NEC AV-300typeII

Commentary

AV Surround Center with digital delay.

Equipped with a digital delay, analog signals are A/D converted once and controlled in digital form, resulting in significant improvements in characteristics.
This circuit consists of a 16-bit linear successive approximation type A/D converter, 16KbitS-RAM and address control IC, and can set a delay time of 15/20/30msec.

Three surround modes are available : Dolby surround, hall surround, and matrix surround.
Dolby Surround obtains surround information by adding a subtle time delay to the (L-R) difference signal in addition to the normal 2 ch signal. In Hall Surround, normal stereo playback is performed from the front speaker, and a composite signal of reflected sound (L + R), assuming a concert hall, is echoed from the rear surround speaker.
In matrix surround, a 2 ch signal, which is a slight mixture of left and right signals, is played back from the front, and the reverse phase component of the opposite ch is added from the rear.

Equipped with a surround indicator that allows you to check the current surround control status at a glance.
You can turn it off if you don't need it.

When playing Whole Surround, you can adjust the amount of surround echo to your preference.

Equipped with a full mute switch, you can stop all sounds at once.

It is equipped with three types of volume : a master volume that can adjust the volume of all channels simultaneously, a 4-mode balance volume that can control the front 2 ch / rear 2ch/R-side 2ch/L-side 2 ch, and an individual volume for each channel.

It is equipped with a synthetic stereo function, and by passing a monaural signal through a digital signal processing circuit, it can be converted into a pseudo stereo.

A bypass position is provided when surround sound is not necessary.

It is equipped with tone control which can adjust the sound quality of front and rear respectively.

It has a built-in image enhancer that corrects the contour of unclear images and reproduces clearer images.
The enhanced amount can be switched between 2 levels of 3 db and 6 db.

Equipped with a 4-channel independent power amplifier.
This amplifier can also be used as a 2-channel amplifier by BTL connection.

It comes with a wireless remote control that enables you to change the surround sound, select the delay time, and adjust the volume of each channel.
The memory function of this remote control allows you to store up to three types of surround position, volume and delay time.

Model Rating

Type	AV Surround Center
Amplifier Unit
Effective output (1 kHz, 5%, 6 Ω)	50Wx4 100W + 100W at BTL
Total harmonic distortion factor	0.03% (at 20W output)
Signal-to-noise ratio	Main in:100dB
Input part	Audio : Stereo Route 3, two mono lines Image : 4 systems
Input Sensitivity / Impedance	Sound input : 150mV/47k Ω Video Input : 1Vp-p/75 Ω
<Processor Unit>
Surround format	Dolby Surround Hole surround Matrix surround
Delay system	16-bit linear quantization (digital)
Delay time	15, 20, 30 msec
<General>
Power consumption	165W
Maximum external dimensions	Width 430x Height 110x Depth 340 mm Width 430x Height 122x Depth 359 mm (max)
Weight	9.5kg
Attachment	Wireless Remote Control AR-301