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Ai's systems are designed to be as accurate as possible in almost any setting. Not only does this most easily provide an even response, it makes tuning a system towards a specific objective, or the specific tastes of the system operator, without having to first correct for the inherent limitations within the system. By being as accurate as possible to begin with, alterations can be made to the system without fear of disturbing the corrective EQ that would normally have been done to achieve a flat response. Ai's speaker systems are designed to be as accurate as currently possible in small and medium-sized venues. Almost any venue smaller than a full scale arena will benefit greatly from this technology. Ai's research shows that non-direct sounds should arrive later than 10 to 20 milliseconds (depending on frequency) in order to be perceived as part of the reverberant field. Sounds arriving earlier than this can confuse the human hearing mechanism and detract from the clarity of the sound. This is most easily discerned in normal designs as a reduction in overall image clarity (placement of specific instruments or sounds within the projected sound field). By correctly limiting a loudspeaker's directivity characteristics, it is possible to reduce the amount of reflected sound arriving before the 10 to 20 millisecond threshold. This creates a loudspeaker that is not only more accurate, but is significantly easier to setup properly in a real room. This is achieved in Ai's true constant directivity (CD) waveguides. Frequency response is virtually flat up to off-axis locations of 22.5° (a 45° arc) and is uniform and smooth at every point contained within this coverage pattern. Beyond 22.5°, high frequencies (1000 Hz and up) roll off virtually flat with frequency, diminishing evenly moving further off axis. The polar pattern at the crossover point is perfectly matched between the low frequency driver and the high frequency waveguide. This correct polar pattern and matching between drivers is possible because of proper waveguide design and acoustic (time) alignment between drivers. Consequently, the loudspeaker has an almost perfect impulse response. The waveguide itself is the result of decades of research and modeling. It is designed to deliver the optimal coverage pattern while producing the least amount of Higher Order Modes (HOM), which are a distortion present in all horn and waveguide shapes to varying degrees. HOM are a form of resonance that occurs within a horn or waveguide that color the output, producing the familiar "horn sound" that has become the main drawback of other horn designs. These HOM are then further attenuated by the use of a patented Refractive Waveguide PlugTM, which works by lowering the level of the HOM relative to the direct sound. This is possible because HOM do not travel directly through the waveguide, instead reflecting multiple times on their way out. Because of this, they can be attenuated to a much larger degree by the acoustic foam in the plug while the desired sound, traveling a direct path, is attenuated very little. The direct sound is allowed to emerge from the waveguide unaltered while the HOM are significantly reduced in level. Cabinet edges as well are a source of distortion. On many loudspeakers, baffle edged allow sudden change in pressure which creates virtual sound sources, lines of early diffraction that produce sound that falls within that 10 to 20 millisecond window and which effect overall sound quality. This is alleviated in Ai's loudspeakers by the addition of rounded edges that virtually eliminate the effects of edge diffraction. This complements the waveguides directivity, which reduces the amount of energy reaching the cabinet edges. Combined, these result in a cabinet producing significantly less diffracted sound than other designs. In the ESP line, the cabinets are made of a propriety composite of fiberglass, MDF, and molded high density foam. This results in an acoustically dead cabinet that is as stiff as possible for its weight while allowing its integral waveguide to be formed to the highest tolerances. A thick aluminum back plate acts as a heat sink to lower the internal temperature of the enclosure and the loudspeaker drivers when operating. The ESP line uses sealed enclosures for all of its main speakers. Using a sealed enclosure greatly simplifies the use of subwoofers, while lowering cone excursion. |
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