![]() ![]() For example, sibilants like cymbals are localized higher than low-frequency sounds such as a bass guitar, which creates a perception of height. That said, height is created by frequency or the sound's pitch in relation to other sounds in your mix. However, note that we don't currently test for height or depth when evaluating a speaker's soundstage and it's a limitation of our testing at the moment. In addition to width, there are two other components of a 3D sound, height and depth, which also play a role in creating an immersive soundstage. You may even want your speaker to play mono signals if the original track was recorded in mono, like AM radio or older albums. ![]() They play the same mono signal from both the left and right speakers, which creates a phantom mono sound source. Mono speakers don't create a very immersive soundstage, as the objects they produce are two-dimensional and lack width. That said, stereo speakers can still play mono content. When it receives a stereo signal, it has to downmix it into mono to play it. Speakers like the Amazon Echo Dot Gen 4 are mono speakers, so they only have one channel to playback audio. This can help its soundstage seem wide and accurate. For example, if you're streaming video with your speaker, someone can speak on the left-hand side of your screen, and the stereo speaker can then localize that voice so that you perceive it as coming from your left. These two channels play stereo signals to help create the impression that sound is coming from localized areas rather than from the front of the speaker. To play stereo signals, speakers like the DOSS SoundBox Plus or Sonos Five have to have separate left and right channels. We also use a test signal to see whether the speaker can play the left channel and then use a different test signal to see if it can play the right channel. We test whether a speaker is mono or stereo by checking the user specifications or tech drawings. Mono signals contain a single audio channel, while stereo signals contain two channels, left and right, which sound somewhat different from each other. This refers to whether it can play either monophonic (mono) or stereophonic (stereo) signals. ![]() If you like to listen to music from your speaker, you'll want to know whether your speaker is mono or stereo. In short, the smaller the directivity index or the flatter the graphed responses, the better a speaker's directivity. The red line indicates the average difference. Each thin line corresponds to a different degree and is the difference between the 0-degree frequency response and the corresponding angle. In the graph, the 0 line is the flattened frequency response at 0 degrees. We play an audio file to measure its frequency response and turn the table to seven different angles (0, 30, 60, 90, 120, 150, and 180) while recording each pass. ![]() To test a speaker's directivity, we place it on a moveable table one meter away from our mic setup. This index measures in decibels how directional a speaker's pattern is, and how narrow or wide the soundstage seems. A 360-degree speaker can help create a wider soundstage while ensuring that your audio sounds clear from all angles. We measure a speaker's performance at different angles using the directivity index. There are two general designs: a front-facing speaker that plays audio in one general direction, and an omnidirectional (or 360-degree) speaker, which plays audio in all directions. Speakers come in lots of different shapes and sizes, which can impact its soundstage. #Speak unit test BluetoothFinally, we also run this test using the speaker's battery, if applicable, and pair the speaker to our test phone via Bluetooth or Wi-Fi. We also check that the speaker is placed at an equal distance to all of the table's sides. Using a laser measuring tool, we ensure that the microphone array, table, and speaker are all at equal distance from the side walls. The speaker is placed one meter away from the tip of the central microphone. There's one couch, and there's minimal acoustic treatment. Our soundstage test is conducted at the same time as the frequency response and dynamics tests. It also indicates if the audio sounds clear at different angles or if there's deviation, which could make it harder for you to hear your audio if the speaker is turned a certain way. These two components can tell us how wide and natural the soundstage seems. To measure a speaker's soundstage, we measure its directivity index and whether it's a stereo or mono speaker. ![]()
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