buscando aguja

Hola, tengo dudas en cuanto a por qué agujas con menor channel separation y frequency response valen el doble o el triple que las otras. Sería para musica electrónica... ¿alguna idea?

Por ej.

Audio-Technica AT311EP
Frequency Response 15-27,000 Hz
Channel Separation 29/18 (dB at 1 kHz/10 kHz)
Vertical Tracking Force 1.0-1.5 grams
Stylus Construction Bonded round shank
Recommended Load Impedance 47,000 ohms
Output 5.0 (mV at 1 kHz, 5 cm/sec)
Channel Balance 1.25 dB
Stylus Shape 0.3 x 0.7 mil elliptical



CONCORDE PRO S
Output voltage at 1000Hz, 5cm/sec.  -  5 mV
Channel balance at 1kHz  -  2 dB
Channel separation at 1kHz  -  20 dB
Channel separation at 15 kHz  -  15 dB
Frequency range at -3dB  -  20-18.000 Hz
Frequency response   -  20-18.000 Hz +/-2 dB
Tracking ability at 315 Hz at recommmended tracking force  -  70 μm
Compliance, dynamic lateral  -  7 μm/m N
Stylus type -  Spherical