ESP phones info listDoes anybody know what the ESP10's bias voltage is?
Lets make a list of all the ESP's bia voltage:
ESP6: 360v (should be the same as the ESP7 )
ESP7: 360v (confirmed by zener voltage measurement )
ESP9: 720v (info)
ESP950: 600v (Koss manual)
Some ESP950 info (from Koss manual):
*Diaphragm: Ultra-low mass 1.5 micron C grade polyester film electronbeam coated with a proprietary semiconductive material 250 A thick.
*Acoustic Design principal: Circumaural open air design incorporating minimal acoustic damping.
*Diaphragm radiating surface area: 7 sq. in. (45.6 sq. cm)
E90 (amp for ESP950) info:
*Frequency response: 1.6 Hz to 50,000Hz (-3dB points) 100 vrms differential output.
*Input Impedence: 100k ohms
*Input level: 1 Vrms (for full power output)--- (then why did a SDS headamp connected to the input help the sound?)
*Voltage Amplification: 60 dB
*Audio output voltage: 600 Vrms differential, 2300 Vrms push-pull with soft limiting --- (wow, 2300V?? )
*Channel Separation: - 80 dB at 1 kHz, 100 Vrms differential output
*Signal to Noise: -100 dB at100 Vrms output
*Power consumption: 320 mA DC current at normal listening levels.