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音箱箱體設計漫話 [复制链接]

41#

頭兩個小節已經夠吸引了 - 平衡 有形 完美勻稱

頭兩個小節,第一小提,Mozart 將A大調大三和弦倒過來并在#c1與a之間加入b: e1 #c1 b a

e1→b 純四度音程,這b令第一主題傾訴更吸引更煽情。

頭兩個小節

第一小提琴: e1   #c1   b   a

第二小提琴: #c1   a   d   #c

中 提 琴: #C   E   #G   A

大 提 琴: a   #c   e   #f


值得考究的是中提琴發音比大提琴低六度,why ?
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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42#

天下皆知美之爲美 斯惡矣 皆知善之爲善 斯不善矣 故有無相生 難易相成 長短相較 高下相盈 音聲相和 前後相隨 恒也



Johannes Brahms Symphonies No.2 in D, Op.73

播放一部交響曲,對音箱低頻有甚要求?

扔一堆豆豉出來,靠譜~~~

低音譜號的五組:德國大管、低音大號、定音鼓、大提琴及低音大提琴

五種樂器能發出的最低音:

德國大管 - 大字一組降B1,58.27Hz
低音大號 - 大字一組D1,36.71Hz
定音鼓 - 大字一組B1,61.74Hz
大提琴 - 大字組C,65.41Hz
低音大提琴 - 大字一組E1,41.20Hz

原則要求,音箱低頻響應要達到36.71Hz,方能播好交響曲.

實際情況如何?

藕粗看了下Brahms Op.73的總譜,全曲的最低音出現在第四樂章,低音大號吹出大字一組A1(55Hz).
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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43#

低頻響應-3dB達到55Hz,甚至平直響應達到55Hz,實現這點要求,就算小型書架箱也不是甚么難度。
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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44#

現代交響樂團的倍大最低音可以發出大字一組C1,藕認為音箱設計頻率考慮大字一組已足夠。

88鍵鋼琴大字二組那三個:A2, B2 flat, B2可以忽略~~~

C1, D1 flat, D1, E1 flat, E1, F1, G1 flat, G1, A1 flat, A1, B1 flat, B1.
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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45#

回复 70# 白了头一夜间 的帖子

白兄,公道自在人心。
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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46#

帖子开首那些公式,乃国际电声界无数前辈几十年的心血。是否正确,业界这方面专业人员,主修相关课程时都应该推导过。

刀可救人也可杀人,怎么用,那是另一回事。
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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47#

音箱箱体设计 - 先设置,后计算。

如何设置箱体相关参数,乃成败关键。

至于计算,初中生水平就可以应付,这玩儿也够用了。

3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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48#

原帖由 3l 于 2013-12-15 23:53:00 发表








以一实例说话


Scan-Speak 18W/8545-00

不用藕介绍,这个单元有多少厂家用过,有多少DIY Enthusiasts用过。

这个单元好伺候吗?用过的都知道。

难伺候是为什么?
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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49#





Scan-Speak 18W/8545-00的最新数据
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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50#

Resonance frequency [fs] 28 Hz

Resonance frequency [fs] → 即前面所述的Fo

发达啦,然后掉到28Hz坑里。
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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51#



1994年收到第一代8545资料並试听样品
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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52#

Recommended enclosure colsed  7.5 - 12.5 l

Recommended enclosure reflex  7.0 - 15.0 l

什么叫舍得?

舍的是什么? 得的是什么?
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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53#

原帖由 3l 于 2013-11-28 16:20:00 发表
基本选择沉默,偶尔抽天才大师一下。


音乐需要连贯的、流畅的低频响应

选择沉默,不再啰嗦。
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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54#

原帖由 3l 于 2013-12-19 11:53:00 发表
原帖由 3l 于 2013-11-28 16:20:00 发表
基本选择沉默,偶尔抽天才大师一下。


音乐需要连贯的、流畅的低频响应

选择沉默,不再啰嗦。

不再啰嗦经典理论,继续吹K.581

有四個可以設定的頻率:

上部附加聲管的諧振頻率Fb1,下部附加聲管的諧振頻率Fb2 ,下部聲箱諧振頻率Fc2,上部聲箱諧振頻率Fc1.
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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55#

有興趣的找架鋼琴彈這三組:

①. e1 #c1 b a

②. b
B1 G1 F1 bE1

③.
B1 #G1 #F1 E1
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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56#

将和弦融入箱体设计。
全世界已出版的书刊,有否此内容?找到请告知藕。
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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57#


这对箱在温哥华小有名气
3L设计, Frabrique au Canada.
http://www.3l-audio.com/bbs/read.php?tid=574
藕不可能办签证,买往返机票到温哥华调试。箱体,分频均为精准计算,一次完成。
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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58#

原帖由 3l 于 2013-12-21 13:13:00 发表
有興趣的找架鋼琴彈這三組:

①. e1 #c1 b a

②. b
B1 G1 F1 bE1

③.
B1 #G1 #F1 E1

明白的知道,十二调可以随便转。
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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59#

那些公式,对从事R&D的人来说只是常识。
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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60#



式子里的1.463Rv叫管口修正数,单管与多管的管口修正数不一样。
3L-Audio Studio, established since 1993, has been dedicated to Hi-Fi audio R&D for over 20 years.
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