研究BBC标准的LS35A我个人获取资料的汇集。（工具贴）

uvd

子弹飞 发表于 2013-2-6 12:53
英国BBC广播公司设计部的第一对LS35A，这是LS35A的最初模型版本，编号为LS3/5A NO1。而且在LS35上面BBC设计 ...

好资料，收藏了！[s:21]

apehifi

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135mm套上+4近摄把 3/5a 上的这个小标牌拍下来。


  

uvd

子弹飞 发表于 2013-2-5 21:44
其实价格是其次，关键是东西，年代，状态，及真实度。我是新手，所以要多研究啊。

版主新手，我等就是新新新手啦……[s:21]

子弹飞

其实大家一致都关注的LS35与LS35A究竟有何区别呢？也一直是我所关心的事情。下这段介绍LS35，文字及图片。照片是由思奔达创始人斯潘塞休斯的儿子德里克休斯提供的，这是非常早的照片，时间大约在1972年。LS35低音单体是突出的。与模特合影摆放方式为高音向下，这种方式一直延续多久？还是监听柜高于人耳时，就要采用高音向下的摆位方法？

The prototyping work for the  LS3/5 ( without the "A" ) was done  in-house by BBC Research Department at Kingswood Warren. The work was based on Research Department's acoustic modelling work.



Many thanks to Terry Miles     who showed me this early ex-BBC Research Department prototype LS3/5     which was given to him by Spencer Hughes of Spendor. It was fantastic to see and handle     this speaker which would certainly have been worked on by Spencer and by Dudley Harwood     during the development of the LS3/5A. Note the blocked     hole in the front panel which suggests that perhaps tests were done on a Bass-Reflex     enclosure before the design settled on a sealed cabinet. The crossover is BBC type FL6/16 and the unit uses the KEF B110 and T27 .




The BBC made about 20 pairs of LS3/5s in house and put them into service in television outside broadcast vans before they invited outside manufacturers to apply for a licence. Rogers (under Jim Rogers) intended   to manufacture the speaker and issued a press release in February 1974.




Click     on the images for a larger picture. The LS3/5 has the B110 at the top and lacks     the tweeter protection grille and felt surround of the LS3/5A.

The Kingswood       Warren LS3/5As.



The LS3/5       was developed by BBC Research Department at Kingswood Warren. The design was fine tuned by measuremant, by compasison with the LS5/8 Grade A monitor and also with live sources including orchestras. As a result the development costs were very high and a figure of about £100,000.00 has been often used as an estimate. At 2011 values this is equivalent to between one and two million pounds sterling! Jim Finnie who worked at Research Department told me that the design team would often argue for a week over a change to the speaker that resulted in a 1dB change in its response. No commercial manufacturer could hope to compete with these kind of development resources and this is one reason that the design has been so highly acclaimed.

Several of the staff were very enthusiastic about the project and built their own pairs, fine tuning them for best performance. In addition the department made some pairs for use as references in house. These can arguably be considered the unlimate small monitoring loudspeaker, they were so finely tuned. Indeed the very tight tolerances required would prove a problem when it came to putting the speaker into production.

Jim Finnie has a pair of these very special loudspeakers. They can be considered the ultimate LS3/5As because they       came out of BBC Research Department and do not contain the modifications introduced later by BBC Design Department. The drive units were highly       selected and because of this the crossovers contain fewer components. Jim was       one of the staff who bought the parts to make his own pair. Jim's speakers       were built with the help of the expert technicians at K.W. having heard them       I can confirm that they are absolutely superb.



I am indebted       to Jim Finnie for allowing me to use the photographs of his KW LS3/5As.

子弹飞

uvd 发表于 2013-2-6 13:00
好资料，收藏了！

[s:21] 这资料对研究LS35A的玩家都会有帮助。是我转帖过来的，出处是可靠的。

子弹飞

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uvd 发表于 2013-2-6 13:36
版主新手，我等就是新新新手啦……

[s:21]我的确是新手。[s:18]

uvd

子弹飞 发表于 2013-2-6 13:48
这资料对研究LS35A的玩家都会有帮助。是我转帖过来的，出处是可靠的。

很有价值的资料！慢慢欣赏、研究！
猛一看，首先得出，LS3/5a是经多次认真研究实验的东东……:victory:

MOMO2018

我给版主大人顶顶贴～{:soso_e182:}

uvd

子弹飞 发表于 2013-2-6 13:38
其实大家一致都关注的LS35与LS35A究竟有何区别呢？也一直是我所关心的事情。下这段介绍LS35，文字及图片。照 ...

