Audio Database


NEC AV-251
49,800yen(around the 1987 time)

audio-video surround processor put on the market as an entry-level machine which enjoys a surround play freely.

Three kinds of surround modes, Dolby surround, hole surround, and matrix surround, are carried.
Moreover, the surround indicator which can check the level of each channel at a glance is carried.

It carries in the delay circuitry with the original digital delay of NEC.

Two-channel power amplifier is carried as an object for a drive of rear 、 or a front speaker.

Four images, five audios, and the input terminal for built-in amplifier are carried as an input terminal.
Moreover, one two image + monitor, three audios, a pre out, two monophonic recordings, and a speaker termination are carried as an output-terminal.

The master volume, the front / rear volume, and the light (a front/rear) / left (front/rear) volume are carried, and a sound field control is possible.

The remote control which can control the change in surround mode, volume control, a balance coordination, etc. is attached.
It is possible to make remote control memorize a setting of a volume to three kinds.

Rating of a mode
Form audio-video surround processor
<Amplifier part>
Effective output 40W+40W (1kHz, EIAJ, 6ohm)
Frequency characteristic 20Hz - 40kHz
THD 0.03%
<Input/output part>
Video input sensitivity 1 Vp-p/75ohm
Voice-input sensitivity 150mV / 47kohm
Video input Four lines
Voice input Five lines (stereo)
Two Main(s)
Image output Two lines
One Monitor
Voice output Three lines
Four PRE
<Processor part>
Processor scheme Dolby surround
Hole surround
Matrix surround
Latency scheme Digital (20ms, fixture)
Supply voltage AC100V, 50Hz/60Hz
Power consumption 75W
Dimensions The width 430x height 91x depth of 360mm
Weight 6.2kg