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Use of mobile phone apps to check and adjust the speed
Rega, along with a London mastering studio, have used the iPhone 'RPM' app (available on the App Store) developed by Philip Broder to check and
adjust the speed of a turntable using the Neo PSU MK2, with positive results. We have verified the basic accuracy of the 'RPM' app using Rega's
in-house speed measuring equipment, but as this is a third-party app we cannot guarantee the readings because of uncertainties, which could be
caused by the age, condition, and operating system of the phone the app is installed on. If you are in any doubt, you should check the calibration of
the 'RPM' app using a suitable reference.
Rega Strobe and stroboscopic disc (sold separately)
The best way to adjust the speed of your turntable is to use the Rega Strobe kit. A stroboscopic disc is an optical instrument used to measure the
speed of the turntable by freezing the bars on the disc. The bars are illuminated by an accurate quartz locked LED pulsing at 100Hz.
Using the Strobe kit
Simply place the strobe disc on the turntable platter. Switch on the 100Hz LED and hold it approximately 2cm above the rotating strobe. If the bars
do not appear to move and are stationary, the speed is 331/3 rpm. If they move clockwise, the turntable is running fast, and conversely, if they move
anti-clockwise, the turntable is running slow.
Note: If over one minute, the bars appear to move by one bar to the left or one bar to the right, the speed is 0.016% fast or slow respectively. Using
the speed control on the Neo PSU MK2, it is possible to achieve ±0.05% or ±1.3 rpm.
Note: If over one minute, the bars appear to move by two bars to the left or by two bars to the right, the speed is 0.01 rpm fast or slow respectively.
Using the speed control on the Neo PSU MK2, it is possible to achieve ±0.01 rpm, which is one step of the speed adjustment.
Warning: Because of the nature of the stroboscopic effect of the disc and the LED light, we strongly recommend anyone with photo-induced epilepsy
not to use this device. Although this condition is very rare, we must make the user aware of this. Ask your dealer for assistance if required.
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