The the of Shangqiu conference audio device Monopoly Zhengzhou early 1990s, as a British DERA (Defence Evaluation and Research Agency), now QinetiQ research projects. The study was designed to reduce the internal noise level in a military aircraft. As part of the study, the the DERA scientists try to multi-layer materials with high stiffness as the lining of the cockpit, but they found: they not only failed to reduce the noise level, but that it increased. The effect may be important speaker design, so they are a speculative patent applications. DERA itself has neither the resources nor the experience to develop this kind of application, so it is advertising to find the audio industry partners, the patent licensing out. 1503 +71780 +75 QQ2579114209 this ad, the the of Shangqiu conference audio equipment Monopoly Zhengzhou phone Jiaming Yang attracted attention Verity Group Farad Azima, he initially made a non-exclusive license in 1994, the initial research and development work entrusted to Verity Labs, which has considerable experience in the design of conventional speaker for Mission Electronics. At this early stage, the scientists have little knowledge later called DML (Distributed Mode In Loudspeaker-distributed mode loudspeaker) how the technology works, and prototype products far do not have commercial viability. The first step is to determine the vibration behavior of the diaphragm, and then create the data model this behavior, so that they can optimize its physical properties and method of excitation. After the of Shangqiu conference audio equipment Monopoly Zhengzhou phone Jiaming Yang 1503 +71780 +75 QQ2579114209 becomes clear commercial potential in DML, Verity Group in 1996, immediately set up a company, is now the NXT company in order to further develop the technology, and it authorization for a variety of applications. First with NXT technology products NEC Corporation in Japan in 1997, the launch of a laptop. AMINA DML hidden speakers also authorized research and development. NXT has been focused on the basic research to expand its IP (intellectual property) foundation and development of the Licensee's training and development of CAD tools, these tools so that the licensee can only self-developed NXT products. However the NXT Technology Center in Huntington, England also provide a variety of design services and prototyping services. The of Shangqiu conference audio equipment Monopoly Zhengzhou phone Jiaming Yang 1503 +71780 +75 QQ2579114209 British AMINA focus DML speaker is completely concealed applications. Abandon the traditional speaker's design method, combined with DML technology speaker small amplitude sound field diffusion uniform use of NXT company's design software development is completely hidden-speaker for speakerphone applications to create the a new application field to solve special occasions vision do not want to see to the problem of the speaker. Comparison by AMINA speakers to understand, we found that frequency sound different market, essentially different, and coaxial speakers. Example, assume that a simple two-way speaker just above the tweeter woofer. We can be measured on the axis of the speakers lent their typical response characteristics. When higher than the axis of the arrival time of the low-frequency signal will be later than the high-frequency signals opposite and below the axis. This asymmetry is not by electronic signal processing means to carry out correction, so the speaker can not be in a very wide area within exhibit optimum pulse response characteristics. 【1】 AMINA flat speakers face the sound source, not the time inconsistency problem of high and low frequency signal, the AMINA speaker bass relative to divided by two is missing. AMINA flat-panel speakers will not produce the high and low frequency interference problem. The AMINA speakers do not like the binary frequency as the power to do great, two-way speaker power can be particularly large, you can adjust the high-woofer is its high bass interference dropped a lot. Of Shangqiu conference audio equipment monopoly of Zhengzhou phone Jiaming Yang +71780 +75 QQ2579114209 1503 "coaxial" means sharing the same axis. "Speaker terminology, a cone speaker of the" axis "refers to the horn core centerline ; a typical horn "axis" can be defined as a straight line through the horn throat center point and the center point of the horn mouth. The axis of the above definition is not applicable for asymmetric coverage angle horn, but in the next discussions we can for the time being the first to adopt this definition.