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Early public-address system from around 1920 using a Magnavox speaker. The microphone had a metal reflector that concentrated the sound waves, allowing the speaker to stand back so it would not obscure his or her face. The early vacuum tubes could not produce much gain, and even with six tubes the amplifier had low power.
MIPRO was established in 1995 by founder K.C. Chang, who had in 1970 designed the first FM wireless microphone in Taiwan and obtained the first patent for a condenser microphone capsule in Taiwan. In 2001 MIPRO introduced a technology they termed ACT (Automatic Channel Targeting). "ACT" synchronizes the receiver and transmitter frequencies.
Korg Pa588 – During year 2008, Korg introduced Pa588, a cross-over of an arranger (the acclaimed Pa500) and a digital stage piano, with the 88-note graded-weighted RH3 keyboard, built-in speakers, and a piano sample. It came with piano stand included, and featured Pa-Series compatibility. Korg MR-2000s – High resolution recorder.
By the 1970s and 1980s, though, portable PA systems were typically sold as three-piece sets: an amp-mixer containing a small mixer (with four to six channels) and a power amplifier integrated into a single amp head-style chassis with a handle, and two separate PA speakers. The speakers were typically connected to the amp-mixer with speaker cables.
Since a conventional speaker is similar in construction to a dynamic microphone (with a diaphragm, coil and magnet), speakers can actually work "in reverse" as microphones. Reciprocity applies, so the resulting microphone has the same impairments as a single-driver loudspeaker: limited low- and high-end frequency response, poorly controlled ...
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 ...