[Home Theater Network HDAV.com.cn] Professional audio-visual room usually uses low-frequency traps when doing decoration acoustic treatment. How much effect can low-frequency traps play and how to use them correctly? The following is a sharing from the famous architectural acoustics expert Xiao Chun, speaking with data:
The original data is quoted from an audiophile in the new era of audio and video:
Good practice, about 120HZ absorption is obvious, 90HZ standing wave node below the ultra-low frequency almost absorbs the ability to exhaust! This DIY as a low-frequency trap is indeed worthy of the name, but the ultra-low frequency is still still stretched! To DIY out to the ultra-low frequency Effective low-frequency traps may not have a clear example in China at present; the time required may be longer
Next, we will share one of the more than 300 audio-visual rooms collected by our training test. The data and the sense of hearing have obvious effects on the ultra-low frequency above 50HZ:
The above is the data is not added to the low frequency trap:
The following data is added to the low frequency trap:
From the data point of view, the low frequency trap is multiplied at 63HZ, 125HZ, 250HZ, with obvious reverberation time reduction and fast energy consumption. And because of the rush of time, I was unable to make more in-depth measurements and analysis!
Next, share the data that is being processed in the ultra-low frequency data that is being developed: (because it is a company behavior, you can't open the way, don't like it):
The upper part of the picture below is the Waterfall of the XTZ blank, and the lower part is the Waterfall of the Zenith internal tester.
5.1*5.3*3.3 square:
Before the above treatment: Waterfall is attenuated from 95DB to 90DB after 250 milliseconds at 30HZ standing wave node, and the attenuation is 5DB; and 30-100HZ is almost no attenuation at all!
After the following processing: Waterfall is attenuated from 70DB to 48DB attenuation amount 22DB after 250 milliseconds at 30HZ standing wave node, and the ambient noise outside the 30HZ non-standing wave node is almost completely attenuated to below 40Db!
Appearance after processing:
The lower half of the figure below is the measured frequency response curve before the renovation. The upper part is software simulation:
After the acoustic treatment, the emperor's left, right, and right points of the measured frequency response curve:
Both Zhenli and XTZ testers have the same test results for single-point ultra-low frequency waterfalls:
Uniform bit frequency response curve test consistent
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