and mixing unreliable.AbsorptionThe process by which a material takes in sound energy rather than reflecting it — porous materials like foam absorb mid and high frequencies to reduce echoes.AcousticsThe science of how sound is produced, transmitted, and received — in audio, it refers to how a room's characteristics affect what you hear.Bass ManagementThe process of routing, timing, and level-matching low frequencies in a multi-speaker system with a subwoofer.Bass TrapsThick acoustic absorbers placed in room corners to reduce low-frequency buildup and standing waves.BoomyExcessive, resonant bass concentrated in a narrow frequency range — often caused by room modes, creating a 'one-note' bass.Comb FilteringAn interference effect creating a series of peaks and dips in frequency response — caused when direct sound combines with a delayed copy.Cumulative Spectral Decay (CSD)A waterfall graph showing how sound energy decays over time at each frequency — reveals lingering resonances.DecayThe way sound fades after its initial peak — in a room, it refers to the persistence of sound due to reverberation.Decay Time (RT60)The time for sound to decrease by 60 dB in a space — long decay causes muddiness; short decay sounds dry.DiffractionThe bending and spreading of sound waves around objects or through openings — why you hear sound from around corners.DiffusionEvenly scattering sound reflections in multiple directions over time — preserves spaciousness while eliminating distinct echoes.Digital Room Correction (DRC)Technology using DSP to analyze room acoustics and apply corrective EQ and timing adjustments to compensate for acoustic problems.Impulse Response (IR)A measurement capturing how a room or device responds to an extremely short, sharp sound — contains frequency, phase, and decay information.Loudspeaker-Room InteractionThe combined effect of speaker placement and room geometry on the sound reaching the listener — the primary target of room correction.MIMO (Multi-Input, Multi-Output)Signal processing treating multiple speakers as a coordinated system — all speakers work together to control room acoustics.Modal Resonance / Room ModeA standing wave at a frequency directly related to room dimensions — creates peaks (boosts) and nulls (cancellations) at specific locations.Null / Cancellation ZoneA location where sound waves arrive out of phase and cancel — creating a 'dead spot' with significantly reduced volume.Pink NoiseRandom noise with equal energy per octave — corresponds more closely to human hearing than white noise for calibration.Reference / Target CurveThe desired frequency response a correction system aims to achieve — not always perfectly flat; often includes a gentle bass boost.ReflectionA sound wave bouncing off a surface — the timing and strength of reflections define a room's acoustic character.Room CorrectionUsing digital analysis and filtering to compensate for acoustic problems caused by room resonances and speaker placement.Room ModeA low-frequency resonance tied to room dimensions — creates peaks and nulls throughout the room, making bass mixing unreliable.Schroeder FrequencyThe transition frequency in a room below which individual room modes dominate — typically 150–250 Hz in home studios.Spatial Room Impulse Response (SRIR)A multi-channel measurement capturing magnitude, timing, AND spatial characteristics of reflections — for advanced immersive audio correction.Sweet SpotThe primary listening position where the system performs optimally — stereo image is focused and frequency response is most balanced.Target CurveThe desired frequency response a correction system aims for — typically with gentle bass boost and treble roll-off.Waterfall Plot3D visualization combining frequency response with decay over time — effectively reveals room resonances and speaker ringing.
🔌Cables & Connectors3
XLR (Balanced Audio Connector)A 3-pin professional audio connector used for microphones, audio interfaces, and studio gear — carries balanced audio to reject electrical interference over long cable runs.Balanced AudioAn audio transmission method using two signal conductors that carry the same signal in opposite polarity — interference picked up by the cable is cancelled at the destination, reducing noise.Y-AdaptorA cable splitting one signal into two or combining two into one — can upset impedance balance between connected components.
