1、车载有源低音炮电路图车载有源低音炮电路图车载有源低音炮电路图 时下低音炮、超低音箱十分流行，但车用有源低音炮却很少有介绍。本人单位有辆丰田面包车，车上有录音机音质不错。但低音明显不足，为此加了一个有源低音炮，效果比较理想，现介绍如下。找一段内径170MM左右，长1.5M的厚低管，如能找到类似的硬塑料管则更好。找一段硬木头，在车床上加工成如图9-46中间固定扬声器的那一段，其外径一定要同纸管内径一致，以方便扬声器的固定，并在其外圆上开一走线槽，将扬声器固定在木头上，在木头上刷上胶，将其固定在导管中央，扬声器选用两只8欧6.5英寸低音反相并联。功放采用TDA2005M，拼成BTL形式，如图9-47
2、所示。这是车用电源所能提供较大输出音频功率的电路形式，尽管对超低音来讲，其输出功率有些不够，但在实际使用中，效果相当满意了。 使用时将低音炮旋转在车后座下，低音信号可直接从扬声器上拾取，注意相位不要接错。此低音炮如能配置50W以上超低音功放、用于家庭影院系统，其效果也较好。 school), 4 4 house building as well as more than 1000 copies of books, more than 10 kinds of collection of newspapers and magazines, fires burnt down. In 1938, th
3、e Japanese learned that the national Government established in XI Tang Tomb rotten clip taxes, tax officers live in 8 of Yan Dong village farmers home, troops at night, Yao was burned several houses. 1938 new morning of September 18, the Japanese team went to the countryside sweep from the kaiyang v
4、illage line to Tung Yang Jia Qiao yan Temple wall and met Yang Jia溇 Zhou Dana (male) weeks because of long-term illness and cant work in the fields, the Japanese see his face from scratch without calluses, regard him as Shina, thrust a knife at the scene of his death. The body was stabbed 7 times, w
5、ound 13. The same day, Trang bang village heard the Japanese come to mop-up are hiding, mother of 9 Zhou Guanbao Zhang Aying to drill a dry mound, was discovered by the Japanese, a shot in the end. The same day, is 7 zhouhaijiangzhi grandfather Zhou Yingbao to escape the Japanese army, was found on
6、the road, a shot in the end. In March 1939, the Japanese army in Yan Tomb raiding, has arrested 16 people, in fengqiao cigarettes this morning bang, killing 11 people on the River, East meeting point in wood qiaotu in the afternoon killing 4 people on the Riverside. Gu Tong is a Japanese go speak th
7、e Shanghai dialect, later to be called Gu Tong as kill left. On January 18, 1943, the elves, five thousand or six thousand, water and land go hand in hand mop-up jiaxing area west of the railway, Yan Tomb area fall. March 6, Niu Shan (County Government II section chief) carrying its child Niu Jun (s
8、trict Tomb seventh district Chang) and the District Assistant Yu Xuchu, and players Jin Fuqin, and Shen Baosheng, six people received Wujiang underground County Government notification 低成本超重低音炮电路及制作 市售的国产有源超重低音音箱价格一般均在1200元以上，进口的产品售价更是价格不菲、本文向读者介绍一款自制的有源超重低音音箱，输出功率达100W，最低频率响应可达26HZ，制作成本500元左右。 电路原理
9、: school), 4 4 house building as well as more than 1000 copies of books, more than 10 kinds of collection of newspapers and magazines, fires burnt down. In 1938, the Japanese learned that the national Government established in XI Tang Tomb rotten clip taxes, tax officers live in 8 of Yan Dong villag
10、e farmers home, troops at night, Yao was burned several houses. 1938 new morning of September 18, the Japanese team went to the countryside sweep from the kaiyang village line to Tung Yang Jia Qiao yan Temple wall and met Yang Jia溇 Zhou Dana (male) weeks because of long-term illness and cant work in
11、 the fields, the Japanese see his face from scratch without calluses, regard him as Shina, thrust a knife at the scene of his death. The body was stabbed 7 times, wound 13. The same day, Trang bang village heard the Japanese come to mop-up are hiding, mother of 9 Zhou Guanbao Zhang Aying to drill a
