NEC AccuSync LCD71VM Service Manual page 69

2.4.3 Built-in speakers
Type:
Nominal Impedance:
Maximum Input Power: 1 W/CH
Resonance Frequency: less than 450Hz
Speaker Size:
When headphone connected to headphone jack, speaker outputs should be disabled.
2.4.4 Characteristic
Frequency band:
Total harmonic distortion:
Remaining behind hum:
Remaining behind buzz:
S/N ratio:
S/buzz ratio:
Channel separation:
Right/left output deviation:
Sound noise by vibration of cabinet should not be heard at condition of 70% volume, 1kHz 500 mVrms input,
250Hz to 20kHz range.
2.4.5 Audio Control
Following functions must be controlled by OSM.
Volume Control
Mute function
Speaker Output Power at 1kHz, 500mVrms, volume max 1 + 0.05W.
Volume control characteristic is similar as gamma 2.2 curve.
Micro Speaker (8Ω, 1W + 1W) without box
8 Ohm
40 x 20 mm
250Hz to 20kHz
3% (condition: 1W, all black)
2% (condition: 50mW,all black)
5mVp-p (max)
(Any noise shall not be heard from the point of 30cm distance from the
monitor.)
5mVp-p (max)
(Any noise shall not be heard from the point of 30cm distance from the
monitor.)
40dB (condition: all black)
40dB (condition: all white, contrast max)
30dB
±1%
5-6