?? = I don't know what the acronym stands for, or I don't have a good explanation.
The color green
means a manufacturer/retailer or a manufacturer/retailer related term.
The color red
means a movie. A bigger list of movie acronyms is here
AM - Accelerometer - A device that measures acceleration. Instrument used for measuring the vibrations from a tactile transducer, or from a subwoofer.
ARC - Audio Return Channel - Device technology that uses a single HDMI connection to send Dolby Digital, PCM, or DTS audio from a TV to the AVR (or soundbar). Without ARC, 2 HDMI cables would be needed: AVR to TV, TV to AVR. All HDMI cables will support ARC functionality when connected to ARC-enabled devices.
ASIO - Audio Stream Input/Output - a computer sound card driver protocol for HDMI audio specified by Steinberg GmbH, providing a low-latency and high fidelity interface between a software application and a computer's sound card. Used in REW to control HDMI. ASIO Website
- Anthem Room Correction - Anthem's AVR room correction solution.
AV - Audio Video.
AVR - Audio Video Receiver.
AVS - AVS Forum began back in 1999, when home-theater buff David Bott decided to launch a Web-based forum for like-minded aficionados in collaboration with online retailer AV Science, from which the forum's name was derived.
BB - Baltic Birch - Material sometimes used in subwoofer cabinets due to its resistance to flexing.
- Best Buy - Electronics / entertainment retailer. Website
- Black Hawk Down - 2001 action/drama movie.
- ButtKicker - Brand of tactile transponders. Website
- Battle: LA - 2011 action/sci-fi movie.
- Batman versus Superman - 2016 action/sci-fi movie.
- Captain America: Civil War - 2016 action/sci-fi movie.
CEA2010 - Industry standard for measuring output of powered subwoofers.
- Cross Spectrum Labs - Seller of microphones, sound level meter, and MiniDSP 2x4. Website
dB - Decibel - A unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a logarithmic scale. In general use - a degree of loudness. 0 dB is no sound.
dBfs - Decibels relative to Full Scale - A unit of measurement for amplitude levels in digital systems. 0 dBFS is the level of a signal that is at the maximum level your system can cope with without clipping the tips of the waveform. So -10 dBFS means a level that is 10 decibels lower than the maximum level your system can handle. In summary - decibels are used to describe differences or changes in level. 0 dB means 'no change'. Values in dBFS are used to describe signal levels in comparison with the highest level your system can handle.
- Digital Cinema Auto Calibration - In certain of Sony's AVRs, a feature that does room correction. There are different versions of DCAC that have different features.
- Dolby Digital - A series of lossy audio codecs by Dolby Laboratories. The abbreviation is often combined with the channel count, like DD 2.0 or DD5.1. Dolby Digital is the common version usually with 5.1 channels.
DEQ - Dynamic EQualization -Adjustment of specific frequencies based on the playback volume level.
DF - Down Firing - Subwoofer design where the driver is vertically pointed downwards (toward the ground), instead of along the horizon.
DIY - Do It Yourself - Build your own equipment.
- Dolby Pro Logic - A series of audio codecs by Dolby Laboratories. Article
DSP - Digital Signal Processor - An electronics device using DSP chip(s) in order to measure, filter and/or compress continuous real-world analog signals.
- Dolby Surround Upmixer - Dolby Surround is old sound codec, but in 2014 Dolby has re-used the name as part of its Atmos bundle of technologies. DSU is an upmixer designed to function with traditional channel-based layouts, as well as Atmos enabled layouts that include overhead or Atmos-enabled speakers. It processes native stereo, 5.1, and 7.1 content. Dolby Surround is a total replacement of Pro Logic.
Read more at http://www.soundandvision.com/conten...y65eudAxY3D.99
- Digital Theater Systems - A series of digital sound technologies (codecs) owned by the company of the same name. The acronym means Digital Theater Systems, and is a backronym for Dedicated To Sound. Website
- Deepwater Horizon - 2016 action historical movie.
