Making phase adjustments must be approached with the understanding it can do as much harm as good. A good example of a popular use for phase is the phaser effect. I'll also add that while the concepts I am discussing here are from the practical (i.e. While it is recommended to always wire speakers correctly, the effects of incorrect wiring vary depending on the situation. Connect the black (or -) terminal on the amplifier to the black (or -) terminal on the speaker. Sign up here to receive updates on new content posted by Audio University. Go to the ‘Dynamic Microphones’ section of that article to see a more detailed description of this concept. You will end up with the difference between the two, allowing you to hear exactly how your original audio was changed. We have two ears, and so as with a multi-microphone recording setup, our ears pick up sound at different points in time. Any changes in polarity are almost always made in an audio console or amplifier DSP, rather than in the wiring of speaker terminals. Instead of teaching you the solution to every possible situation, Audio University will equip you with a foundational understanding of audio, giving you the power to overcome whatever obstacles you'll encounter. This downward motion of the drum head creates a negative change in pressure. That is, d = φ / 360° × λ, where d is delay and λ is wavelength. recording, mixing and mastering) viewpoint, another viewpoint is mathematical. In the video at the top of this page, there are audio demonstrations of this scenario. For those who are science buffs, you might imagine positive versus negative polarity being almost like matter and antimatter. The end result is a waveform that is of higher amplitude (i.e. When you reverse the polarity of complex waveform A, you change the phase of all its frequency elements equally, by 180°. In contrast, when we reverse the polarity of a complex waveform, the phase of every single frequency component is changed by 180°. I wrote this article about it that will help you to see why it’s really important to understand the difference. The tone is different too though, so it is best to listen with and without the polarity reversed, and with each mic at different gain levels before you commit to one mode or the other. 1. Using phase, you can take advantage of how we perceive sound by adjusting or even exaggerating the time differences between the left and right channels in your mix. Watch this video to see it in action. The 200Hz part is delayed by 180°, as we would expect; but the 400Hz component is delayed by 360°, not 180°; and the 600Hz component is delayed by 540°, which is 180° + 360°. If this concept doesn’t make sense, you’ll want to check out this article that explains how sound travels through space. The phase control operates over a range of 0 to 180 degrees. When the wires from the amplifier to the speaker are crossed, the speaker polarity will be inverted. As a result, the 200Hz element in the mix will again get louder, but the 400Hz element will keep the same volume. The short answer: Mono audio signals contain one channel. Phase, refers to a waveform’s position in degrees of a cycle, or time, relative to another waveform. Place the other speaker wire to the negative (-) terminal of the battery. The best way to become powerful in the professional audio industry is to learn the basics. Again, the movement in time changes the phase of each frequency relative to the waveforms in your mix to varying degrees (more about this down below). These next two waveforms are also identical, but this time waveform 2 has been phase-shifted 180 degrees (i.e. However, what if one speaker is wired in the correct polarity and the other is reversed? For this reason, it is a good idea to check your mix in mono as you work. They are perfectly in phase with each other are both of positive polarity. What happens if speakers are connected backwards? But how much delay is 180°? They will shift the mics here and there so that 1) they get the best tone, but 2) so that the two mics interact well together, in mono and stereo (think "phase relationships"). The result is silence. A waveform’s phase is 0 until you move it forward or backward from its position. This speaker tester is relatively inexpensive and will not only allow you to test speaker polarity, but it also has a signal generator. Phase shifting and polarity reversal are two tools that recording and mix engineers use regularly. The concept behind a balanced cable is that both positive and negative polarity versions of the audio are sent down the cable.