🎵General Audio92
GainThe amplification of an audio signal — increasing gain makes the signal louder; too much gain causes clipping and distortion.ClippingDistortion that occurs when an audio signal exceeds the maximum level a system can handle — sounds harsh and is usually unrecoverable.High-Pass Filter (Low-Cut Filter)A filter that removes frequencies below a set point while allowing higher frequencies to pass — used to eliminate rumble, handling noise, and proximity effect.Dynamic RangeThe difference between the quietest and loudest sounds in an audio signal or system — wider is generally better for preserving detail in recordings.MonitoringThe act of listening to audio during recording or mixing — through headphones or studio monitors — to assess quality, adjust levels, and make mix decisions.Frequency ResponseA graph showing how a microphone, headphone, or speaker responds to different frequencies — a flat response is ideal for accurate recording and monitoring.VST / Audio PluginSoftware modules that run inside a DAW to process audio (effects) or generate sound (virtual instruments).Sidechain CompressionA mixing technique where one track's compressor is triggered by another track — most commonly used to 'duck' music when a voice is present.HeadroomThe safety margin between your highest signal peak and the maximum level before distortion — essential for clean recordings.AccuracyHow faithfully an audio system reproduces the original recording — minimal distortion, flat frequency response, and precise timing.Adaptive FilterA DSP algorithm that continuously updates itself based on feedback — used for real-time echo cancellation, feedback suppression, and noise reduction.AliasingDistortion that occurs when a signal is sampled below the Nyquist rate — creates false, unwanted frequencies not present in the original.AmbisonicsA full-sphere surround-sound format capturing sound in directional components — can be decoded for any speaker layout or headphones.AudioSound converted into electrical or digital form for recording, transmission, or playback.BassThe lowest part of the audible frequency spectrum (20–250 Hz) — provides the foundational rhythm and weight of music.Bass RangeThe spectrum of low frequencies, subdivided into sub-bass (below 60 Hz) and upper bass (60–250 Hz).BloatedDescribes sound with excessive, poorly defined mid-bass — thick sounding but lacking clarity and precision.BlurryDescribes sound lacking focus and transient detail — often caused by timing misalignment between drivers or room reflections.Brick-Wall FilterA digital low-pass filter with an extremely steep cutoff slope — prevents aliasing but adds latency.BypassA switch that routes audio around a processor — allows instant A/B comparison between processed and original signal.Calibration MicrophoneA measurement microphone with extremely flat frequency response — used to capture accurate room acoustic data for correction.Calibration ProfileA saved set of measurement data and correction filters for a specific listening environment — allows quick recall of optimal settings.ColourationAny audible alteration to the sound added by a component or room — a colored sound is not neutral and has a distinct character.ConvolutionA mathematical operation applying the acoustic signature of an impulse response to audio — recreates the sound of spaces or applies precise correction.Correction FilterA custom EQ and phase adjustment derived from room measurements — applied in real-time to counteract room and speaker coloration.CrossoverAn electronic or passive network dividing audio into frequency bands — sends lows to woofers, mids to midrange, highs to tweeters.Crossover OptimizationFine-tuning the frequency, slope, phase, and level where audio is divided between speakers and subwoofer — for seamless integration.DAC (Digital-to-Analog Converter)A device converting digital audio (numbers) into analog electrical signals for speakers and headphones.Decibel (dB)A logarithmic unit measuring sound intensity or signal level — 6 dB increase is roughly twice the perceived loudness.Delay CompensationAutomatic process aligning multiple audio channels by offsetting latency introduced by processing — maintains time coherence.DSP (Digital Signal Processor)A specialized microprocessor performing mathematical operations on digital signals — used for EQ, compression, reverb, and room correction.DownsamplingReducing the sample rate of digital audio — requires anti-aliasing filtering to prevent distortion.EnvelopeHow a sound's amplitude changes over time — defined by Attack, Decay, Sustain, and Release (ADSR).FFT (Fast Fourier Transform)A highly efficient algorithm breaking time-domain signals into frequency components — core of spectrum analyzers and convolution engines.Filter BankA set of digital filters splitting audio into multiple frequency bands — essential for graphic EQs, crossovers, and multiband compression.FIR Filter (Finite Impulse Response)A digital filter whose impulse response settles to zero — preserves linear phase (no timing distortion) but may add latency.Fletcher-Munson Curve / Equal-Loudness ContoursShows how human hearing sensitivity varies with frequency and volume — we hear midrange best, bass and treble less so.Golden EarA person with exceptional listening skills — able to discern subtle differences in audio quality through trained critical listening.Group DelayTime lag at different frequencies through a system — excessive group delay smears transients and reduces clarity.Harmonic Distortion (THD)Added frequency components at integer multiples of the original signal — small amounts can sound warm; excess sounds harsh.IIR Filter (Infinite Impulse Response)A digital filter using feedback — achieves steep slopes with low latency but introduces phase shift.Impact / SlamThe visceral, physical sensation of a powerful, fast bass transient — the kick drum you feel in your chest.Impulse ShorteningTechnique limiting the time length of a correction filter — reduces latency and pre-ringing artifacts.JitterSmall, rapid variations in digital clock timing — causes blurring of stereo image and increased noise floor.Kilohertz (kHz)Unit of frequency equal to 1,000 cycles per second — sample rate determines the highest recordable frequency.Line-LevelA standardized signal strength for interconnecting audio equipment — +4 dBu (professional) or −10 dBV (consumer).Linear-Phase