       子弹飞版主提供的图照很有价值。{:soso_e179:}

       经多次实验测试，最后BBC对箱体提出以下要求：箱体的体积略小于5升，封闭结构。箱板是12mm厚桦木胶合板，用榉木条内部固定。强调指出，只能用这种木材固定，其它任何更坚硬的木材如巴西杉，用于内部固定箱板都是不可行的。因其机械阻尼不能削除由箱体震动而产生的声染。而且为了降低这种声染，箱体侧板加装阻尼材料，侧板各一层，顶板及底板各两层。低频单元边用PVC制作以减少正面箱板震动所产生的声染。为减少箱体内的空气震动，除正面箱板外，其余内部表面全部用聚亚安酯做内衬，上下内衬厚度是25mm，侧面及背部是16mm。为防止音箱内部高声压外泄而产生的噪音，箱体全方位密封，螺丝孔也要密封……。{:soso_e181:}

uvd

请注意这句话：
“箱板是12mm厚桦木胶合板，用榉木条内部固定。强调指出，只能用这种木材固定，其它任何更坚硬的木材如巴西杉，用于内部固定箱板都是不可行的。因其机械阻尼不能削除由箱体震动而产生的声染。”
当前一些所谓纪念版LS3/5a,往往在这一要点上与BBC的要求相悖……{:soso_e107:}

100w

        子弹版兄，本来是复你贴，写完变成主帖了。{:soso_e101:}  {:soso_e181:}

http://www.jd-bbs.com/forum.php?mod=viewthread&tid=4638556&page=1&extra=#pid142809191

红山老猫2012

子弹版主好，

您的列出的那副 LS3/5a 的样板 （Prototype） 是不对的， 真正的Prototype是当年， 刊登在 Hifi News & Record Review 的那对，（简直像外星人用的喇叭！） 那份刊物我估计， 我已丢掉了， 无法转发。。。 遗憾。

做为一个用过6对 LS3/5a 的用家。 LS3/5a 是绝对值得欣赏的对象。 人家说，LS3/5a 不能爆， 我们几位朋友爆得不是普通人害怕， 连我们自己都害怕！ 它的“爆棚”的能力， 还是很惊人的 （试试雨果那张，苏联Balalaika 民族乐团的 “晚钟” 刚开始时， 没啥， 但乐曲音量逐步加大， 最强奏的地方， 真是光辉灿烂， 爆得七彩 ！）只要低音音符在90Hz 以上， LS3/5a 的能耐， 绝对令太多人跌眼镜。当然您就不好用飞碟的阿姐鼓来评价 LS3/5a 的能耐。

发挥好LS3/5a 决对是一位成熟的烧友， 必须经过的少林寺木人巷。 闯不过木人巷的， 没有牌照{:soso_e120:}

配合的扩音机， 50W的高质量推挽扩音机是非常恰当的。 （这差不多可以用尽LS3/5a 的潜能）， 不用与我说300B， 根本是浪费时间废话。 不过这高质量的推挽机， 选择可不容易。

子弹飞

红山老猫2012 发表于 2013-2-6 15:10
子弹版主好，

您的列出的那副 LS3/5a 的样板 （Prototype） 是不对的， 真正的Prototype是当年， 刊登在 ...

LS35A只有一种款，您说的杂志是哪年的？我帮您找找。

子弹飞

红山老猫2012 发表于 2013-2-6 15:10
子弹版主好，

您的列出的那副 LS3/5a 的样板 （Prototype） 是不对的， 真正的Prototype是当年， 刊登在 ...

您有朋友收藏LS35A，他手中最早的是什么版本？

uvd

红山老猫2012 发表于 2013-2-6 15:10
子弹版主好，

您的列出的那副 LS3/5a 的样板 （Prototype） 是不对的， 真正的Prototype是当年， 刊登在 ...

红山老猫2012，高人也！！！[s:20]