ELC – Equal Loudness Contour (or Curve) - Use of an ELC is an attempt to make all frequencies sound the same loudness. This is because humans perceive lower frequencies and higher frequencies (but less so) to sound not as loud as the frequencies around 1-5 kHz, particularly when at lower listening levels. Thus there are different contours for different listening levels. Often called a Fletcher-Munson curve. Some old stereos had a “loudness” button which invoked compensation based on an ELC. On a common sound level meter, A and C weighting are uses of different db ELCs.
- Edge Of Tomorrow: Live Die Repeat. 2014 action/sci-fi movie.
EQ - Equalization - Process (or settings) to account for differences in speakers placement, speaker capabilities, speaker distance, and room effects (on the sound waves), in order to try to attain "better" sound. Mostly synonymous with Room Correction, but EQ is perhaps less concerned about the room.
ESL - Electro Static Loudspeaker - Speaker design which uses a thin flat membrane sandwiched between two electrically conductive grids. These speakers often look tall, skinny, very thin and semi-transparent.
F3 - Frequency 3dB - The frequency at which the driver's output is 3dB below its flat response.
FFT - Fast Fourier Transform - A algorithm that allows conversion between a time-domain analog signal and a digital representation of it in the frequency-domain (which has amplitude and phase data). 'Fast' means it is not slow. 'Fourier' was pioneering mathematician. 'Transform' means it changes.
FL - Front Left - Speaker location.
FLR - Front Left Right - Two front speakers and their location.
- Flight Of The Phoenix - 2004 action movie.
FR - Front Right - Speaker location.
FR - Frequency Response - Usually a Hertz range between which a speaker can accurately play an audio signal. Said to be about the quality of the sound.
- Green Glue - Noiseproofing compound. Website
GTG - Get To Gether - Meetup of some like-interested folks.
HPF - High Pass Filter - The frequencies high
er than that number are pass
ed through. The frequencies lower than the cutoff frequency are attenuated (e.g. reduced, at a rate specified by filter designer). There could be a HPF on a subwoofer, for controlling the signal sent out to surround speakers from the sub.
- Hacksaw Ridge - 2016 action historical movie.
- Hsu Reseach - Company that manufacturers and sell subwoofers and speakers. Company is named for founder Dr. Poh Ser Hsu. Website
HT - Home Theater - Your audio visual equipment and setup, and/or the "special" room it is in.
HTiB - Home Theater In a Box - A pre-packaged assemblage of speakers (often a 5.1 speaker setup) and perhaps a AVR. Usually the first step in a first "Home Theater".
- How To Train Your Dragon - 2010 animated fantasy movie.
HZ - Hertz - Unit of frequency defined as one cycle per second. Examples: 20 Hz is twenty cycles per second. Deep bass. 20 kHz is twenty thousand cycles per second. High treble. In general humans can hear sounds between 20 Hz and 20 kHz.
IB - Infinite Baffle - Specifically it means to mount the loudspeaker driver in a VERY large sealed enclosure. But often it is used as a generic term for sealed enclosures of any size, the name being used because of the ability of a sealed enclosure to prevent any interaction between the forward and rear radiation of a driver at low frequencies.
- ICEpower - Manufacturer of subwoofer amplifiers. Website
ID - Internet Direct. Company that sells its products via the Internet (not via brick and mortar stores).
- Company (owned by Harmon) that sells audio and associated products (including subwoofers). Name is from founder's initials: James Bullough Lansing. Website
- JL Audio - Company that sells audio products, especially subwoofers. Name is from first name initials of founders: James Birch and Lucio Proni. Website
- JTR Speakers - Company that manufacturers and sells subwoofers and speakers. Website
LCR - Left Center Right - Three front speakers and their location.
LF - Low Frequency - Non-specific term perhaps meaning audio under 200 hertz maybe down to 20 Hertz. Said to provide kick in the chest.
- Live Free or Die Hard - 2007 Action/adventure movie.