12、dry mound, was discovered by the Japanese, a shot in the end. The same day, is 7 zhouhaijiangzhi grandfather Zhou Yingbao to escape the Japanese army, was found on the road, a shot in the end. In March 1939, the Japanese army in Yan Tomb raiding, has arrested 16 people, in fengqiao cigarettes this m
13、orning bang, killing 11 people on the River, East meeting point in wood qiaotu in the afternoon killing 4 people on the Riverside. Gu Tong is a Japanese go speak the Shanghai dialect, later to be called Gu Tong as kill left. On January 18, 1943, the elves, five thousand or six thousand, water and la
14、nd go hand in hand mop-up jiaxing area west of the railway, Yan Tomb area fall. March 6, Niu Shan (County Government II section chief) carrying its child Niu Jun (strict Tomb seventh district Chang) and the District Assistant Yu Xuchu, and players Jin Fuqin, and Shen Baosheng, six people received Wu
15、jiang underground County Government notification 元器件选择与安装: school), 4 4 house building as well as more than 1000 copies of books, more than 10 kinds of collection of newspapers and magazines, fires burnt down. In 1938, the Japanese learned that the national Government established in XI Tang Tomb rot
16、ten clip taxes, tax officers live in 8 of Yan Dong village farmers home, troops at night, Yao was burned several houses. 1938 new morning of September 18, the Japanese team went to the countryside sweep from the kaiyang village line to Tung Yang Jia Qiao yan Temple wall and met Yang Jia溇 Zhou Dana (
17、male) weeks because of long-term illness and cant work in the fields, the Japanese see his face from scratch without calluses, regard him as Shina, thrust a knife at the scene of his death. The body was stabbed 7 times, wound 13. The same day, Trang bang village heard the Japanese come to mop-up are
18、 hiding, mother of 9 Zhou Guanbao Zhang Aying to drill a dry mound, was discovered by the Japanese, a shot in the end. The same day, is 7 zhouhaijiangzhi grandfather Zhou Yingbao to escape the Japanese army, was found on the road, a shot in the end. In March 1939, the Japanese army in Yan Tomb raidi
19、ng, has arrested 16 people, in fengqiao cigarettes this morning bang, killing 11 people on the River, East meeting point in wood qiaotu in the afternoon killing 4 people on the Riverside. Gu Tong is a Japanese go speak the Shanghai dialect, later to be called Gu Tong as kill left. On January 18, 194
20、3, the elves, five thousand or six thousand, water and land go hand in hand mop-up jiaxing area west of the railway, Yan Tomb area fall. March 6, Niu Shan (County Government II section chief) carrying its child Niu Jun (strict Tomb seventh district Chang) and the District Assistant Yu Xuchu, and pla
21、yers Jin Fuqin, and Shen Baosheng, six people received Wujiang underground County Government notification 低音炮音箱设计原理及制作 超重低音音箱，俗称低音炮，大多数牌号以AV功放加五只音箱与低音炮组成套餐形式推销家庭影院产品中，低音炮已经是必不可少的配置了，实际上，设计规范、制作精湛、效果出色的低音炮(其在家庭影院系统音频重放中的效果相当迷人( 本文拟就低音炮的设计原理做简单的介绍，供有兴趣音参考。 一般而言，从低音炮的构成来讲，低音也分有源与无源二大类，所谓有源低音炮指包含功率放大器的低
22、音炮，其中电路部分除功率放大外(通常还具有音频频率滤波(滤去低音以上的音频频率成分)，相位调整。音量调整等单元;而无源低音炮即与一般音箱无二，由单元与无源功率分频器组成，其中分频器是一低通滤波器而已。使其重放频率范围仅为超重低音音频。下面就低音炮的-大单元音箱，功率放大分别做以介绍。 一、低音炮箱体设计原理和分类 就低音炮设计原理，可大致分三大类，即密闭式音箱、倒相式音箱以及带通滤波式音箱 school), 4 4 house building as well as more than 1000 copies of books, more than 10 kinds of collection
