The hk690i - it's the ultimate receiver from Harman/Kardon.
The hk690i provides the combination of pure power, sonic excellence and features that the true audiophile demands.
With its High instantaneous Current Capability of 45 amps, the hk690i will develop far more power under peak demand conditions than its rated 60 Watts per channel. In fact, its dynamic behavior approaches the ideal; the transient power nearly doubles into 4 ohms and continues to increase dramatically into 2 ohms. This means that the hk690i gives you louder, clearer sound than any other 60 Watt receiver.
It has an Ultrawideband Frequency Response of 0,2 Hz to 150 kHz, as well as low negative feedback for extremely fast and accurate transient response. The result is a virtual elimination of TIM distortion.
The phono section has a unique RIAA equalization circuitry which maintains a constant low level of negative feedback throughout the audio frequency range. The tuner section automatically shuts off when the phono or aux buttons pressed to eliminate digital switching noise or the possibility of bleed-through.
The digital synthesized quartz-locked hk690i possesses a unique sample-and-hold MPX decoder to decrease high frequency switching noise while eliminating the need for much of the filtering normally required in FM processing.
Features normally expected to be found in top-of-the-line components are, naturally, included. Provisions for two tape decks (with tape copy capability) auto and manual tuning, 8 Am and 8 FM memory presets, switchable bass and treble turnover frequencies, a Moving Coil head amplifier, loudness control, subsonic and high cut filters, muting control and FM high blend.
Specifications
Amplifier Section
Power Output
RMS, per channel, (both channels driven into 8 Ω , 20-20,000 Hz): 60 Watts less than 0,06% T.H.D.
IHF Signal (Dynamic Power) at 4 Ω , 1 kHz : 120 watts
IHF Signa (Dynamic Power) at 2 Ω , 1 kHz : 150 watts
Negative Feedback (Overall): 12 dB
High Instantaneous Current Capability (HCC): 45 Amps
Power Bandwidth (at half-rated Output, 8 Ω ): less than 10 Hz - 100 kHz
Frequency Response (at 1 Watt Output, +0 -3 dB): 0,2 Hz - 150 kHz
TIM: Immeasurable
Slew Rate: 200 V/µsec
Square Wave Rise Time: 1,8 µsec
Square Wave Tilt, at 20 Hz : less than 5%
Signal-to-Noise Ratio (IHF A Weighted, ref. 1 Watt output (New IHF)
Phono MC : 78 dB; 500 µV input
Phono MM : 80 dB; 5 mV input
Aux : 80 dB; 0,5 V input
Input Sensitivity/Impedance
Phono MC : 120 µV /47 k Ω
Phono MM : 2,2 mV/47 k Ω , 125 pF
Aux : 135 mV/22 k Ω
Overload at 1 kHz : 200 mV/Infinite
RIAA Equalization (20 Hz - 20 kHz): ±3 dB
Tone Controls
Bass : ±10 dB at 50 Hz
Treble : ±10 dB at 100 kHz
Subsonic Filter: 15 Hz, 12 dB/oct
Tuner Section
Usable FM Sensitivity (dBf/µV - 75 Ω)
Mono: 10,8 dBf / 0,95 µV
50 dB Quieting Sensitivity (dBf/µV - 75 Ω)
Stereo: 14,6 dBf / 1,65 µV
FM Signal-to-Noise Ratio
Stereo: 76 dB
Capture Ratio: 1,0 dB
Alternate Channel Selectivity: 70 dB
iF Rejection: 110 dB
AM Rejection (45 dBf): 60 dB
Stereo Separation (1 kHz, 65 dBf, 100% mod.): 55 dB
FM T.H.D. (1 kHz, 100% mod.)
Mono : 0,06%
Stereo : 0,08%
Am Sensitivity: 15 µV (ext. Ant.)
AM Alternate Channel Selectivity: 45 dB
AM Image Rejection: 33 dB
AM IF Rejection: 60 dB
Dimensions (W x H x D): 440 x 134 x 368 mm (17-3/8" x 5-1/8" x 14-1/2")
Weight: 10 kg (21 lbs 19 oz)