请教JBL66000用两个相同低音喇叭设计的问题

nark

低音部分采用的两只380 mm直径的纸盘单元「1501 AL」，这两只单元所负责的频段有所分别，一只单元负责150Hz以下的低音，而另一只单元则负责30Hz以下的低音，通过此4只高性能单元的配合，实现整体真实频响范围45Hz-50kHz。”
   这段话是网上摘下来的，66000的两个低音工作在不同频率（上述可能有误，我理解是一只低音工作在150HZ以下，另一个工作在150—700HZ），它们之间共用一个箱体，没有间隔的，请问工作在较低频率的那个会不会对较高频率的那个造成干扰，引起失真？

61996199

肯定有干扰

dd2008

听说过 2.5, 3.5 ... 分频吗?

另一只单元则负责30Hz以下的低音

就是那个 ".5"

nark

Specifications for the DD66000EB - EVEREST II

   
   
   
   
   
General
On several occasions in the 60-year history of JBL®, the company’s engineers have been given the freedom to pursue pure sonic accuracy, wholly unconstrained by cost considerations and other inhibiting factors. From the influential Hartsfield monaural loudspeaker of 1954 to the first of the acclaimed Project K2® systems in 1990, each of JBL’s Project loudspeakers has been a milestone on the road to audio perfection, achieving ever-higher levels of performance, thus making these speakers objects of intense desire among audiophiles across the globe. The Project Everest DD66000 loudspeaker system doesn’t merely reassert JBL’s technological leadership, design aesthetic and manufacturing prowess for a new generation of music lovers. It literally embodies our passion for music. Begun in 2002 and completed for the company’s 60th anniversary in 2006, Project Everest is quite simply the most exquisite musical instrument JBL has ever constructed, delivering the highest level of musical fidelity. Once again fulfilling founder James B. Lansing’s vision of creating beautiful, high-performance home loudspeakers.
Maximum Recommended Amplifier Power 500 Watts (RMS)
Impedance 8 Ohms
Sensitivity (2.83V @ 1m) 96dB
Frequency Response 45Hz – 50kHz
Low Frequency-Extension 32Hz (–10dB)
Crossover Frequencies 150Hz, 700Hz, 20kHz
Ultrahigh-Frequency Driver 1" (25mm) Pure-beryllium compression driver (045Be-1) with 0.35"-throat Bi-Radial® horn  
High-Frequency Driver 4" (100mm) Pure-beryllium compression driver (476Be) with 1.5"-throat Bi-Radial® horn  
Low-Frequency Driver Dual 15" (380mm) Aquaplas™-coated, pulp-cone woofer (1501AL) with 4" edge-wound voice coil and EPDM rubber surround, and utilizing Alnico magnet  
Horn Directivity (horizontal x vertical) High Frequency : 100º x 60º
Ultra-High Frequency : 60º x 30º
Dimensions
(H x W x D) 43-2/3" x 38" x 18.5" (1109mm x 965mm x 469mm) (incl. feet , not spikes)  
Weight 302lb (137kg) without grille
313lb (142kg) with grille
per speaker

乌鸦

不用去怀疑人家了,旗舰箱还怕人家的技术成份不够? 设计很完美了的. 但不代表用其它喇叭仿造也没有互相影响.

okk

Low-Frequency Driver Dual 15" (380mm) Aquaplas™-coated, pulp-cone woofer (1501AL) with 4" edge-wound voice coil and EPDM rubber surround, and utilizing Alnico magnet  

没说 "这两只单元所负责的频段有所分别，一只单元负责150Hz以下的低音，而另一只单元则负责30Hz以下的低音，" 啊。是网上的讹传吧？

乌鸦

低音应该是并联的

nark

四分频的，刚找到一些资料

dd2008

3.5啦.

一只单元负责150Hz以下的低音，而另一只单元则负责30Hz以下的低音

看上图则以上说法的频率不对.

pkllt

可以理解成30Hz以下是2只低音发声，30Hz到150Hz是1只低音发声

dd2008

原帖由 pkllt 于 2008-5-25 10:44 发表
可以理解成30Hz以下是2只低音发声，30Hz到150Hz是1只低音发声

你从哪里看出30Hz到150Hz是一只低音发声?

y12356

150以上是一只,150到30是二只,3.5分频.

维卡亚

从那个SPL上看是3.5的分频

nark

原帖由 abob 于 2008-5-25 12:32 发表


除低音外

比较先进的声象定位设计，管善群先生最近的一个报告提到过

请问是不是那个管见，我想下来看下，但是下不了，再补一些资料

维卡亚

它的低音间并非带通式设计.所以是3.5分频.除非那个SPL和这个不对应.而下面说的那个中低间,如果是.5时也完全可以使用一个斜率及交叉点来标称.即使它不是4分

nark

听朋友说，他下了一份资料，里面有分频器的资料，晚上找到后我再发给大家看一下

nark

找到了，请看

nark