Clearaudio Maestro v2 High-Output Ebony-Body Phono Cartridge with Boron Cantilever The Clearaudio V2 moving magnet cartridges are meticulously measured, analysed, and hand-selected into four performance levels. In this way Clearaudio achieves the best stereo channel matching, minimum phase error and distortion, flattest frequency response and highest dynamic range at each price point. The cartridges produce an audiophile sound of superlative quality  spatially detailed and vividly textured, with bass that does not wallow and treble that is not harsh. The models of the Clearaudio MM V2 series provide outstanding sound quality on all current tonearms. All the cartridges in this series are made with housings of hand-polished ebony  the key to record-breaking weight values. FREQUENCY RESPONSE 20 Hz - 20 kHz OUTPUT VOLTAGE (1 kHz, 5 cm/s):  3.6 mV CHANNEL SEPARATION 1 kHz): &gt; 30 dB CHANNEL BALANCE (1 kHz):  0.2 dB TRACKING ABILITY 90 m REC. TRACKING FORCE (recommended: 1.8  2.6 g): 2.2 g  0.3 g COIL IMPEDANCE (1 kHz): 0.66 kOhm COIL INDUCTANCE 0.42 H LOAD RESISTANCE 47 kOhm LOAD CAPACITANCE 100 pF CANTILEVER Boron / HD Diamond TOTAL WEIGHT 8.4 gram