Introducing the Turntable Light Speed Control (LSC)
Conventional Speed Control problems
To explain why the LSC is of such benefit we first need to understand the problems it solves. Speed accuracy on most turntables tends to drift. Encoder motor control is sometimes hailed as the solution but has problems. However accurate their speed, they never get over most of the following issues.
- Belt wear causes belt slippage so even if the motor is turning at the correct speed the belt does not keep up as it did once. Regular speed resets are required.
- Temperature variation causes belts to stretch or shrink slightly which affects belt tension > slippage > speed.
- As motors age they tend to run slower (not true of encoder types).
- Oil viscosity varies with temperature so bearing drag can cause changes to belt slippage.
- Pod position affects speed as it changes belt tension.
- Belt grip varies with the 4 different ways it can be put on the deck
These are some reasons most decks achieve an absolute speed accuracy of around 0.2% to 0.6%. In fairness this is not bad although professional musicians sensitive to pitch will notice it. It’s also worth mentioning that absolute speed accuracy is nowhere near as important as motor vibration (micro jitter caused by cogging and electrical aberations).
The solution for Perfect Speed Control
One way to overcome speed drift is to measure and control the speed of the platter itself. This is usually the preserve of direct drive decks which are renowned for their consistent speed. However the Origin Live LSC does precisely the same thing with unerring accuracy achieving a measurable drift of below 0.0001% (over 100 times more accurate than most decks).
The high degree of accuracy derives from a very high quality motor with superb low noise circuit design. This includes instanteneous load compenstion whilst absolute speed stability is achieved through super accurate measurement of actual platter speed (LSC).
The system is such that it guarantees this level of accuracy regardless of belt wear, motor age, pod position and temperature. This makes for an extremely user friendly experience as you do not have to worry about the aforementioned factors that bedevil conventional decks.
The most significant advantage of the LSC is that it achieves a significant reduction in motor jiter. This is not wow and flutter but tiny micro changes in motor speed that create vibration - not something that is ever measured due to technical challenges but is by far the most significant factor affecting sound quality. Encoders create this problem in spades which is why we never use them.