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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Harman/Kardon hk490i receiver


High Technology Receiver hk490i, features

High Instantaneous Current Capability (HCC)

Low Negative Feedback

Ultrawideband Response

Exceptional FM Audio Sound Quality

Digital Synthesized Quartz-locked Tuning

 

The hk490i, with its high instantaneous current capability of 18 amps, will develop far more power under peak loads than its rated 30 watts per channel. In fact, the dynamic behavior approaches the ideal, in that the transient power nearly doubles into 4 Ω  and nearly quadruples into 2 ohms. That means the hk490i gives you louder, clearer, cleaner sound than any other 30 watt receiver.

With its ultrawideband frequency response of 0,2 to 150 kHz, the hk490i delivers very fast transient response, while virtually eliminating TIM distortion. The tuner section shuts down when the phono or aux buttons are pressed to eliminate digital switching noise or the possibility of bleed-through. There are also two tape monitors with copying ability and a subsonic filter.

The digitally synthesized quartz-locked tuner provides precise, drift-free reception. The display is DC driven,, to eliminate switching noise and distortion, and an auto FM switch automatically shifts the tuner into mono when the signal is too weak for stereo reception.

For convenience, stations may be locked into one of the 8 AM and * FM memory presets. In addition, the auto-mode switch scans up or down to the next station automatically.

By the way, since our equipment has always been designed to play original master tapes, we've been ready for digital audio and coming software advances - long before they've been ready for us.

 


Specifications

Audio Section

Power Output rms (both channel driven into 8 Ω , 20-20,000 Hz):  30 watts per channel (at less than 0,08% T.H.D.)

High Instantaneous Current Capability (HCC):  18 A

Power Bandwidth (at half rated output into 8 Ω ):  less than 10 Hz - 100,000 Hz

Frequency Response:  0,2 Hz - 150,000 Hz (+0 -3 dB)

Slew Rate:  120 V/µsec

Square Wave Rise Time (at 20 kHz):  1,8 µsec

Square Wave Tilt (at 20 Hz):  5%

Signal-to-Noise Ratio IHF A weighted

Phono :  80 dB

Aux, DAD :  83 dB

Input Sensitivity/Impedance

Phono :  2,2 mV / 47 k Ω  and 125 pF

Aux, DAD :  135 V / 22 k Ω

Tone Control Characteristics

Bass (Boost/Cut) :  10 dB / -10 dB at 50 Hz

Treble (Boost/Cut) :  10 dB / -10 dB at 10 kHz

Loudness Control:  +10 dB at 50 Hz / -10 dB at 10 kHz

Filters

Subsonic :  15 Hz, 8 dB/octave

High Cut :  6 kHz, 6 dB/octave

Tuner Section

Usable FM Sensitivity (Mono):  10,8 dBf (0,95 µV /75 Ω )

50 dB Quieting Sensitivity

Mono :  15,6 dBf (1,65 µV / 75 Ω )

Stereo :  36,6 dBf (18,5 µV / 75 Ω )

Alternate Channel Selectivity70 db

Stereo Separation (1 kHz)50 db

FM Total Harmonic Distortion (1 kHz, 100% modulation)

Mono :  0,08%

Stereo :  0,12%

AM Sensitivity:  15 µV (external antenna)

General

Power Requirements:  AC 120 V, 60 Hz

Power Consumption:  100 W

Dimensions (W x H x D):  443 x 134 x 365 mm (17-7/16" x 5-1/4" x 14-3/8")

Weight:  8 kg (17 lbs 10 oz)

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