NEC AV-251
¥ 49,800 (around 1987)
Commentary
This AV surround processor was released as an entry-level machine for enjoying surround sound reproduction.
Equipped with 3 types of surround mode : Dolby surround, hall surround and matrix surround.
It also has a surround indicator that lets you see the level of each channel at a glance.
The delay circuit is equipped with NEC's original digital delay.
A 2-channel power amplifier is installed to drive the rear or front speakers.
Input jacks for four video channels, an audio Line 5, and a built-in amplifier are provided.
Outputs include two video channels and one monitor channel, audio Route 3, pre-out, two monaural channels, and speaker channels.
Equipped with master volume, front / rear volume, right (front / rear) / left (front / rear) volume, sound field control is possible.
It comes with a remote control that enables you to change the surround mode, adjust the volume and adjust the balance.
The remote control can store up to three types of volume settings.
Model Rating
| Type | AV surround processor |
| Amplifier Unit | |
| Effective power | 40W + 40W (1 kHz, EIAJ, 6 Ω) |
| Frequency characteristic | 20 Hz to 40 kHz |
| Total harmonic distortion factor | 0.03% |
| <Input / Output Unit> | |
| Image input sensitivity | 1Vp-p/75 Ω |
| Speech input sensitivity | 150mV/47k Ω |
| Image input | Route 4 |
| Voice input | Line 5 (stereo) Main2 route |
| Video output | Route 2 Monitor1 system |
| Audio output | Route 3 PRE4 system MONO2 system |
| Processor Part | |
| Processor system | Dolby Surround Hole surround Matrix surround |
| Delay system | Digital (20 ms, fixed) |
| <Others> | |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 75W |
| External dimensions | W 430x H 91x D 360 mm |
| Weight | 6.2kg |