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In 1966, more products were introduced including the YVM-1 "Voice Master", a portable 45 watt tube amplifier combined with a four-channel microphone mixer. The Voice Master contained 1/4-inch phone jacks for PA speakers, a master volume control, treble, mid-range and bass tone controls and patching points for the TR-1, a spring reverb unit made ...
It has a 2-inch QVGA (320 x 240-pixel) display positioned atop a capacitive touchpad. It includes a 30mW headphone amplifier, video connectivity (through an extra cable), a microphone, and an FM radio (to record voice and broadcasts). The device is 40g in weight and is 95 x 43 x 8.9mm (3.74 x 1.69 x 0.35 inches) in size.
The amplifier (an electronic circuit) increases the amplitude of the electric signal using a power source (battery). The speaker converts the amplified electric signal back into a sound wave. The volume (gain) control is used to adjust the amount of amplification applied to the electric signal and thus, indirectly, controls the sound volume.
Microphones used for sound reinforcement are positioned and mounted in many ways, including base-weighted upright stands, podium mounts, tie-clips, instrument mounts, and headset mounts. Microphones on stands are also placed in front of instrument amplifiers to pick up the sound. Headset-mounted and tie-clip-mounted microphones are often used ...
On the listening end, the receiver could hear a low whisper at a thousand feet away. However the apparatus was much too large to be portable, limiting its use. George Prescott wrote: "The principal drawback at present is the large size of the apparatus." Prior to the invention of the electric microphone, early pop singers sang with a megaphone.
A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.