E90
| Manufacturer | Koss |
| Function | Amplifier, Headphone |
| Country | United States of America |
| Form Factor | Desktop |
| Signal Path | Analog Hardware |
| Dimensions | 65mm h x 110mm w x 155mm d |
| Weight | 482gm |
| Frequency Response | 1.6-50,000Hz (-3dB Points) - 100vrms Differential Output |
| Distortion (THD+Noise) | 0.001% (1kHz - 100Vrms Differential Output) |
| Input Impedance | 100k Ohms |
| Gain | 60dB |
| Audio Output Voltage | 2300Vrms (Push-Pull w/ Soft Limiting) |
| Channel Separation | -80dB (1kHz - 100Vrms Differential Output) |
| S/N | -100dB (100Vrms Differential Output) |
| Bias Voltage Supply | 600VDC |
| Signal Polarity | Absolute Phase (non-inverting) |
| Controls |
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