23、 of newspapers and magazines, fires burnt down. In 1938, the Japanese learned that the national Government established in XI Tang Tomb rotten clip taxes, tax officers live in 8 of Yan Dong village farmers home, troops at night, Yao was burned several houses. 1938 new morning of September 18, the Jap
24、anese team went to the countryside sweep from the kaiyang village line to Tung Yang Jia Qiao yan Temple wall and met Yang Jia溇 Zhou Dana (male) weeks because of long-term illness and cant work in the fields, the Japanese see his face from scratch without calluses, regard him as Shina, thrust a knife
25、 at the scene of his death. The body was stabbed 7 times, wound 13. The same day, Trang bang village heard the Japanese come to mop-up are hiding, mother of 9 Zhou Guanbao Zhang Aying to drill a dry mound, was discovered by the Japanese, a shot in the end. The same day, is 7 zhouhaijiangzhi grandfat
26、her Zhou Yingbao to escape the Japanese army, was found on the road, a shot in the end. In March 1939, the Japanese army in Yan Tomb raiding, has arrested 16 people, in fengqiao cigarettes this morning bang, killing 11 people on the River, East meeting point in wood qiaotu in the afternoon killing 4
27、 people on the Riverside. Gu Tong is a Japanese go speak the Shanghai dialect, later to be called Gu Tong as kill left. On January 18, 1943, the elves, five thousand or six thousand, water and land go hand in hand mop-up jiaxing area west of the railway, Yan Tomb area fall. March 6, Niu Shan (County
28、 Government II section chief) carrying its child Niu Jun (strict Tomb seventh district Chang) and the District Assistant Yu Xuchu, and players Jin Fuqin, and Shen Baosheng, six people received Wujiang underground County Government notification 1、 密闭式音箱 顾名思义，这种音箱箱体是完全封闭的，与一般的所谓闭箱结构上一样，见图1 密闭式音箱的特点是结构
29、简单，瞬态响应比较好(即听感深沉、清晰。不足是，在相同的体积下，与其它类型的音箱相比，其低频下潜截止频率要高于其他音箱，因此，如果要获得更低的低频下潜频率，通常需要较大的箱体容积并选用口径较大的喇叭单元，而且音箱的效率即灵敏度要低于其他类型音箱。 在箱体容积设计方面，有一个工程设计数据供参考(当喇叭单元的谐振频率Fs低于50Hz时，箱体容积最好能够大于1.4立升。Fs大于50Hz时，箱体容积最好能够大于2立升。 闭箱在制作、调校时通常还需要在箱体内填充大量吸音棉，材料以玻璃纤维，长纤维羊毛为主，能够改善音箱的柔顺性，也可达到等效增加箱体容积的效果，理论上达40%，实用上可以按等效增加容积15%
30、-24%进行计算，相当于减少箱体的容积。另外，填充吸音棉，也可提高音箱的效率，正确的填充量，最大可提高音箱效率达15%，吸音棉的多少通常需要通过反复试听来决定填充量的多少，以声音不浑浊(量偏少)，沉闷(量过多)为原则，其它类型音箱也是如 对于闭箱型低音炮，对单元的要求相对其它类型音箱要严格一些，其中希望Fs以低于40Hz为好，Qts应该在0.3-0.6，Fs/Qts?50。除此之外单元口径最好大于20cm ,而且属于长冲程设讨。 2、倒相式音箱 school), 4 4 house building as well as more than 1000 copies of books, more
31、 than 10 kinds of collection of newspapers and magazines, fires burnt down. In 1938, the Japanese learned that the national Government established in XI Tang Tomb rotten clip taxes, tax officers live in 8 of Yan Dong village farmers home, troops at night, Yao was burned several houses. 1938 new morn
32、ing of September 18, the Japanese team went to the countryside sweep from the kaiyang village line to Tung Yang Jia Qiao yan Temple wall and met Yang Jia溇 Zhou Dana (male) weeks because of long-term illness and cant work in the fields, the Japanese see his face from scratch without calluses, regard him as Shina, thrust a knife at the scene of his death. The body was stabbed 7 times, wound 13. The same day, Trang bang village heard the Japanese come to mop-up are hiding, mother of 9 Zhou Guanbao Zhang Aying to drill a dry mound, was discovered by th
