NEC AV-250
¥ 44,800 (around 1986)
Commentary
An AV surround processor with a Dolby surround decoder.
It is compatible with Dolby Surround, which reproduces surround information by adding a subtle time delay to the (L-R) difference signal in addition to the normal 2 ch signal.
It has two surround functions, matrix surround and hall surround.
In matrix surround, the 2 ch signal, which is a slight mixture of left and right signals, is sent from the front, and the reverse phase component of the opposite ch is added from the rear to increase the sense of spaciousness.
In Hall Surround, the normal 2 ch signal is played back from the front, and the (L + R) composite signal is echoed from the rear.
It is equipped with four input terminals for video equipment and one input terminal for audio equipment. At the same time, it is equipped with output terminals that allow editing of up to three devices and two mono outputs that are convenient for connecting a subwoofer or center channel.
It is equipped with a stereo power amplifier that can drive the front or rear speakers. This amplifier has an independent input terminal and can operate independently.
It also has a 4-channel pre-out terminal that can be connected to an external amplifier to control all surround selectors and volume.
If the built-in decoder exceeds the maximum allowable input, an overload indicator will light to indicate this.
It is equipped with three types of volumes : master volume, 4-mode balance control volume, and individual volume for each channel.
Equipped with a one touch preset volume function (sound memory function), you can store up to types of volume and balance according to your preference.
It is equipped with a Hall Effect Control function that can adjust the amount of sound echo in Hall Surround.
It comes with a remote control that can control 3-mode surround sound, volume adjustment, balance adjustment, volume memory, etc.
This remote control can also control videos such as VC-N8HF, N31, N5, N3, N63, and N65 made by NEC.
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Model Rating
| Type | AV surround processor |
| Surround format | Dolby Surround Matrix surround Hole surround |
| Effective power (EIAJ) | 35W + 35W (8 ohm, 1 khz) |
| Frequency characteristic | 10 Hz to 40 kHz |
| Total harmonic distortion factor | 0.03% or Less (at 1 kHz, 8 Ω, 20W) |
| Input Sensitivity / Impedance | Sound input : 150mV/47k Ω Video Input : 1Vp-p/75 Ω |
| Input part | Image : 4 systems Audio : Line 5 |
| Output part | Video : Route 3 Audio Stereo : Route 3 Audio mono : 2 systems |
| Main amplifier input | 1-system (stereo) |
| Preamplifier output | 2 systems (stereo) |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 75W |
| External dimensions | W 430x H 90x D 212 mm |
| Weight | 4.6kg |
| Attachment | Wireless Remote Control AR-300 |