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Audio Glossary
2.0 speaker system
Your basic setup—two speakers, or satellites, that give you stereo sound with limited bass. These easy-to-install systems don’t include a subwoofer and are compatible with most standard PC soundcards.
2.1 speaker system
A sound system that shakes some life into your audio. It has two satellites, like a 2.0 system—but adds a subwoofer to give you a more robust sound with deeper bass. It’s just as easy to set up as a 2.0 system, but the subwoofer takes up additional space.
5.1 speaker system
A surround sound system with speakers in front of and behind you to immerse you in your entertainment. It includes left and right front speakers, left and right rear speakers, a front center speaker, and a subwoofer. If you’re into movies or gaming, this is the perfect choice for you.
360-degree sound
Balanced sound no matter where you are in the room. This is create d by using both forward- and backward-firing drivers that project sound evenly in all directions. Also known as omnidirectional acoustics.
6-channel direct
An input with three separate stereo mini-plug jacks (1/8 inch) that connects to PC sound cards, or can be used as three separate stereo inputs for use with headphones, iPods, or other devices with an 1/8-inch jack or plug.
96/24 decoding
An enhanced, higher-resolution, studio-quality format available on many DVD video and DVD audio discs. Refers to 24-bit, 96 kHz audio.
A
AAC (Advanced Audio Coding)
A successor to MP3. It’s an audio codec or device that decodes or encodes digital data. It offers higher sound quality at lower bit rates than MP3. It’s also known as MPEG-4 AAC.
Active driver
The main driver, or electromagnetic component, of a speaker. This is what makes the sound. See driver.
Amplifier (Amp)
A device that increases signal level. They typically increase voltage, current, or both.
Analog signal
A continuous electrical signal that’s commonly represented as an oscillating wave. It can take any value in a range and changes smoothly between values, as opposed to digital signals, which are characterized by discrete bits of information in numerical steps.
Apple Lossless
An audio codec, or device that decodes or encodes digital data, developed by Apple Inc. This is a lossless method of data compression for digital music. See lossless.
B
Bass
The low end of the sound spectrum that goes from 20 Hz to 200 Hz. It puts the boom, shake, and rumble into your entertainment. This is the range for explosions, tubas, cellos, bass, drums, and more. Also known as low range.
C
Center channel
The center speaker in a surround sound system. It goes below or on top of your monitor or TV and produces the dialog and vocals—making them seem like they’re coming right out the screen.
Clipping
A severe form of distortion that occurs when you overload an amplifier. It makes the sound hard and edgy.
D
DAC (Digital to audio converter)
A device that converts a digital bit stream to an analog signal so your speakers can turn it into sound.
dBs (Decibels)
A unit of measure of the relative loudness of sound. The threshold of hearing is 0 dB. A whisper is 15-25 db. A normal speaking voice is 65-70 dB. Live rock music is 120 dB and up. And a jet aircraft is about 140-180 dB. Anything over 140 dB hurts to listen to and can damage your hearing.
Dead zone
An area of the room with quieter sound from your speakers due to sound waves cancelling each other out.
Digital signal
An audio signal that is usually represented by ones and zeros. A digital signal has to be converted to an analog signal before it can be turned into sound.
Digital rights management (DRM)
A technology that allows content owners to determine and control how you can enjoy content. That can include how many copies you can make of a song or what types of devices you can transfer it to.
Distortion
Anything that alters the musical signal from its original quality.
Dolby® digital
A five-channel audio format consisting of left, center, and right front channels, left and right rear channels, and one channel for the subwoofer. It’s one of several systems used for surround sound. All processing is done in digitally for your listening pleasure.
Down-firing subwoofer
A subwoofer that has its cone facing down—directing bass throughout the room.
Driver
This is where the magic happens. It’s an electromagnetic device that turns electrical signals into sound waves in the air by moving a thin layer of fabric or paper. It’s usually made up of a magnet and voice coil.
DTS™
DTS decoders are in virtually every major brand of 5.1-channel surround processor.
E
Equalization (EQ)
The purposeful changing of the frequency response of a circuit to change the sound. You might do this to boost the bass for gaming or movies. Or to create a more balanced sound for your music.
F
FLAC (Free Lossless Audio Codec)
A type of lossless audio compression. It doesn’t remove any information from the audio stream like lossy codecs such as MP3 and AAC. That makes it a good choice for archiving audio collections as well as everyday playback. See Lossless, Lossy.
Frequency
One measure of a sound wave. Unless you’re superhuman, the range for hearing is about 20-20,000 Hz (20 Hz-20 kHz). Lower numbers represent lower frequencies
Frequency Directed Dual Drivers
A Logitech® technology that uses two identical full-range drivers in each satellite. A special filter that detects specific frequencies is applied to one of the drivers—gradually muting specific frequencies in that driver as needed to prevent hot spots or dead zones in the soundfield. The result is better sound quality throughout the entire frequency range of the speaker.