LFE - Low Frequency Effects - Technically a dedicated audio channel on a soundtrack. The . 1 in 5.1 or 7.1. In contrast to the main channels, the LFE channel delivers bass-only information (<120 Hz). All, some, or none of this may be directed to a subwoofer, depending on if there is a subwoofer, if the other speakers can reproduce the frequencies in the channel, and/or if bass management is engaged in the AVR. The signal in the LFE channel is calibrated during soundtrack production to be able to contribute 10 dB higher SPL than the same bass signal from any one of the screen (front) channels. Also a general term meaning bass.
LLT - Large and Low-Tuned, ported - Description of many subwoofers. Opposite would be small, sealed, high-tuned subwoofer. Detailed article
- Lord Of The Rings - Trilogy of fantasy films.
LP - Listening Position (or Listener's Position)
LPCM - Linear Pulse Code Modulation - A common industry method used to digitally represent sampled analog signals. Sometimes called Linear PCM or PCM.
LPF - Low Pass Filter - The frequencies low
er than that number are pass
ed through. The frequencies higher than the cutoff frequency are attenuated (e.g. reduced, at a rate specified by filter designer). On a subwoofer, a LPF is often a control (expressed by its hertz numerical setting) that allows to pass in the audio (coming from the AVR on the .1 channel) that is lower than that number. In the past, the .1 channel (coming from the AVR) only had 3 Hz to 80 Hz. But now days, that may not be true, so the common practice is to set the subwoofer's LPF as high as possible (like 120 Hz, or higher).
M2TS - MPEG-2 Transport Stream - Filename extension for blu-ray audio video files.
MA - Master Audio - A "lossless" codec by the DTS company. A competitor lossless codec to TrueHD by Dolby company.
MA - Motion Actuator - Device designed to convert audio signal into movement ("shaking"). Usually attached to furniture. Used for tactile feel of bass.
MB - Mid Bass - Frequencies maybe around 50-100Hz??
MBM - Mid Bass Module - A woofer that is optimized for mid bass frequencies (approximately 50-100 Hz).
- Multi-Channel ACoustic Calibration - In certain of Pioneer's AVRs, a featured system that does room correction. There are different versions of MCACC that have different features.
MBTR - Mid Bass Tactile Response - Tactile response (that is the chest pounding feeling) is thought to be caused by frequencies around 50-100 hertz.
MDF - Medium Density Fiberboard - Engineered wood product that is oft used in subwoofer cabinets due to its resistance to flexing.
MLP - Main (or My) Listening Position - Intended best seat for best audio (if everything is done correctly).
- Mad Max Fury Road - 2015 action/sci-fi movie.
MLV - Mass Loaded Vinyl - High density vinyl barrier fabric used in walls, ceilings, floors, cars to dampen sound transmission.
- Mad Max: Fury Road - 2015 sci-fi action movie.
MSO - Multi Sub Optimizer - Free software program used to attempt to optimize the bass response of audio systems using multiple subwoofers. Website
MTM - Midrange-Tweeter-Midrange - common driver arrangement in a center channel speaker. Wikipedia article
MV - Master Volume - Usually refers to decibels setting of receiver volume.
NF - Near Field - Refers to being close to the speaker, like using a subwoofer as an end table at the main listening position.
OB - Open Baffle - A speaker design which is distinguished by the ?lack? the speaker box. Think a typical speaker, and take away the top, bottom, sides and back of the box, leaving only the front (where the driver is mounted). They are typically used for music-only type applications as they have the ability to be "more accurate" due to the lack of cabinet resonance. For an average home theater, an open baffle speaker removes "box coloration" but adds "room coloration."
- OmniMic - Microphone and software by Dayton Audio (and sold by other resellers), that is often used for audio system tuning. Perhaps similar to UMIK and REW.
OP - Original Poster - Person that started the thread.
- Perfect Bass Kit - Bass equalization product offering from Paradigm, MartinLogan, Anthem.
PCM - Pulse Code Modulation - A common industry method used to digitally represent sampled analog signals. Sometimes called Linear PCM or LPCM.
