[Home Theater Network HDAV.com.cn] Good sound comes from the common results of equipment balance, space matching, power supply, debugging professional, good vibration isolation, wire just right and so on. The day before yesterday, I grabbed the data of a new audio-visual room and could throw a brick at a small point. The personal perspective of this space is not perfect on the acoustic level, at least remarkable. In this case, the problem of continuing paranoia will be less interference and a more accurate judgment. In the hard work, the level is limited. If it is not enough, welcome Yazheng!
Photo in debugging:
The commissioning is completed for subjective testing:
The design value of the indicator before signing:
12 flat volume 37 cubic meters, according to THX and HAA international specifications, calculate the exact reverberation value that best fits this space:
In the case where the sofa and the carpet tile have not been deployed, the MIC is listening to the sound position, and the measured reverberation time of the right front box:
125HZ-4KHZ international 6 times the frequency of the measured reverberation time 0.2-0.25 seconds; after the full installation, the accuracy of the index is above 95%, the knife planer does not off!
The blue frequency response curve is that there is no absorption on the ground between the box and the MIC, and the reflection causes a frequency depression of around 250 Hz.
The green frequency response curve is: put 2 backpacks on the ground between the box and the MIC to temporarily replace the carpet.
Frequency response according to THX low frequency plus 10DB, medium and high frequency ± 2DB, full frequency basic ± 5DB no problem (box itself frequency response ± 3DB)!
No sound absorption on the ground between the box and the MIC
There is a sound absorbing material on the ground between the box and the MIC
The true-force acoustic tape measure is about 1.1-1.7 meters from the ground to the MIC, and the frequency range of the reflection caused by the reflection is 200-300HZ in line with the acoustic tester. The linear distance of the MIC measured by the range finder to the speaker is 2.4 meters;
The six faces of the space, except that the floor has not been placed on the carpet and sofa according to the design requirements, all can be seen from the reverberation time and frequency response all meet the expected requirements, and only because of the small carpet that has not been deployed yet. Bringing a sure data to the sound dyeing, I believe that the embodiment of the data will definitely affect the performance of the sound. In the toss of the enthusiasts, this and related various kinds of erosion of the sound performance, because the degree of cultivation of the enthusiasts are different, but are found to different extents or can not be found. But whether you find it or not, it is there, you won't get better yourself and you won't get worse!
Green is the right front frequency response, blue is the left box frequency response, relatively high consistency, the reverberation time is measured by the left box, the entire space reverberation time is extremely uniform, and the height is balanced.
The subwoofer is a XX shock 12-inch subwoofer (sweat):
The blue line is the measured native frequency response of the gun close range:
Green is the measured frequency response of the listening position after debugging:
Red is the residual energy of the subwoofer after debugging for 250 milliseconds in the waterfall waterfall:
Close the window to measure the noise floor (left), open the window to measure the local noise (right):
The debugging is over. Author: Chinese small space acoustics first database (collecting and analyzing more than 300), CIT \ Cedia traveling exhibition invited 12 city ULF speech, Chengdu International Audio Festival invited lecturer in acoustics: YANG Ying-Chun
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