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For a good working Sound System it is essential that all loudspeakers are wired correctly.

With this app you can check the "polarity" of a speaker, whether it first moves forwards or backwards (often mistakenly named "phase", which is also time and frequency related).

A loudspeaker should have the same polarity as it's "friend on the other side" when measured at the same position/distance. This also counts for multiple speakers which should be doing the same (a cluster of multiple subwoofers for instance).

Important notes:

 - Red is NOT bad!! A lot of filter-designs that drive loudspeakers have out of polarity components (so for instance the high frequency speaker CAN be opposite polarity to the low frequency speaker).

 - Try to measure as close to the speaker as possible (and away from bass-ports).

 - dBFS means "Decibels relative to full scale". So 0dBFS is the maximum soundpressure your device is capable of handling without distorting (clipping).

 - Using a different pulse signal CAN give opposite readings, due to loudspeaker filter designs. Use the same pulse when comparing!

Polarity Checker can be useful for testing almost all sound sources. Like large scale concert PA systems, home theater systems, studio monitors, car audio en even headphones..

Usage:

For playing the pulse signal you have 3 options:

 - Use a wire to connect your phone/tablet to the Sound System.

 - Use 2 phones/tablets (one wired for pulse generation and one without wires for measuring).

 - Copy the pulse files (which can be found in sd-card/PolarityChecker) to a playback medium (cd/iPod) that is able to repeat single tracks. 

 - When the polarity-reverse button "Ø" is pressed (red), the pulse generator plays a negative pulse. So the measurement should give opposite readings! (equal to playing an INVERTED_pulseXXXX.mp3 file)

Measuring:

 - Avoid CLIPPING the microphone, this could corrupt the measurement.

 - Adjust the threshold, so the checker doesn't get triggered by background noise.

 - Try to measure one speaker at a time. If possible mute all other sound sources.

When measuring "passive filtered" speaker cabinets (for instance when you've got one amplifier driving your low and high speaker at the same time), it can be useful to select a frequency dependent pulse to isolate the speaker you want to measure.

If you like this app, please comment and rate. If you've got any questions, bugs or feature requests, please visit the facebook page:http://www.facebook.com/PolarityCheckerPERMISSIONS USED:

 - RECORD_AUDIO: To use the mic input of the device

 - STORAGE: Needed to copy the pulse files to the sdcard

 - FULL INTERNET ACCESS: Needed for Ads (not used when donation key is purchased)

 - VIEW NETWORK STATE: Needed for Ads (not used when donation key is purchased)

Search tags: popper, pop, plopper, sine, inwards, outwards, cancellation, stereo, positive, negative, reverse有良好的工作音响系统至关重要的是，所有的扬声器接线正确。

有了这个程序，您可以检查“极性”的扬声器，无论是第一次向前移动或向后（经常被错误地命名为“相”，这也是时间和频率有关）。

一种扬声器，应该具有相同的极性，因为它是“朋友的另一侧”测量时，在相同的位置/距离。这也被计算为多个扬声器应该做的是相同的（例如集群的多个低音炮）。

重要注意事项：

  - 红不坏！很多的过滤器设计，驱动扬声器，满分的极性组分（例如，高频扬声器CAN​​是极性相反的低频扬声器）。

  - 尝试的扬声器尽可能靠近（从低音端口），来衡量。

  -  dBFS的意思是“分贝相对于满量程”。所以，0dBFS是的最大soundpressure你的设备是能够处理不扭曲（裁剪）。

  - 使用不同的脉冲信号，可以给对面的读数，由于扬声器滤波器的设计。使用相同的脉冲进行比较时！

极性检查测试几乎所有的声源可能是有用的。如大型演唱会PA系统，家庭影院系统，录音室监听，甚至耳机，汽车音响的连接..

用途：

打脉冲信号，你有3种选择：

  - 用线连接您的手机/平板电脑的音效系统。

  - 使用手机/平板电脑（一个脉冲的产生和有线一个没有电线进行测量）。

  - 脉冲复制文件（，可以发现在sd-card/PolarityChecker的）重放介质（坎德拉/ iPod）的，是能够重复单一轨迹。

  - 当“Ø”的极性反向的按钮被按下时（红色），该脉冲发生器起着一个负脉冲。因此，测量应该给对面的读数！ （等于发挥了INVERTED_pulseXXXX.mp3文件）

测量：

  - 避免削波的麦克风，这可能会破坏测量。

  - 调整阈值，使检查不被触发的背景噪音。

  - 一次尝试衡量一个扬声器。如果可能的话静音所有其他声源。

当测量的“被动过滤”音箱（例如，当你有一个放大器驱动的低和高的扬声器在同一时间），也可以是有用的选择依赖于频率的脉冲隔离要测量的扬声器。

如果你喜欢这个程序，请评论和速度。如果你有任何问题，错误或功能请求，请访问Facebook页面：http://www.facebook.com/PolarityChecker使用权限，

  -  RECORD_AUDIO：要使用的设备的麦克风输入

  - 存储：需要的脉冲文件复制到SD卡

  - 完全的Internet访问所需的广告（不使用购买捐赠键时）

  - 查看网络状态所需要的广告（不使用购买捐赠键时）

搜索标签：波普尔，流行，plopper，正弦，向内，向外，取消的，立体的，积极的，消极的，反

Polarity Checker

Polarity Checker的最新版本