EQAn equalizer adjusting frequency magnitudes without altering phase — preserves transient integrity but adds latency.Lossless AudioA compression format (FLAC, ALAC) reducing file size without discarding any audio data — bit-perfect when uncompressed.LoudnessThe perceived intensity of sound — a subjective quality influenced by frequency content, duration, and measured in LUFS.Low-Pass FilterA filter allowing low frequencies to pass while attenuating highs — used for subwoofer crossovers and anti-aliasing.Mid-Tone Range (Midrange)The frequency range where human hearing is most sensitive (250 Hz–4 kHz) — contains the core of melodies, vocals, and instrument definition.Mixed-Phase TechnologyFilter design combining linear and minimum-phase approaches — corrects both magnitude and phase while minimizing latency.Mono (Monophonic)Single-channel audio — the same signal sent to all speakers. Essential tool for checking mix phase compatibility.Multiband CompressionIndependent compression applied to different frequency bands — targets specific problems without affecting the entire spectrum.Notch FilterAn extremely narrow band-stop filter — surgically removes a single problematic frequency with minimal impact on surrounding frequencies.Nyquist FrequencyThe highest frequency accurately captured at a given sample rate — equal to half the sample rate. Frequencies above this cause aliasing.Ohm (Ω)The standard unit of electrical resistance or impedance — fundamental for matching speakers and amplifiers.OversamplingTemporarily increasing sample rate within a DSP — makes filter design easier and reduces certain types of distortion.OverdubbingRecording new performances while listening to previously recorded tracks — allows layering parts for complex arrangements.Parametric EQAn equalizer with three adjustable parameters per band: center frequency, gain (boost/cut), and Q (bandwidth).Peak LimiterA very fast compressor preventing signal peaks from exceeding a set threshold — protects speakers and prevents digital clipping.Perceptual TargetingAudio correction based on human hearing principles — aims for results that sound natural rather than mathematically perfect.PhaseThe timing relationship between waveforms — in-phase signals reinforce; out-of-phase signals cancel.Phase ResponseA graph showing phase shift at different frequencies — linear phase (all frequencies delayed equally) is ideal for preserving transient timing.Pre-RingingArtifact of linear-phase filters — a faint oscillation appearing BEFORE the main transient, perceived as smearing of attack.PsychoacousticsThe scientific study of how the brain interprets sound — foundation of perceptual audio codecs, spatial audio, and loudness standards.Q Factor (Bandwidth)The sharpness of a filter's resonance — high Q affects a narrow range; low Q affects a broad range.ResolutionThe ability of an audio system to reveal fine, low-level details in a recording — subtle textures, ambience, and decay.Smart AcousticsApproach optimizing audio by analyzing all three elements: the Source (content), System (hardware), and Space (environment).Software Defined AudioApproach where core audio functions (traditionally handled by dedicated hardware) are performed by flexible, updatable software.SoundA vibration propagating as an acoustic wave through a medium (air) — the raw physical phenomenon that audio technologies capture and reproduce.Sound ProcessingThe manipulation of an audio signal — from basic volume and EQ to complex effects like reverb, compression, and room correction.SoundscapeThe total acoustic environment of a location — all sounds present, natural and artificial, that create the sonic identity of a place.SpectrogramA visual representation of sound: frequency (Y-axis), time (X-axis), amplitude as color/brightness — reveals patterns invisible in waveforms.STFT (Short-Time Fourier Transform)Fourier transforms on small windowed sections of a signal — provides time-varying spectral data for real-time analysis.Stereo ImageThe perceived spatial placement of sounds between left and right channels — created by level, timing, and spectral differences.Tap CountThe number of coefficients in an FIR filter — higher tap count = more precise control, but more latency and CPU usage.The 3S of AudioA framework: Source (what you play), System (what you play it on), Space (where you play it) — all three define what you hear.Texture (Audio)The perceived surface quality of sound — interplay of micro-details, harmonics, and transients making sound feel smooth, rough, grainy, or liquid.THD+N (Total Harmonic Distortion + Noise)Measurement expressing all harmonic distortion and noise as percentage of output — lower is cleaner.TimbreThe characteristic quality or color of a sound that distinguishes different instruments playing the same note — determined by harmonic content.Time-Domain CorrectionCorrection focusing on when frequencies arrive (timing) — shifts impulse response to reduce smearing from reflections.Tonality / MusicalityThe overall tonal balance — warmth, brightness, or neutrality. Musicality describes engaging, coherent sound beyond mere accuracy.Transfer FunctionMathematical representation of how a system alters magnitude and phase of signals passing through — central to filter and correction design.Treble RangeThe highest audible frequencies (4 kHz–20 kHz) — contributes air, detail, brilliance, and sparkle to sound.UpmixingAnalyzing stereo audio to synthesize surround or height channels — creates immersive playback from legacy 2-channel content.Virtual Room CorrectionDynamic filtering simulating ideal room conditions — adapts in real-time as listening position or content changes.WaveformA 2D graph plotting amplitude over time — zooming in reveals transients, polarity, and zero-crossings for precise editing.White NoiseRandom signal with equal energy at every frequency — used for measurements, sound masking, and synthesis.WindowingApplying a mathematical envelope to measurement data before FFT analysis — reduces spectral leakage and improves frequency resolution.Zero-CrossingThe point where a waveform passes through zero amplitude — editing at these points minimizes clicks and pops.Zero-Latency FilterA minimum-phase or IIR filter with processing delay so small it is imperceptible — ideal for live sound and real-time monitoring.
📖 161 audio terms explained. Browse our guides for practical how-tos.