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Bass
Low audio frequencies

Bass Reflex
See Ported

Coaxial
Speakers with separate cones within the same unit which give better sound quality than full range speakers

Components
Separate speakers with a crossover that are generally regarded to give the best sound quality as they can improve the Staging

Cone
The sound-making part of a loudspeaker that moves back and forth in the air

Driver
Another word for a speaker

Dual cone
Speakers with two cones, usually one glued to the other

Enclosure
An enclosure designed to improve the performance of a loudspeaker - also known as a box

Free-Air
A type of subwoofer which works best in free air, using the boot as an enclosure

Full Range
Single cone speakers that produce the full range of frequencies

High Pass Filter
Filter that removes the lower frequencies from the signal and is often used with a tweeter. Also known as a capacitor or bass blocker.

Low Pass Filter
Filter that removes the higher frequencies from the signal and is often used with a subwoofer

Midrange
As the name suggests, frequencies in the middle of the frequency range

3-way
A speaker system made up of three different types of drivers

Tweeters
Speakers that reproduce the higher frequencies (treble), they are generally fairly small

2-way
A speaker system with two types of drivers (see also COAXIAL)

Sub Bass
The 'thumping rumble' in a system

Subwoofers
Large speakers designed to produce the low frequencies, designed to be used in a cabinet, tube or free-air application

Voicecoil
A small coil of wire positioned close to a magnetic field in the speaker. When electrical current is fed into the voicecoil, the coil will move back and forth. When the cone of a speaker is fastened to the voice coil, the cone will move.