PEQ - Parametric EQualizer - Parametric equalizers are multi-band variable equalizers which allow users to control the three primary parameters: amplitude, center frequency and bandwidth. The amplitude of each band can be controlled, and the center frequency can be shifted, and bandwidth can be widened or narrowed.
- Pro Logic - An series of audio codecs by Dolby. Article
- Passive Radiator - Driver powered solely by sound pressure produced by powered driver.
- Pressure Response - The component of sound pressure that affects tactile response. Pressure Response correlates to Tactile Response derived acoustic coupling and how that measures throughout the room.
- Power Sound Audio - Company that manufacturers and sells speakers and subwoofers. Website
- Company that manufacturers and sells speakers and subwoofers. Named after founders: Paul and Sue Barton. Website
PSD - Power Spectral Density - Graph that shows at which frequencies there are vibrations at what level (distinguished by color). Used by ULFers. X axis is frequency (lower on the left). Y axis is time (later on the top). Color is sound level, with "hotter" colors meaning more dBs.
Q - Q factor - 1. In audio it is most used to describe the bandwidth of a filter: the higher the number, the narrower than bandwidth. 2. Some SVS subs have a "Q" control knob which adjusts the resonant bandwidth of the subwoofer.
- Reaction Audio - Company that manufacturers and sells speakers and subwoofers. Website
RC - Room Correction - Process (or settings) to account for differences in speakers placement, speaker capabilities, speaker distance, and room effects (on the sound waves), in order to try to attain "better" sound. Mostly synonymous with Equalization, but perhaps RC is more concerned about the room
RCA - Named after original manufacturer: Radio Corporation of America - Type of audio connector (and by extension, the cables) that is differentiated by it being "unbalanced". As opposed to XLR connector (which is balanced).
- REL Audio - Company that manufactures and sells subwoofers. Name is from initials of founder Richard Edmund Lord. Website
REQ - Room EQualization - Process (or settings) to account for differences in speakers placement, speaker capabilities, speaker distance, and room effects (on the sound waves), in order to try to attain "better" sound. Mostly synonymous with Equalization, but perhaps REQ is more concerned about the room.
REW - Room EQ(ualization) Wizard - Free software used to measure audio. REW
RFI - Radio-Frequency Interference – unwanted audio noise generated by an external source (such as: cell phone, thunderstorm, the Sun, garage door opener).
RG - Room Gain - A rising, low-end (frequency) response, most common in a smaller room.
RMS - Root Mean Square - The RMS wattage of the subwoofer indicates the amount of power that can handled on a continuous basis.
- Spears And Munsil. Stacey Spears and Don Munsil. The Spears & Munsil High Definition Benchmark, 2nd Edition disc, that is used by consumers to calibrate their displays. Website
- Stereo Integrity - Company that manufactures and sells subwoofers and speakers. Website
SME - Subject Matter Expert - The person who knows
- Star Wars: the Force Awakens - 2015 action/sci-fi movie.
- Star Wars: The Force Awakens - 2015 action/sci-fi movie.
- Star Wars: The Last Jedi - 2017 action/sci-fi movie.
SPL - Sound Pressure Level - Usually refers to measuring the decibels with a SPL meter. Technically it is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure, caused by a sound wave, as measured by a microphone.
SQ - Sound Quality - "Sound quality is typically an assessment of the accuracy, enjoyability, or intelligibility of audio output from an electronic device." (Liberated from Wikipedia.)
- Star Trek - 2009 action/sci-fi movie.
- SV Sound. Company that manufacturers and sells speakers and subwoofers. Original company name was SV Subwoofer. SV was an acronym for founders' (Ron Stimpson and Tom Vodhanel) last name. Website
SW - Subwoofer.
TA - Time Align - Have the audio from different speakers arrive at the main listening position at the same time.
- Terminator: Genesis - 2015 action/sci-fi movie.
THD - Total Harmonic Distortion - THD is used to characterize the linearity of audio systems and the power quality of electric power systems. Distortion factor is a closely related term, sometimes used as a synonym.
