LspCAD 5.25 是一款优秀的用于测量扬声器参数及制作高保真音箱的 CAD 软件
配合 Speaker WorkShop 1.06 ,你也能成为 HI-HF 高手:victory: 用透一个工具就够了比如lspcad，不过我还是要见异思迁，转向lsp lab + leap :lol 谢谢楼主。最后4- Close the program and run the update.不知道要运行这个来干嘛 原帖由 大航海 于 2008-7-2 11:21 发表 http://bbs.hifidiy.net/images/common/back.gif
谢谢楼主。最后4- Close the program and run the update.不知道要运行这个来干嘛
升级么 1楼的好象还正常 原帖由 blue7 于 2008-7-2 10:50 发表 http://bbs.hifidiy.net/images/common/back.gif
晕~~,上面这个指南已经足够好了~~~~:lol
我不用写了~~~~;P
写一写个人独特的使用感受也好啊:victory: 原帖由 lltnt 于 2008-7-2 17:47 发表 http://bbs.hifidiy.net/images/common/back.gif
写一写个人独特的使用感受也好啊:victory:
:L 我这是最基础的使用了..............:Q LSPLAB的强处在于测量部份的功能，
ＬＳＰＣＡＤ强的是分频的模拟精度，以及效率．
ＬＥＡＰ最强的还是箱体部份设计，分频模拟部份功能也很强．适用性广，但精确值不见得有ＬＳＰＣＡＤ好．且操作麻烦．
还有ＢＡＳＳＢＯＸ作为一个初级箱体设计也是很实用．还有好多软件．以及包括扬声器设计的．
回复 #8 blue7 的帖子
还是瀑布图看这直观啊。 支持分享:) :victory: :2fsfsf :2fsfsf SPL WiringPreviousTopNext
For SPL measurements do you need a microphone and a microphone amplifier, on fig. 1 do you see an inexpensive setup with a Behringer UB802 6 channel mixer and a Behringer ECM8000 measurement microphone. This setup is working very good for most people but there are other solutions for those who want to make measurements at higher SPL or higher frequency's. If you're interested in making high quality measurements is Earthworks Audio Products offering a couple of microphones.
Behringer can be found here http://www.behringer.com/
and Earthworks is found here http://www.earthworksaudio.com/
mk:@MSITStore:C:\Program%20Files\LoudSpeaker%20LAB%203\LSPLAB3.CHM::/BehringerMixerMic.png
Fig. 1 - Behringer UB802 mixer and a Behringer ECM8000 microphone.
The microphone amplifier/mixer output is connected to left in on your soundcard and the signal you feed the amplifier with is connected to the right in on your soundcard (see fig. 2 below). With this setup should Dual Channel FFT be enabled and the phase response will be absolute. Remember to enter the microphone amplifier gain in the levels dialog and your SPL readings will be absolute if you have made a system calibration.
mk:@MSITStore:C:\Program%20Files\LoudSpeaker%20LAB%203\LSPLAB3.CHM::/simple_probe_connection.png
Fig. 2 - How to connect the wires for SPL measurement.
If you already have the Measurement Box v3 do you connect the output signal to the Ch. 2 input and you're ready to use Dual Channel FFT formerly called probe compensation. If you have calibrated the system do you have to enter the gain for the microphone amplifier and this is 50 dBg when the attenuation is set to 0 dB.
Notes
·The microphone doesn't have a perfectly linear response so you should compensate for this, see Measurement->Settings->Microphone.
·Any unused inputs on a mixer should be turned down since the noise will be added to the output signal from the mixer.
Electrical Measurements
When you're doing electrical measurements is it important to keep the levels going to the soundcard inputs below 2 Volts rms or it will distort the signal or the soundcard could be broken. This is accomplished with a good pre-amplifier or just two resistors connected as a voltage divider. When Dual Channel FFT is used is it the difference between the channels that is measured, this is quite useful when you want to see the response in your circuits. Put the compensation probe at the circuit input and the measurement probe at the circuit output and you will only see the circuit response, otherwise do you connect the compensation probe at the soundcard output and the soundcards own response will be canceled out.
mk:@MSITStore:C:\Program%20Files\LoudSpeaker%20LAB%203\LSPLAB3.CHM::/LineProbe2.png
Fig. 3 - A simple connection with voltage dividers.
Voltage Divider
A voltage divider is composed of two resistors as you can see in fig. 4.
mk:@MSITStore:C:\Program%20Files\LoudSpeaker%20LAB%203\LSPLAB3.CHM::/VoltageDivider.png
Fig. 4 - A simple voltage divider or attenuation circuit.
The formula for the divider ratio is shown below.
mk:@MSITStore:C:\Program%20Files\LoudSpeaker%20LAB%203\LSPLAB3.CHM::/dividerratio.png
And in the example in fig. 3 will give a ratio of 0.04489, this is equal to an attenuation of -26.96 dB which is calculated like this.
mk:@MSITStore:C:\Program%20Files\LoudSpeaker%20LAB%203\LSPLAB3.CHM::/attenuation_formula.png , dB
Note
The input impedance will affect the value of R2 so if you're doing a high impedance attenuation circuit should you calculate the parallel circuit of the R2 and the input impedance and use this value instead in the Ratio formula above.
这套东西我都是有的，调音台今年刚买的；可惜百灵达的话筒－－前年曾经用过很好。但是从去年开始，不同时期买了3支。竟然频响高端都严重崎变。－－注意是严重崎变，完全不能使用；害的我差点砸了2千多的声卡。真不知道怎么QC的。－－倒是三只都是完全一样的崎变（这个QC赞叹不已），不知道是否百灵达要特意给话筒加上校正网络？后面证明那个声卡花房频响没有问题。
有一个我还拆烂了，退都退不掉。:'( :'( 只能拿它当裸话筒来用了。更省了幻想电源了。
其实如果直接用专业线路，好像线路反而不复杂。
如果用论坛的套件倒是要转换下了。
班门弄斧，菜鸟之见。
请LZ和维大等大侠来指导下。
资料都来自于软件帮助文件，1。7m大小。图片很好看，就是文字好像不是普通话，不知道哪里方言。:Q 好想找不到下载。那个热心人能给发一份么？yuayuayu@126.com 貌似第一次看见了比较干净的相位曲线.........
原帖由 blue7 于 2008-7-3 23:56 发表 http://bbs.hifidiy.net/images/common/back.gif
貌似第一次看见了比较干净的相位曲线.........
457776
LZ DX，你好。
上图的相位曲线如果再调整一些度数就标准了。
想请教您的软件使用的外部电路接法，谢谢。 原帖由 alonelie 于 2008-7-4 00:10 发表 http://bbs.hifidiy.net/images/common/back.gif
LZ DX，你好。
上图的相位曲线如果再调整一些度数就标准了。
想请教您的软件使用的外部电路接法，谢谢。
因为我做的是有源箱子,没办法接喇叭的回路回去,只能用声卡一个声道作回路.....有空我还要拆开来,把测试头直接夹到喇叭输出上去才好.