Quartz Direct Drive System: The hallmark of the SP-15 is its highly accurate direct-drive system. The platter is directly coupled to the motor, eliminating the need for belts or idler wheels, which can introduce speed variations and noise. The quartz-locked PLL system ensures extremely precise and stable platter rotation at the selected speed.
Precise Speed Control: The SP-15 typically offers selectable speeds of 33⅓, 45, and 78 RPM, all controlled with quartz accuracy. Fine pitch control is also usually available, allowing for minute adjustments to the playback speed.
High Torque Motor: Designed for professional use, the SP-15 features a high-torque motor that allows for quick start-up times and maintains speed stability even under varying stylus drag.
Rotor-Platter Construction: In some versions, the platter itself forms part of the motor rotor, further contributing to the direct drive's efficiency and stability.
Heavy Platter: The SP-15 typically features a heavy, dynamically balanced platter that helps to maintain consistent speed and reduce wow and flutter.
Robust Construction: Built for demanding professional environments, the SP-15 boasts a robust and well-damped chassis to minimize external vibrations and acoustic feedback.
Versatile Tonearm Mounting: The SP-15 is usually sold without a tonearm, allowing users to choose and mount a tonearm that suits their specific needs and preferences. It typically features a standard SME-type mounting collar, accommodating a wide variety of tonearms.
External Control Unit (Optional): Some configurations might include an external control unit for speed selection, pitch control, and start/stop functions, offering remote operation and precise adjustments.
Professional Connectors: The SP-15 often features professional-grade audio output connectors.
Potential Specifications (Note: Specifications can vary slightly depending on the specific version or market):
Type: Direct Drive Turntable
Motor: Quartz-Locked Direct Drive
Speeds: 33⅓, 45, 78 RPM
Pitch Control: Typically ±6% or more
Wow and Flutter: Extremely low, typically less than 0.025% WRMS
Rumble: Very low, typically better than -70 dB (DIN B)
Platter Material: Typically non-magnetic aluminum alloy
Platter Weight: Often around 2-3 kg
Starting Torque: High, allowing for quick start-up (e.g., 1.5 kg-cm)
Power Consumption: Varies depending on the model
Dimensions: Typically a standard size for professional turntables (e.g., around 460 x 155 x 370 mm)
Weight: Substantial, often around 10-15 kg (without tonearm)
