pickup arm การใช้

Some pickup arms incorporate viscous damping aimed at eliminating such resonance.
An important factor affecting rumble is low-frequency resonance resulting from pickup arm mass bouncing against stylus compliance.
When playback has been started, the player spins the disc up to speed while moving the pickup arm over the disc surface and lowering the stylus onto the beginning of the disc.
A different format, CD-4 ( not to be confused with compact disc ), by RCA, encoded the front-rear difference information on an ultrasonic carrier, which required a special wideband cartridge to capture it on carefully calibrated pickup arm / turntable combinations.