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Continue the audiovisual topic. Since the release of DVD program CDs, the idea of moving the cinema home has been a pursuit of people. After several tosses, people now seem to be gradually abandoning formal cinema and pursuing practical effects.

1, the first dispute between audio and video is the display screen.

The pursuit of form must pursue the projector, because the projection is completely cinematic form. However, the projection needs to hang the screen, requires a completely black environment, and the negative effects of constant current power consumption, lamp life, and heat dissipation noise are gradually revealed.

With the large-scale price reduction of self-illuminating OLED and HIFI-level RGB (red, green and blue) three-element backlighting LCD displays, people have begun to turn their attention to large-screen TVs with actual image display quality. It not only has relaxation requirements for ambient brightness, but also general curtains can fully express image clarity, contrast, color pack and degree, and the power consumption of the whole machine changes with brightness.

I measured that the darkest image of OLED TV is only 30W, and the brightest (full white screen) is only 110W. The 70-inch zoned back-illuminated LCD is also in this power consumption area. This is much more energy efficient than the projector’s constant 280W (home) — 1200W (dedicated cinema projection) power consumption and plasma TV’s constant 640W power consumption. Don’t say that rich people don’t care about this electricity bill, behind the electricity consumption is that each kWh of electricity needs to burn 7 taels of coal, giving us carbon dioxide, sulfur, dust emissions and atmospheric temperature rise. Therefore, energy conservation is not a matter of personal pockets, but also a matter of love for others and human homes, and a problem of personal cultivation image.

2. Is home theater lower than HIFI sound requirements?

According to international standards, the audio of home theater is 20-bit quantized, 48 kHz sampling digital 5.1-channel audio; most of the HIFI sound dynamics and frequency response with CD as the program source are an order of magnitude lower than that of theaters. 5.1 pairs of two channels also have 4 more amplifiers and speakers.

Home theater has higher positioning of sound and image than two-channel, so the accompanying sound playback has higher requirements for multi-channel consistency of the sound and the environment for sound interference. It can be seen that HIFI enthusiasts are ignorant of AV system discrimination.

The electroacoustic equipment of the film, whether it is recording production or the restoration of the cinema, is higher than the film music and broadcasting equipment. In the past, there were 100,000 8-channel analog movie recording consoles. 5.1 Mixing ability requires more from sound engineers. People’s misjudgment is because home AV power amplifiers are lower in price than HIFI, and the reason is that AV power amplifier sales are far higher than HIFI. AV amplifiers are actually the most technical content of any audio equipment in the home. It is not only 5 power amplifiers in one, but also the highest in digital processing ability and automation ability.

I have tried Yamaha’s new audiophile 2000 amplifier and AX1 AV amplifier, the same program, the same speaker (JBL L1), and the result is better AV amplifier sound quality, fuller bass, softer and more delicate mid and high frequencies, and better dynamics. The reason is that although the price of the former is high, because the sales volume of HIFI advanced positioning is pitiful; Although the power is similar, the AV amplifier has made this room acoustic adjustment, which obviously resists the impact of acoustic defects in the room without acoustic decoration; Moreover, AV power amplifier is 10 1792 chips, carefully designed and manufactured adaptive decoding system. I am a Sony DVD player, analog signal into audiophile amplifier, digital audio fiber into AV amplifier.

How to configure home theater speakers

Because the movie is visual, when the plot of the movie attracts attention, the sound is clear, especially the middle is clear. But art performances, scenery films, 5.1 are important. But it doesn’t have to be as harsh as movie standards, otherwise the cost is too high. The little family is angry.

(1)5.1? 7.1? 13.2?

According to friends who have done film mixing, the standard of movie accompaniment is Lucas’s 5.1. The cinema seems to be 24—48 surround speakers, which is also considered to be scattered and distributed by 5.1 with a large audience. More surround channels, there are real and false: the real mix is made according to greater than 5.1; the fake is the selling point gimmick added by AV amplifier manufacturers, which is added by 5.1 through DSP delay reverberation processing.

Therefore, I think that the home space environment is small, and 5.1 is the best choice.

(2) Is the speaker active or passive?

The passive cost is low, which is enough for the small family environment. Active can reduce speaker line loss and is more suitable for larger rooms. It requires balanced transmission to reduce interference noise and higher resolution.

So I went through too many tosses to form the result:

Large home theaters —— use more than 70 inch LCD monitors, 5.1 front stage, active speakers, decisively eliminate projectors, for karaoke.

Small cinema—— 55-inch OLED TV plus 5.1 power amplifier, passive speaker, active subwoofer

Personal desktop theater—— professional computer monitor, 2.1 theater, active monitoring plus cannon HIFI, AV, Internet access