Kurzweil KME61 - REV A User Manual page 62

Reference
Audio Specifications
Left and Right Analog Audio Outputs
Connectors
Impedance
Maximum output level +15dBu (4.4 Volts RMS) high impedance load
Frequency response
Harmonic distortion
Idle channel noise
Dynamic range
Headphone Output
Output Impedance
Maximum output level
8-18
Unbalanced outputs using two 1/4-inch phone plugs
1000 ohms left & right (stereo)
500 ohms left/mono
20Hz - 20KHz +/- 1.0dB
Less than 0.005% @ 1KHz, full-scale
Less than -125dBA relative to full-scale signal
Greater than 120dBA using -40 dBFS signal
47 ohms, nominal
0.9 Volts RMS into 32 ohms (25 mW)