Ortofon SPU Classic GM MkII  The SPU Classic GM MkII, known for its dynamic and powerful sound reproduction, is a Moving Coil cartridge with an 18 µm spherical stylus profile.  The SPU Classic series embodies the essence of the original Moving Coils and are a perfect solution for the playback of both early and modern and contemporary stereo recordings.  Techical data   Output voltage at 1000 Hz, 5cm/sec. 0.2 mV Channel balance at 1 kHz < 1 dB Channel separation at 1 kHz >20 dB Channel separation at 15 kHz >10 dB Frequency range at - 3dB 20-25.000 Hz Frequency response 20-20.000 Hz ± 3 dB Tracking ability at 315Hz at recommended tracking force *) >65 µm Compliance, dynamic, lateral 8 µm/mN Stylus type Nude spherical Stylus tip radius R 18 µm Tracking force range 3.0-5.0 g (30-50 mN) Tracking force, recommended 4.0 g (40 mN) Tracking angle 20° Internal impedance, DC resistance 6 Ohm Recommended load impedance >10 Ohm Cartridge body material  Grinded wood Coilwire material High Purity Copper (OFC) Cartridge colour Nickel/Black Cartridge weight 32 g