March 01, 2021
There’s obviously no more important piece of audio equipment than the speaker – the way we actually hear recordings or the amplified signal from microphones on stage. But unless you make speakers for a living, you may not have much cause to open one up and study the insides – even though it might be nice to understand a bit about them.
There are many different kinds of speakers; PA speakers, studio monitors, theater speakers, stage monitors, active speakers (with an amp built-in), car speakers, headphones, and so on; but they all share a basic design, so here’s a simple introduction to the anatomy of a speaker.
Loudspeakers come in two basic flavors: one speaker per cabinet – as in Carvin Audio’s QX5A 3-Channel Near Field Monitor - or multiple speakers in one cabinet, such as Carvin Audio’s SCX12A 1000 Watt Active Stage Monitor/Main. These “speakers within a speaker” are referred to as drivers.
Multiple-speaker cabinet arrangements will either be two-way or three-way. In a two-way system, low frequencies are handled by one or more large drivers called woofers, and high frequencies are handled by one or more smaller drivers called tweeters. In a three-way system, a third driver (or set of drivers) handles mid-range frequencies and is either referred to as a mid-range driver or a squawker. Rarely, speaker systems include another driver called a super tweeter, which produces very high frequencies – sometimes even out of the range of human hearing.
In two-way and three-way speaker systems, a crossover is used to split the signal into low and high frequencies (low, mid, and high for three-ways), sending low frequency information only to the woofer and high frequency information only to the tweeter.
Theater speakers, most home stereo speakers, studio monitors, and many kinds of PA speakers are two or three-way speaker systems, whereas guitar cabinets are generally a one-way system because they use one driver (or several of the same kind) which reproduces a frequency spectrum that is desired for the instrument.
A subwoofer is a special speaker designed to reproduce only low frequency sound.
Several parts make up the design of any speaker driver:
The cone is the lightweight part of the speaker that moves, creating sound waves.
The voice coil is attached to the cone and receives an electrical signal representing an audio waveform. This electric current creates a magnetic field which in turn turns the coil into a variable electromagnet. This mechanism is alternately charged positively and negatively, which attracts or repels it from a fixed magnet. The voice coil moves, and since it’s attached to the cone, the cone moves as well, displacing air and creating a sound wave.
The magnet creates a fixed magnetic field, which is what allows the changing polarity in the voice coil to create physical motion.
These are conductive parts which concentrate magnetic energy on the voice coil.
The spider is a fibrous material and surround is a flexible ring. Together they form a suspension system that allows the cone and voice coil to physically move forward and backward, but not side to side.
These wires deliver electrical signal (audio) to the voice coil.
The dust cap (a round nub, visible in the center of the cone from outside the assembly) prevents debris, dust, and especially metal pieces from entering the gap between pole and magnet and interfering with the voice coil.
The basket simply holds everything together and attaches it to the cabinet.
The cabinet is the box the loudspeaker is in. The size and ports (openings) or lack thereof determine to a large extent the overall performance of the speaker system.
That is speaker anatomy in a nutshell. There are many variations, but all speakers have this basic design in common.
July 14, 2021
It’s a common misconception that a singing voice is some sort of set-in-stone trait, like hair color or height. “You have a great voice” is the compliment you’ll hear, rather than “you have great vocal skill”. It’s true that certain genetic traits make voices unique, but using a voice is a skill just like any other instrument.
July 08, 2021
If you’ve spent any significant amount of time on stage, you’ve become accustomed to tripping over cables. Most stages are strewn with various cables, and backstage can be an epic rat’s nest.
Vocalists who stand at the mic and croon may not mind – after all, they’re not moving around. Singers who like to use the whole stage, though, tend to tangle up. Some singers even love to get into the audience and venture all around the room – not really possible with a wired mic.
So, is it time for you to go wireless?
June 16, 2021
It’s always exciting when a song is ready for final mixdown, and most of us want to rush in and get going. But it turns out a little judicious preparation and organization can make mixing faster, easier, more enjoyable, and most of all more effective. After all a cluttered, crazy, mix can be a nightmare.
So, here are a few tips for getting your mix organized right from the start, so you can get your best, most efficient results.
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"Make a joyful noise unto the Lord all of the earth; make a loud noise and rejoice and sing praises. Sing to the Lord with the harp and the voice of the psalm." - Psalm 98:4-5