Kenwood KF-8011

 Kenwood Solid State Audio Denoiser  KF-8011 does not belong to the conventinal noise filter which excludes necessary signals together with noises. It functions as the S/N Stretcher or Noise Reduction System used in the process of disc production, and electronically eliminates the noises included in the sources.  Thanks to its exclusive circuitry, KF-8011 remarkably increases the signal to noise ratio and fully refreshes the program sources. It's especially profitable for tape dubbing.

 Special features

Minute Denoising

The KF-8011 decreases the noises between 3 kHz and 15 kHz, which affects most badly on the sound performance, by 6 - 10 dB. The built-in Frequency Selector enables to pick up the particular frequency range in order to denoise precisely.

Noise level Adjustor

The KF-8011 features a pair of large Level Meters and 10-step type level Adjustor for setting and monitoring the suitable level pint of program sources. In addition, the volume of cut-off noises can be controlled by the Noise level Adjustor. That means KF-8011 always functions so as to keep the S/N ratio the best condition.

Sufficient Input Jacks

As the Denoiser is to be connected to the Rec/Play terminals of an amplifier, KF-8011 has the complete input and output for tape decks including DIN connector. It also has 4 pairs of input jacks and by the Input Selector on the front panel 4 sources are switchable.

Check System for Denoising Condition

The built-in Defeat Switch permits to check the denoising condition - what frequency range is to be denoised, how much the S/N ratio has been improved, etc.

Automatic Circuit Switching

As shown on the following diagram, the Denoiser is to be inserted to the input side when making refined recording, and to the output side when enjoying refined playback. It is, however, quite needless to reconnect KF-8011. The Denoiser Position on the front panel switches the circuitry automatically.

Specifications

Frequency Response:  10 Hz - 80 kh ±0,5 dB

Noise Blocking Characteristics (0db =1 V, at 3,5 - 12 kHz):

Input Level / Noise Blocking Amount (S/N Improving Ratio):

0 dB / 0 dB

-30 dB / 0 dB

-40 dB / 2 dB

-45 dB / 10 dB

50 dB / 15 dB

Noise Blocking Filter Frequency Response:

3 - 4,5 kHz : -8 dB (1 kHz = 0 dB)

4,5 - 6,5 kHz : -8 dB (1 kHz = 0 dB)

6,5 - 10 kHz : -8 dB (1 kHz = 0 dB)

10 - 15 kHz : -8 dB (1 kHz = 0 dB)

(-20 dB at following points:  3,5 kHz, 5,5 kHz, 8 kHz, 12 kHz)

Gain:  0 dB ±1 dB

Maximum Input:  8 V at level Control "0" position

Distortion:  less than 0,09% (5,5 kHz, 1 V input)

Input Impedance:  More than 50 k Ω

Output Impedance:  1 k Ω

Level Difference of Counter-Channel:  Within ±1 dB (1 kHz)

S/N Ratio:  Better than 75 dB (1 kHz, 0 dB =1 V)

Channel Separation:  Better than 55 dB

Input and Output terminals:

4 x Input

2 x output

1 x Tape paly, Tape Rec

1 x Tape DIN

Switches and Controls: 

Tape Monitor Switch;

Large VU Meter;

De-Noiser Position Selector;

Filter Defeat Switch;

Level Control;

Noise level Control;

Through Switch

Power Voltage:  110 - 120 V, 220 - 240 V; 50/60 Hz

Power Consumption:  10 watts

Dimensions (W x H x D):  408 x 134 x 280 mm (16-5/16" x 5-5/32" x 11-1/32")

Weigt:  6,4 kg (14 lbs)