Audio Database

The

NEC AV-7000D
89,800yen(around the 1988 time)

Description
 
Digital one / surround amplifier which carries twin PLL.

The low-pass play at the time of the Oide power is raised by carrying the original reserve power source of NEC carried also in A-10 series, and carrying another power source which delays the phase of an output 90 degrees and fills the valley of a ripple.

In order to align correctly the source in which sampling frequencies differ and to carry out a higher-precision translation by a digital analog converter, the twin PLL circuitry is carried.
In this circuitry, the Jitter was sharply decreased by considering the PLL circuitry for a clock extraction as a two-step stream composition in series, and the modification of a tone quality is realized.

Carry the oversampling digital filter in the D-A-conversion part 8 times, and the digital-audio signal was made to approach the wave which was smoother and continued, except an audio signal, it made it possible to use a very high frequency component, and the burden of a low pass filter is eased. This has realized the expansion of a passband, and the modification of phase distortion.
Moreover, by making the digital analog converter of glich res which makes a deglitcher circuitry unnecessary a twin stream composition, the phase difference between right-and-left both channels is lost, and the modification of the S/N ratio is aimed at.

The surround circuitry of Dolby surround and hole surround is carried.
Moreover, the acknowledged digital delay was adopted as the delay circuit, and little surround play of a noise is realized.

A selector functionality can be used also by a power stand-by state.

The digital direct switchpoint is carried, and if a switchpoint is turned ON, regardless of the status of digital ones/analog switch, the source of hope can be chosen only with a digital input switchpoint.
Moreover, the surround circuitry operates in this status.

BS Lec switchpoint is carried, and a satellite broadcasting can be recorded and recorded regardless of the status of other switchpoints with the video system and audio equipment which were connected to each termination of Video1, Video2, and Tape2.

The REC selector which can record special NetWare programs other than a monitor is carried.
Moreover, the surround selector which makes an image and voice cross and can do a picture recording and a sound recording is carried.

The speaker-off switchpoint and the mono-out termination are carried.

The motor volume whose volume can be controlled is carried in the volume with remote control.

Wireless remote control is attached and NECBS tunerNE-BST5000 and NE-BST2000 can be controlled.

Rear Attached
Twin

Rating of a mode
Form audio-video surround center
<Amplifier part>
Output power Front: 80W+80W (20Hz - 20kHz, 0.009%, 6ohms)
Rear: 20W+20W (1kHz, 5%, 6ohms)
THD 0.009% (1kHz, 6ohm, 80W)
Frequency characteristic 10Hz-100kHz+0 -3 dB
S/N ratio Phono:76dB
High Level:100dB
Tone control Bass: ±10dB (100Hz)
Treble: ±10dB (10kHz)
Delay time 20msec (rear speaker)
<Digital part>
Correspondence sampling frequency 32kHz, 44.1kHz, 48kHz (automatic switching)
Input sensitivity/impedance Light: -23dBm-+14dBm
Coaxial: 0.5 Vp-p/75ohm
An Output voltage/impedance Coaxial: 0.5 Vp-p/75ohm
<Analog part>
Input sensitivity/impedance Phono: 2.5mV / 47kohm
High Leve: 150mV / 47kohm
An Output voltage/impedance Rec out: 150mV / 2.2kohm
<Video-system part>
Input sensitivity/impedance Video: 1 Vp-p/75ohms
S terminal (Y signal): 1 Vp-p/75ohms
S terminal (C signal): 0.28 Vp-p/75ohms
An Output voltage/impedance Video: 1 Vp-p/75ohms
S terminal (Y signal): 1 Vp-p/75ohms
S terminal (C signal): 0.28 Vp-p/75ohms
<Synthesis>
Supply voltage AC100V, 50Hz/60Hz
Power consumption 250W
Dimensions Width 430x height 165x depth of 435mm
Weight 15.8kg
Adjunct Wireless remote control AR-7000D