HK 640

Continuous Average Power (FTC) per Channel (stereo mode)

8 ohms... 55 watts @ <0.09% THD

Continuous Average Power (FTC) per Channel (stereo mode)

4 ohms... 75 watts @ <0.3% THD

Dynamic Power

8 ohms... 75 watts (IHF, 1kHz tone burst)

Dynamic Power

4 ohms... 120 watts (IHF, 1kHz tone burst)

Dynamic Power

2 ohms... 160 watts (IHF, 1kHz tone burst)

High Instantaneous Current Capability (HCC)

± 45 Amps

Power Bandwidth

HALF POWER – <10Hz – 100kHz @ 8 ohms

Frequency Response

0.5Hz – 100kHz (+0/-3dB @ 1 watt)

Damping Factor

120

Signal-to-Noise Ratio

TUNER & CD – 99dB (ref rated power output, A-Wtd)

Input Level/Impedance

TUNER & CD – 135mV/22k ohms

Tone Controls

BASS – ±10dB @ 50Hz

Tone Controls

TREBLE – ±10dB @ 10kHz

Power Supply

AC 230V, 50/60Hz

Power Consumption

230 watts

Signal-to-Noise Ratio

OPTIONAL PHONO MM – 80dB (ref rated power output, A-Wtd)

Signal-to-Noise Ratio

OPTIONAL PHONO MC – 75dB (ref rated power output, A-Wtd)

Input Level/Impedance

OPTIONAL PHONO MM -2.2mV/47k ohms, 125pf

Input Level/Impedance

OPTIONAL PHONO MC – 120uV/56ohms

Phono Overload

OPTIONAL PHONO MM – 100mV

Phono Overload

OPTIONAL PHONO MC – 5mV