Stereo / Mono / Distributed Systems: Difference between revisions

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<~~table><tr~~>

<~~td valign="top" width="300"~~>__TOC__</td>

<~~td valign="top"~~>This article applies to using multiple {{L1}}s in various ways: Stereo, Mono, Distributed Systems.

<div><h2>Introduction</h2>

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This article applies to using multiple {{L1}}s in various ways: Stereo, Mono, Distributed Systems.

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* It's a mistake to place stereo speakers too closely together. Not only does the area over which listeners hear stereo sound shrink but you can get undesirable interference effects caused when the same (or very nearly the same) signal is played simultaneously through two or more like speakers. (Multi-source interference can cause audible dropouts in tone.)

* For these reasons, I'd recommend spacing L1 systems used for stereo at least 10' apart. There's competing interests here. A player located too close to one of the L1 systems spaced too far apart won't hear stereo — but his or her audience will. On the other hand, space the L1 systems closer so that the player gets stereo and you won't project stereo to the audience.

* For these reasons, I'd recommend spacing L1 systems used for stereo at least 10' apart. There are competing interests here. A player located too close to one of the L1 systems spaced too far apart won't hear stereo — but his or her audience will. On the other hand, space the L1 systems closer so that the player gets stereo and you won't project stereo to the audience.

* A player located roughly between two spaced L1 systems will hear stereo well and many in the audience will too. 10-20' feels good to me for this kind of setup although I don't want to have this come across as more than a rule of thumb.

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==== Two ~~L1®s~~ in Mono ====

==== Two {{L1}}s in Mono ====

How much gain do you get when you run two L1® with the same source.

:The most you can ~~ever~~ ever get from putting two sources fed by the same signal together is 6 dB. The reason? sound waves add in space through the principle of superposition. If the waves from two sources perfectly add, you get twice the amplitude, which is 6 dB. Now, I've been proven wrong on a number of occasions, but if that happens on this occasion, Alan, the sound engineer you've been talking to is going to get a Nobel Prize.

:The most you can ever get from putting two sources fed by the same signal together is 6 dB. The reason? sound waves add in space through the principle of superposition. If the waves from two sources perfectly add, you get twice the amplitude, which is 6 dB. Now, I've been proven wrong on a number of occasions, but if that happens on this occasion, Alan, the sound engineer you've been talking to is going to get a Nobel Prize.

:The problem is that to get the full 6 dB the two sources have to be spaced very closely together relative to a wavelength of sound. at 50 Hz, where the wavelength of sound is about 20' (about 7 meters) that's pretty easy to do. Massing your B1 bass modules is done for this reason -- to get the 6 dB per doubling of B1 systems. But at 1,000 Hz, where the wavelengths are 1' (about 30 cm) you just can't do get L1 speakers close enough. As a result, you get something less than 6 dB because at some angles instead of the sound waves constructively adding they will destructively cancel (one will be partly or completely out of phase with the other.

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-<table><tr>
+<div class="tocdiv">
-<td valign="top" width="300">__TOC__</td>
+    <div>__TOC__</div>
-<td valign="top">This article applies to using multiple {{L1}}s in various ways: Stereo, Mono, Distributed Systems.
+    <div><h2>Introduction</h2>
-</td>
+This article applies to using multiple {{L1}}s in various ways: Stereo, Mono, Distributed Systems.
-</tr></table>
+    </div>
+</div>
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 * It's a mistake to place stereo speakers too closely together. Not only does the area over which listeners hear stereo sound shrink but you can get undesirable interference effects caused when the same (or very nearly the same) signal is played simultaneously through two or more like speakers. (Multi-source interference can cause audible dropouts in tone.)
-* For these reasons, I'd recommend spacing L1 systems used for stereo at least 10' apart. There's competing interests here. A player located too close to one of the L1 systems spaced too far apart won't hear stereo &mdash;  but his or her audience will. On the other hand, space the L1 systems closer so that the player gets stereo and you won't project stereo to the audience.
+* For these reasons, I'd recommend spacing L1 systems used for stereo at least 10' apart. There are competing interests here. A player located too close to one of the L1 systems spaced too far apart won't hear stereo &mdash;  but his or her audience will. On the other hand, space the L1 systems closer so that the player gets stereo and you won't project stereo to the audience.
 * A player located roughly between two spaced L1 systems will hear stereo well and many in the audience will too. 10-20' feels good to me for this kind of setup although I don't want to have this come across as more than a rule of thumb.
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-==== Two L1®s in Mono ====
+==== Two {{L1}}s in Mono ====
 How much gain do you get when you run two L1® with the same source.
 <!--This is an excerpt from a recent post from Ken-at-Bose. He will be updating this soon. -->
-:The most you can ever ever get from putting two sources fed by the same signal together is 6 dB. The reason? sound waves add in space through the principle of superposition. If the waves from two sources perfectly add, you get twice the amplitude, which is 6 dB. Now, I've been proven wrong on a number of occasions, but if that happens on this occasion, Alan, the sound engineer you've been talking to is going to get a Nobel Prize.
+:The most you can ever get from putting two sources fed by the same signal together is 6 dB. The reason? sound waves add in space through the principle of superposition. If the waves from two sources perfectly add, you get twice the amplitude, which is 6 dB. Now, I've been proven wrong on a number of occasions, but if that happens on this occasion, Alan, the sound engineer you've been talking to is going to get a Nobel Prize.
 :The problem is that to get the full 6 dB the two sources have to be spaced very closely together relative to a wavelength of sound. at 50 Hz, where the wavelength of sound is about 20' (about 7 meters) that's pretty easy to do. Massing your B1 bass modules is done for this reason -- to get the 6 dB per doubling of B1 systems. But at 1,000 Hz, where the wavelengths are 1' (about 30 cm) you just can't do get L1 speakers close enough. As a result, you get something less than 6 dB because at some angles instead of the sound waves constructively adding they will destructively cancel (one will be partly or completely out of phase with the other.