Marantz AV251II
¥ 29,800 (around 1987)
Commentary
Equipped with two input / output terminals for VCRs, two input terminals for video equipment, one input terminal for audio equipment, and video / audio output terminals for monitors. In addition to four visual equipment, an audio / video controller that connects and controls an audio system and monitor TV.
The input / output terminals of the VCR-2 are mounted on the front panel convenient for additional connections such as dubbing.
An RF output terminal is installed so that it can be connected even if your TV does not have a video / audio input terminal.
It is equipped with a copy switch which enables mutual dubbing of VCR-1 and VCR-2 with one touch operation.
The monitor TV is equipped with an audio / video audio switching function that can switch only audio to audio while the video source remains on the screen.
The audio jacks of the VCR-1 and VCR-2 are equipped with stereo / monaural switches.
It is equipped with a sharpness control function which emphasizes the outline of the image and makes the image quality rough and noise inconspicuous, and reduces the quality loss caused by dubbing.
It is also equipped with a fader function that can fade in and out video and audio simultaneously.
It is equipped with a spatial stereo function to expand monaural sound such as VCR.
By controlling the middle and high frequency phase, which is most sensitive to the human ear, a natural sound spread is realized.
It is equipped with DNR (Dynamic Noise Reduction) which is effective for reducing the hissing of the normal audio track of VCR.
The DNR is a noise reduction system based on a variable band low-pass filter that varies from 1 kHz to 30 kHz depending on the signal spectrum. The noise reduction effect reaches 10 dB at the silent portion.
It is equipped with a microphone mixing function that can mix microphone sound with audio and video sound.
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Model Rating
| Type | Audio / Video controller |
| Video Input Sensitivity / Impedance | 1Vp-p/75 Ω (Unbalanced) |
| Video Output Level / Impedance | 1Vp-p/75 Ω (Unbalanced) |
| Audio Input Sensitivity / Impedance | 150mV/25k Ω |
| Audio Output Level / Impedance | 150mV/250 Ω |
| Signal-to-noise ratio | Video : 70 dB Audio : 85 dB |
| Frequency characteristic | Video : 6 Hz to 8 MHz Audio : 20 Hz to 20 kHz |
| Maximum external dimensions | Width 420x Height 43x Depth 215 mm |
| Weight | 1.8kg |