Frequency response
The range of frequencies an audio device can reproduce.
Full-range drivers
A driver designed to reproduce most of the sound spectrum.
H
Hertz (Hz)
The standard unit of frequency, equal to 1 cycle per second. One hertz (Hz) represents one cycle per second, 20Hz represents 20 cycles per second, and so on.
High range (highs)
The high end of the sound spectrum, also known as treble. The high range goes from 4,000 Hz to 20,000 Hz. It covers stuff like bells, cymbals, and the highest notes on a piano.
Hot spots
An area of the room where there volume gets too loud because the sound waves are amplified.
I
Impedance
A measure of electrical resistance specified in ohms.
J
Jitter
A tendency toward poor signal synchronization caused by electrical changes. It can cause doubling up or skipping of portions of audio.
L
Long-throw subwoofer
A subwoofer that gives you higher sound levels at greater distances.
Lossless
A class of data compression that allows the exact original data to be reconstructed from the compressed data.
Lossy
A class of data compression that doesn’t allow the exact original data to be reconstructed from the compressed data.
Low range (lows)
See bass
M
Matched quad micro-drivers
A set of four identical micro-drivers, offering powerful sound in a compact design.
Max-X™ drivers
High-excursion drivers that allow for greater dynamic range, improved bass, and lower distortion.
Midrange (mids)
The middle frequencies of sound from 200 Hz to 4,000 Hz. This is the range of sound our ears are most sensitive to and includes most vocals (not the glass-breaking kind) and instruments.
Midwoofer
A driver that produces mid and some low frequencies.
MP3
A popular digital audio encoding and lossy compression format. It greatly reduces the amount of data (10:1 compression) needed to represent audio. See Lossy.
Muddy
Sound that is poorly defined, sloppy, or vague.
N
Network music player
A device that wirelessly streams the digital music stored on your computer, Internet radio broadcasts, and tracks from online music services to any room of your home. You can choose a player that connects to your stereo or powered speakers, or an all-in-one solution that has its own speakers.
Neodymium micro-drivers
Small drivers made from a rare earth metal that is the strongest permanent magnet on earth.
Noise
Unwanted sound or distortion.
Noise isolation
Preventing outside sounds from entering the ear when you’re listening to music with earphones. It lets you hear your music and not the chatty person behind you.
O
Ogg
A type of file format.
Ohm
A unit of electrical resistance or impedance presented by the speakers and recognized by the amplifier. See Impedance.
Omnidirectional acoustics
See 360-degree sound.
P
Passive crossover
A filter that splits the audio signal into separate bandwidths so each segment can go to the correct type of driver. It keeps the lows from mingling with the highs in your tweeter, for example. This type of filter is made of passive components.
Peak power
The maximum wattage an amplifier can deliver as a brief burst during a musical peak. This is not an accurate measure of power. RMS power, which is standardized, should be used when you compare speakers instead.
Port
An opening in a speaker cabinet that increases the bass response of the speaker.
Ported enclosure or ported subwoofer
A type of speaker enclosure that uses a port to improve efficiency at low frequencies.
Pressure drivers
A driver that create s pressure inside a speaker cabinet that is sealed and airtight to move the passive radiator, increasing sound levels. This is an efficient way to create tighter, lower bass.
R
RMS (root mean square)
A standard amplifier measurement. It’s a conventional way to measure the effective average value of an audio signal or other power (AC) voltage.
RMS power
The amount of continuous power, measured in watts, that an amplifier can produce. The higher the RMS figure, the louder and cleaner music sounds. This measurement is far more accurate than peak power.
S
Satellites
A small speaker with limited bass response.
Shielded
A design that prevents the magnet from causing interference with other electronics.
Signal-to-noise ratio (SNR)
A specification that describes how much noise an audio component has compared to the music signal.
Sound pressure level (SPL)
A measure of the loudness of a sound, relative to the threshold of hearing, measured in dB (decibels). It generally goes from 0 to 140 dB. 140 dB is considered painful and can damage your ears.
Soundstage
The perception of where the different instruments and vocals are located on an imaginary stage.
Stereo
The illusion of a continuous soundfield spread around the listener by two or more related audio signals. It’s often used to indicate that there are two channels.
Stereo XL
A Logitech® technology that widens the soundstage beyond the physical boundaries of the speakers, creating an immersive audio experience.
Subwoofer
A speaker designed to reproduce very low frequencies (20-200 Hz).
Surround sound
Multi-channel audio playback that create s a three-dimensional sound that immerses you in your entertainment. It’s typically used for movies and gaming and makes you feel like you’re part of the action.
T
THX®
A series of specifications for surround sound systems. They’re designed to ensure that the sound of movies is as close as possible to what the filmmakers intended.
