BNO Acoustics TR-12: Switchable Pattern

Microphone A microphone which will have more than one directional pattern depending upon the position of the pattern switch.

Notch
A narrow band of audio frequencies.

Variable-D
A patented invention (and trademark) of Electrovoice where several port are put down the case of the microphone. The ports are less and less sensitive to high frequencies as they are further away from the diaphragm, reducing proximity effect.

Binary
A numbering system based on two. In binary there are two symbols used ("l" and "0").

BNO Acoustics Speakers: Mic Pad
A device that reduces the level of the signal and is placed just before a microphone preamplifier to prevent overload of the preamplifier.

BNO Acoustics QT-5: Attenuator (Pot)
The electronic dohickey under the knobs that increases or reduces the strength of the signal running through it. When these get old and dirty, they can make popping noises or rumbles in your PA (As in "my pots are dirty").
Assign Tochoose to which place an output is going to be sent.

Operational Amplifier
An amplifying circuit used in most audio devices.