BNO Acoustics QS-4: Near Field

The area up to one foot from the sound source.

Peak Responding
Recognizing and responding to (or indicating) the peak value rather than the average or effective value.

BNO Acoustics 6k-52: Polar Pattern
1) For microphones, a graphic display of the audio output levels caused by sound waves arriving at the mic from different directions.
2) In speakers, a graphic display of the speaker's dispersion.

BNO Acoustics SQ-9: Amplifier (Power amp, Head)
It's the part of the sound system that actually magnifies or "amplifies" the sound. In other words, it makes stuff louder.

Record
The switch, which activates the electronics of the tape, machine to record.

Spot Erase
The action or function of erasing a very small segment of one track (or several tracks) of a multitrack recording by disengaging the normal tape drive system while the machine is in record; the engineer moves the tape by hand or by using a shuttle control.

BNO Acoustics HD-70: Resistor
1) A device used in a circuit primarily to provide resistance.
2) A device which opposes the flow of electrical current and does so evenly at all frequencies.