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楼主 |
发表于 2011-12-16 14:39
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为了严谨一点,又上了Seas的官网,E0011的手册上的推荐的频率下限是2000Hz,考虑到一般的厂商总是把自己产品 ...
hya1951 发表于 2011-12-16 14:14 
关于单元的选择，老林是这么回答的，1440HZ/24 dB/oct 的分频点选择主要是为了考虑8寸的中音单元
Q6 - Why did you not use driver XYZ?
A4 - One of the objectives for the ORION was to design it as a 3-way system. A 2-way system would have a restricted low frequency range or have insufficient output. A 4-way system would have added complexity and cost, yet not improved the speaker's performance for the intended application. Thus, I looked for tweeter, midrange and woofer drivers that had the necessary volume displacement, polar response in an open baffle, low stored energy, and low non-linear distortion. In addition the drivers must be available world-wide. The Peerless 10" diameter XLS woofer, 830452, has large excursion capability, very low air turbulence noise, relatively low distortion, limits safely, has very low Qts due to a strong motor, and is ruggedly built. The 8" diameter magnesium coned Seas W22EX001 Excel midrange has exceptionally low linear- and non-linear distortion over the 120 Hz to 1400 Hz frequency range used. Since the 8" driver is mounted on an open baffle of carefully designed size it has much wider dispersion at 1400 Hz than the same driver in a closed box with the same frontal baffle. I would have had to use two 6.5" drivers in a less favorable MTM arrangement to obtain the same low frequency volume displacement, yet the the narrower open baffle would have yielded little benefit in off-axis response. The 8" midrange is matched to the Seas T25CF002 Millennium 1" soft dome tweeter, which has a smooth frequency response, low stored energy, wide dispersion and can be crossed over at a low 1400 Hz through 24 dB/oct filters. The low crossover frequency is dictated by the distortion and open baffle response for the midrange driver. A ribbon driver in place of the dome tweeter would have narrower vertical dispersion, could not be crossed over as low in frequency and would be less rugged. The Millennium tweeter uses ferro-fluid in its voice coil gap for improved heat transfer to the pole piece. This reduces thermal compression from continuous high sound and amplifier power output levels which raise the voice coil temperature and thus the coil resistance. For example, a rise in coil temperature from 20 0C to 70 0C (68 0F to 158 0F) would reduce the tweeter output level by about 1.5 dB. Since the midrange driver voice coil is likely to heat too, the tonal balance would essentially remain unchanged and the insufficient increase in output level would not be noticed.
I consider the drivers used for the ORION to be state-of-the-art. I have not seen, heard and tested drivers that would make me change them, though I keep looking for any worthwhile improvement. |
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发表于 2011-12-16 14:14
谢谢版主分享，学习了
很强悍