Top-fire armature
A custom in-ear speaker design—featured in the Ultimate Ears® SuperFi 5 and 5vi earphones—that uses a compact wideband driver to create a high-performance sound.
Treble
See high range.
Tri-amplification
A design in which each driver (woofer, midrange, and tweeter) has their own amplifier. This generally results in a better sound because the signals can be tailored for the driver more accurately before they get to the amplifier.
Tweeter
A small, lightweight driver for reproducing the highest musical frequencies such as violins and cymbals, and typically everything above 2,000 Hz.
Two-way speaker
A speaker with two different drivers that are dedicated to different frequency ranges.
V
Virtual surround sound
Technology that provides a rich surround sound experience with just two speakers by down-mixing Dolby Digital 5.1 channel and Dolby Surround (Pro Logic) to 2-channel audio.
W
WAV (or WAVE)
A Microsoft and IBM audio file format standard for storing audio on PCs.
Watts
A power measurement derived by multiplying current by voltage. It’s used to quantify an amplifier’s power output.
WMA (Windows Media Audio)
A proprietary compressed audio file format developed by Microsoft.
WMA Lossless
A lossless compressed audio file format developed by Microsoft. See lossless.
Woofer
A driver that reproduces bass frequencies. It can be used in a subwoofer or a two-way or three-way speaker.
Making sound choices about digital sound.
MP3s. Internet radio. Streaming. The days of the CD, let alone the record, are long gone.
But while the digital revolution has made music of all kinds easier to get (and take wherever you go), you’re also confronted with a lot of choices about how to enjoy that music, about making the digital audible.
How can you free that music from your computer and MP3 player? How can you listen to the music on your computer without being tied to it? And how can you make sure you’re getting quality and not just quantity?
We’ll help you sort it all out and make some sound choices.
The music on your computer
Your built-in speakers just don’t do justice to all the music on your computer. Whether you’re looking to listen at your computer or in any room in the house, we’ve got something to please your ears.
Speaking of speakers
Picking the right speakers has a lot to do with what you’re listening to. Are you watching movies and TV? Or are you gaming? Surround sound envelops you in sound and brings your entertainment to life. Just listening to music? A 2.0 or 2.1 speaker system is probably all you need.
Room-size matters
While the number of watts on your system is often the measure by which a system is judged, it’s not always a good indicator. More importantly, you’ll want to find a system that has enough power for the space you’re in. Room size is a good indicator.
Do you want to fill a large family room with floor-thumping audio? You’ll probably want 400 to 500 watts. Are the speakers for a small office? 30 to 70 watts is plenty of power for most people. Or are you just looking for a set of speakers to provide the background music for your day at the office? A 4-watt USB speaker system will have you tapping your fingers.
A world of music, at your fingertips.
From your favorite tracks, to radio from the other side of the planet, never before has such a wide variety of music been so easy to enjoy, thanks to Logitech® Squeezebox™. Browse your digital music collection or tune to thousands of free Internet radio stations. Even discover millions of tracks from online services* like Pandora®, Rhapsody®, SIRIUS®, and Last.fm™.
Using your Wi-Fi broadband connection, add a Squeezebox anywhere you want music—in your kitchen, bedroom, or patio. Walk from room to room while music plays. And control it all simply and intuitively. With Squeezebox, you’re in command. You’re free to explore, discover, and enjoy. Liberating, isn’t it?
The music on your MP3 player
From an upgrade to the ear buds that came with your MP3 player to docks that let you listen out loud, you’ll find better ways to enjoy your music right here.
Better sound on the go
Want to escape with your music and block out more of the outside world? Our MetroFi earphones will be music to your ears. Crave high-fidelity earphones that make you feel like you’re there live? Your audiophile ears will love Ultimate Ears 700 and the Ultimate Ears SuperFi and TripleFi series.
Listen out loud
Ready to let your music loose? We offer a variety of iPod® and MP3 docks to suit your tastes. You can choose a portable speaker for music on the move. Or an alarm clock to wake you up to the sounds you love. We also have docks that work with your iPhone™ without you having to put it in airplane mode.
*Registration/subscription required. Fees may apply. Services subject to change.
System Requirements
-
Works with:
- Computers, music players, TVs, DVD players and other audio sources with 3.5 mm or RCA audio out
- PlayStation®2, PLAYSTATION®3, Xbox 360® or Wii® using the AV cable that comes with your console
Warranty Information
- 2-year limited hardware warranty
Package Contents
- Speakers
- 3.5 mm audio input cable
- Speaker connector cables
- User documentation
Part Number
- PN 980-000402
Technical Specifications
- THX Multimedia Certification
- 200 watts (RMS)
- Two 3.5 mm inputs
- One pair of RCA inputs
- Headphone output
- Controls integrated in the right satellite—Power, Volume, and Bass controls
Verified Owner
