劳驾大虾帮忙计算箱体容积并设计分频器，二分频导向式 [复制链接]

For the sealed box, with the help of the T/S parameter, you can
choose the dimensions of the box to decide the Q of the box.

So, you must get the rest of the parameter to start calculating
the box !!!!!

Why don't you call the manufacturers by phone to ask them.
I am sure they will be happy to tell you or otherwise ask them to
give you their suggested design.

Dangerous to look at the shape of the driver to design the box.
Well otherwise there won't be T/S parameter for the speaker
design.

Speaker box design now mostly based on the T/S parameter
( Thiel & Small ) that some essential data is a must for designing
a speaker box.

It is also true that after calculation, there are so many options for
the designer to determine such as the Q of the box, the
diameter and the length of the vent ( for vented box ) that would
affect the noise level of the air flow.

The calculation would also calculate this air velocity when you
decided the diameter of the duct (vent). Exceeding this limit
will result air flow noise as when the woofer is in action, there
are air flowing in and out the duct, the thinner the duct, the
higher the air velocity.

However, the diameter of the duct is so designed not to exceed
say the velocity of 0.3 Mark  ( Mark is the unit of air velocity) to
be a common practice on speaker design but not look at the
shape of the driver and design.

It's a pity that Boeing cannot provide those T/S parameter to
otherwise it is easy to design a box for him.

Upon finishing the box, then the tweaking come afterward
such as how many cotton fibre to put into the box will take time
to experiment. The caps and the coil of the crossover can also
be the parts to be try and error.

Boeing, I can tell you there will be a lot hard work if you went
wrong at the first place.

So don't listen to some people said look at the cone, look at
the voice coil then design your bos.

If so, please ask them how to start????

Hi Boing,

Give me more detail parameter such as the diameter of the
woofer and others, Qms, Qes, and will give you the box design
and x'over design.

boeing 在 2004-3-22 12:47:00 发表的内容 回开心果： 我想我的动手能力还是可以的，从CD机到音箱包括线材我都曾经自治过。我是学航空机械的，电子方面很多都是知道的比较肤浅，但我想你把大致的方法告诉我还是差不多的。 仪器和工具我们单位有一部分，估计信号发生器不易搞定不知道能否借到。但我还是想知道具体的测试方法的。一起只是听说自己可以测量. 回madog： 我现在只能知道上面附图的一些参数，其他要问厂家，很困难。 Qms是等效震动质量吗？Qes是什么？不好意思：（ 以前似乎见过这两个参数，但三年多没玩了，已经忘的差不多了。 多谢了：）

Qms is the mechanical Q of the driver
Qes is the electrical Q of the driver
Qts is the total Qof Qms and Qes.

There are other T/S ( Theil and Small ) parameters which is necessary to
calculate the box volume. Others are,

Fs  Resonance frequency of the driver in free air
Re DC resistance of voice coil
Le  Inductance of the voice coil ( usually at 1K Hz )
Z   Impedance of the driver
Sd  Volume of the cone
Dia  Diameter of the cone

If you could provide these parameters, then I can calculate the box
volume both in vented box and sealed box and of course x'over.

Look at the information on you post, the best crossover frequency is at
2.2k Hz to avoid the peak from the woofer and the roll off of the tweeter.

You can call the manufacturer to ask for those parameter and I think it is
silly not to supply these data to user as this doesn't make sense or
insufficient to design a box. They should know it.

boeing 在 2004-3-24 16:22:46 发表的内容 madog： 好消息：我们单位有秀发级发动机电器附件的测量工具设备，今天看了一下估计可以测量喇叭。今晚去货运公司取喇叭。 根据你的指导，我必须弄到下面的9个参数，其中一部分我已经知道（厂家提供，即图上可以看到的几个，另外的我要问厂家或自己实际测量），但有几个不确认我的理解是否正确，劳驾仔细帮我察看我的理解是否正确： 1．机械Q值Qms 2．电Q值Qes 3．总Q值Qts:0.32 4. 自由谐振频率FS ：40Hz (就是Fo吧？)？？？？？ 5．直流电阻Re：明天测量 6．音圈电感：明天实测（以1000Hz正弦波测量？？？） 7．阻抗Z 欧姆（就是额定阻抗吧？）？？？？ 8．振膜有效面积（是面积还是锥形振膜的体积？）Sd：询问厂家？？？ 9．有效振动直径Dia(Din？)？？？ 非常感谢！！！ 

Yeah, you've got it all right. I'll wait for your information.

Let me remind you, I had try to find your topic for the last 2 day but could
not find it. I will send anothe mail to you telling you my mail box.

If you don't hear from me after you've given me the parameters, then you
email me me and let me know.

Cheers

boeing 在 2004-3-24 16:22:46 发表的内容 madog： 好消息：我们单位有秀发级发动机电器附件的测量工具设备，今天看了一下估计可以测量喇叭。今晚去货运公司取喇叭。 根据你的指导，我必须弄到下面的9个参数，其中一部分我已经知道（厂家提供，即图上可以看到的几个，另外的我要问厂家或自己实际测量），但有几个不确认我的理解是否正确，劳驾仔细帮我察看我的理解是否正确： 1．机械Q值Qms 2．电Q值Qes 3．总Q值Qts:0.32 4. 自由谐振频率FS ：40Hz (就是Fo吧？)？？？？？ 5．直流电阻Re：明天测量 6．音圈电感：明天实测（以1000Hz正弦波测量？？？） 7．阻抗Z 欧姆（就是额定阻抗吧？）？？？？ 8．振膜有效面积（是面积还是锥形振膜的体积？）Sd：询问厂家？？？ 9．有效振动直径Dia(Din？)？？？ 非常感谢！！！ 

Yeah buddy, you've got it right. I am waiting for your informations.

As I'd been browsing this topic for the last 2 day to see your response but
I can't find it up to 20 pages.

So in this case I will send you personal mail telling you my email box in the case I cannot find this topic again.

That means if you don't get my response after your informatin after 2 days,
you'd better write to my mail box.

Cheers