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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 CD391 cassette deck


 Harman Kardon's state-ot-the mind technology is exemplified in the CD391. its frequency response is an almost unheard of 20 Hz to 22 kHz (±3 dB), with any tape formulation.

The CD391 also offers the advantages of Dolby HX Professional, which delivers greatly enhanced frequency response at high record levels, with significantly reduced distortion. Added to this is a Signal-to-Noise Ratio with Dolby HX Pro, the CD391 provides a high level (0 dB) Frequency Response of 20 Hz to 20 kHz (±3 dB). The dramatic result of this is the ability to accurately record more dynamic audio signals than was previously possible. This is especially significant as more demanding forms of software, such as digital audio emerge.

To indicate the optimum record level, the CD391 has a unique mater weighting feature which measures the frequency content of the music and is backed by a 16-segment peak level meter ranging from -30 dB to +10 dB.


The CD391 also offers a highly precise closed-loop, dual capstan, dual flywheel transport and a third motor to gently raise and lower the head assembly. It also has bi-directional auto-search: peak hold, independent left and right level controls; and master fader.

Special Harman Kardon features found on the CD391 also include tone generators for bias trim and record calibration that allow alignment of bias and Dolby levels with virtually any tape. Sendust record/playback head, Mic/Line mixing, solenoid operation, timer controllable functioning, record, mute and auto space are all featured on the CD391

 


Specifications

Tape Speed:  1-7/8 (ips)

Heads: 2

Record/Playback Head Type:  Sendust

Frequency Response (-20 dB, IHF std)

All Tape Formulations:  20 Hz - 22 kHz ±3 dB

Metal Tape :  20 Hz - 22 kHz ±3 dB

Large Signal Response (0 dB, with Dolby On, Metal Tape):  20 Hz - 20 kzh ±3 dB

Wow and Flutter

NAB, WRMS :  0,025%

DIN :  0,04%

Signal-to-Noise Ratio (CrO₂)

Dolby NR, Off :  58 dB

Dolby B, On :  66 dB

Dolby C, On :  74 dB

Total Harmonic Distortion (1 kHz, Metal tape, Dolby Level):  0,9%

Channel Separation:  45 dB

Channel Crosstalk:  70 dB

Erase Ratio:  65 dB

Bias Frequency:  106 kHz

Fast Forward and Rewind Time:  90 sec. C-60 cassette

Peak Reading meter Range:  -30 dB to +10 dB

Output Level, ) dB, 10 k Ω  load:  420 Mv (max)

Output Impedance:  <5  k Ω

Input Sensitivity (0 dB)

Mic :  0,65 mV

Line :  40 mV

Input Impedance

Mic :  1,0 k Ω

Line :  22 k Ω

Headphone Impedance (Minimum):  8 Ω

Dimensions (W x H x D):440 x 122 x 343 mm (17-5/16" x 4-13/16" x 13-1/2")

Weight:  8,0 kg (17,6 lbs)

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