- [Tomlinson Holman X (crossover) or eXperiment]. Note: THX is not intended as an abbreviation, but as a noun - THX is an audio standard developed by Lucasfilm audio engineer Tomlinson Holman. THX is a standard as well as the name of the company. Their purpose is "to provide a high-quality, predictable playback environment to ensure that any film soundtrack mixed in THX will sound as near as possible to the intentions of the mixing engineer."
- The Incredible Hulk - 2008 action/sci-fi movie.
TR - Tactile Response - Refers to what is felt indirectly.
TR - Transient Response - A transient is a short duration, high level sonic energy peak, such as a sudden hand-clap or snare drum hit. Transient Response refers to the ability of a device to handle and faithfully reproduce transients.
TRS - Tip Ring Sleeve - Type of audio connector, and, by extension, the attached cable. Also commonly called headphone jack, or microphone jack. When used in stereo applications, the ring contact is the right audio, the tip contact is the left audio, and the sleeve is the ground. When used for balanced gear the tip & ring send the same signal but out of phase. When used for unbalanced mixer inserts the tip is for send and the ring is for return.
T/S - Thiele/Small Parameters - A set of electromechanical parameters that define the low frequency performance of a driver. Named after the two people who first authored them. Xmech is one such parameter.
TT - Tactile Transducer - A electro-mechanical device that is used to create vibrations in response to the audio signal (as opposed to making sound). Also known as a "bass shaker". Commonly known brand is ButtKicker.
TT - Turntable - Also known as a record player. Device that turns (or "spins") records (most often vinyl) at a set speed, its cartridge tracks the groove of the record and detects the physical variations therein, and those variations are transformed into analog audio signals.
ULF - Ultra Low Frequency - Below 20 Hz. ULF is said to provide weight/ear popping.
- Usb MICrophone - UMIK-1 is a calibrated measurement microphone from miniDSP (and other resellers) for PCs/laptops (via the USB connection). Often used for audio system tuning, such as for the REW software program.
VS - VibSensor - An android/iOS app
(for a cell phone) that uses the internal accelerometer to measure vibration (i.e. tactile response). Often used by ULF enthusiasts.
- Variable Tuning Frequency - Model number component of certain HSU subwoofers. Ported subwoofers have a tuning frequency, and for subwoofers with more than one port that can be plugged, the tuning frequency is said to be variable (because plugging different number of ports changes the tuning frequency).
WAF - Wife Acceptance Factor - Often a very important limiting resource as to loudness, spending, decorating, vibrations.
WG - Wave Guide - Speaker design that sends sound through a channel (wave guide) in order to amplify the sound.
- War Of The Worlds - 2005 action/sci-fi movie.
- World War Z - 2013 action/sci-fi movie.
- maXimum (mechanical) LIMit - Measurement of how far the speaker's voice coil can move in one direction (its 'excursion') at which point it would hit a mechanical (i.e. physical) limit. Same as XMECH
. See post 44
for a better technical explanation.
XLR - X series Locking Rubber - Type of audio connector (and by extension, the cables) that is differentiated by it being "balanced". As opposed to RCA connector (which is not balanced).
- eXcursion (linear) MAXimum - Measurement of how far the speaker's voice coil can move in one direction (its 'excursion') while maintaining a linear (i.e. distortion-free) response. This maximum excursion distance is defined by manufacturers in different ways, such as the point when >=10% THD starts to occur, or in mechanical terms. See post 44
for a better technical explanation.
- maXimum MECHanical limit - Measurement of how far the speaker's voice coil can move in one direction (its 'excursion') at which point it would hit a mechanical (i.e. physical) limit. Same as XLIM
. See post 44
for a better technical explanation.
XO - Cross Over - Hertz value at which point the audio signal is switched from one speaker/driver to another.
- Yamaha Parametric Acoustic Optimizer - In certain of Yamaha's AVRs, a feature that does room correction. There are different versions of YPAO that have different features.