Why the plastic box entry home theater set 8-inch subwoofer does not meet the requirements
November 15, 2020
Home Theater Network () Why do you say that the plastic box's brand-name entry home theater set 8-inch subwoofer does not meet the cinema standard requirements? Today we will prove by actual measurement that the test speaker is Boston Boston SoundWare XS SE 5.1.
2.5-inch speaker, 8-inch small gun:
In order to accurately analyze the test results:
The blue line is 0.19 meters short-distance test satellite box original frequency response: Â±5DB below 200HZ, the bass part below 200HZ has no playback capability;
During the commissioning, the frequency response of the two gun positions in the listening position was found to be insufficient for dive, and 40HZ rolled off, and the following frequencies could not be analyzed:
In order to further confirm whether the space is causing the roll below 40HZ or the dive of the gun itself is insufficient, the near-range measuring gun has a native frequency response:
The blue line starts to fall for the original frequency response of the gun 45HZ: the gun frequency is 40HZ-150HZÂ±3DB;
This is the official parameter of the product:
It can be seen that the frequency response of the speaker is 150HZ dive, and the actual measurement is 200HZ, which is obviously exaggerated;
The subwoofer's marking is completely in line with the instrument's actual measurement:
Any audio and acoustic specification in the world is defined. The frequency above 120HZ will have obvious directionality. For the subwoofer, the upper limit must be limited to 120HZ or below. Otherwise, the gun will not be invisible, that is, it can be obviously felt. To the direction of the gun. More home theater acoustic knowledge, welcome to follow WeChat: cnhifi.
Storm Circuit has been producing Multilayer PCBs for over 10years. Over the years, we have seen all types of multilayer constructions from various industries, answered all types of multilayer questions, and solved all types of problems with multilayer PCBs.
Multilayer PCBis a circuit board with two or more layers. The material unlike Double-Sided PCBs with only two conductive layers all multilayer PCBs is that it must have at least three layers of conductive material, and the PCB boards are buried in the center of the material.
Benefits of Multilayer PCBs (compared to single or double-sided PCBs)
Higher assembly density
Smaller size (considerable savings on space)
Easier incorporation controlled impedance features.
EMI shielding through careful placement of power and ground layers.
Reduces the need for interconnection wiring harnesses (reduces overall weight