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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 hk670 receiver

 

Twin Powered DC coupled Ultrawideband AM/FM Stereo Receiver

 

Harman kardon engineering has one goal; to reproduce music in the home with uncompromising accuracy. Modern recordings rival the tonal balance, clarity and detail of the concert hall. A superior component must reproduce these characteristics faithfully.

It must deliver all the music.

The hk670 receiver is one of a new series from Harman Kardon designed, built, and tested with new understandings that go far beyond conventional ideas about distortion and the factors that make one component sound better than others. They are the most musically accurate receivers ever devised.

Features:

60 watts per channel

Ultrawideband design

Excellent pahse linearity

Superb transient response

Twin powered

Electronic circuit protection

DC coupled, low feedback power amplifier

Subsonic and high cut fiters

Tone control bypass

2-way tape duplication

Sensitive, selective FM section and new, low-noise FM section

SMQ tuning meter

LED FM in-tune indicator

Switchable interchannel noise suppression

Parallax-free tuning dial

Speaker selector switches

Soft-touch switches and controls

 


Specifications

Power Output: 

60 watts (min. RMS per channel , both channels driven into 8 Ω  from 20 Hz - 20 kHz at less than 0,06% T.H.D.)

75 watts (DIN 45 500) at 8 Ω

Power Bandwidth:  8 Hz to 100 kHz at less than 0,08% T.H.D. into 8 Ω , both channels driven simultaneously, at 30 watts rms per channel

Total Harmonic Distortion 0,03% (1 kHz at rated output)

Intermodulation Distrotion:  0,05% at rated output

Frequency Response:  below 3 Hz to 140 kHz -3,0 dB

Damping Facyor:  better than 30 at 8 Ω

Hum and Noise

Phono :  -90 dB A Weighted IHF

Aux :  -102 dB A Weighted IHF

Residual :  -102 dB A Weighted IHF

Slew Rate :  65 V/µsec

Square Wave Rise Time:  2,5 µsec at 20 kHz

Square Wave Tilt:  less than 2% at 20 Hz

Overall Negative fFeedback:  28 dB

Phono Sensitivity:  2,2 mV

Phono Overload:  better than 225 mV

Phono Equalization:  ±0,5 dB

Phono Input Impedance:  47 k Ω

High Level Sensitivity:  130 mV

Usable FM Sensitivity [mono]:  1,9 µV

50 dB Quieting:  3,0 µV [mono], 30 µV [stereo]

FM Noise:  -75 dB

Captire Ratio:  1,2 dB

Alternate Channel Selectivity:  -75 dB

Image Rejection:  - 80 dB

IF Rejection:  -110 dB

AM Rejection:  -62 dB

Stereo Separation:  55 dB at 1 kHz

FM Distortion

Mono :  0,05% at 1 kHz, 100% modulation

Stereo :  0,08% at 1 kHz 100% modulation

FM Frequency Response:  20 Hz to 15 kHz ±0,5 dB

AM Sensitivity:  300 µV/meter

AM Selectivity:  - 40 dB

Aalternate Channel Selectivity:  35 dB

Image Rejection:  -50 dB at 1 kHz

IF Rejection:  -45 dB at 1 kHz

Dimensions (W x H x D):  476 x 159 x 360 mm (18-1/2" x 6-1/4" x 14")

Weight:  12 kg (26 lbs)


 

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