Template:Two L1 Systems: Difference between revisions

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;Introduction

: This discussion pertains to using two {{L1}} systems with the same sound source ([[:Dual Mono]]). For a discussion about stereo see [[Stereo / Mono / Distributed Systems]]

;What is the benefit of using two {{L1}} systems over one?

: You will get more coverage (based on the distance between the {{L1}} systems) and an increase in loudness (but not double the loudness)<ref name=loudness>[http://www.sengpielaudio.com/calculator-levelchange.htm Loudness level gain volume perception dB factor volume conversion ...]</ref> .

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; How much gain do you get when you run two {{L1}} systems with the same source?

: Short answer +3 dB

: Short answer: +3 dB in practice

; +6 dB in theory

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* Sound waves add in space through the principle of [https://www.acs.psu.edu/drussell/demos/superposition/superposition.html superposition]. If the waves from two sources perfectly add, you get twice the amplitude, which is +6 dB.

* 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 12 inches (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).

* 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 bass modules is done for this reason -- to get the 6 dB per doubling of bass module systems. But at 1,000 Hz, where the wavelengths are 12 inches (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).

; +3 dB in practice

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; Is +3 dB twice as loud?

: No

*Doubling the power (+3 dB)is '''not''' twice as loud.

*A non-exact rule-of-thumb is that every 10 dB increase is a doubling of perceived loudness. <ref name=loudness></ref>

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+{{Model II icon}}{{Model 1S icon}}{{Compact icon}}{{L1 Pro icon}}
 <div style="max-width:800px">
+;Introduction
+: This discussion pertains to using two {{L1}} systems with the same sound source ([[:Dual Mono]]). For a discussion about stereo see  [[Stereo / Mono / Distributed Systems]]
 ;What is the benefit of using two {{L1}} systems over one?
 : You will get more coverage (based on the distance between the {{L1}} systems) and an increase in loudness (but not double the loudness)<ref name=loudness>[http://www.sengpielaudio.com/calculator-levelchange.htm Loudness level gain volume perception dB factor volume conversion ...]</ref> .
@@ Line 7: / Line 11: @@
 ; How much gain do you get when you run two {{L1}} systems with the same source?
-: Short answer +3 dB
+: Short answer: +3 dB in practice
 ; +6 dB in theory
@@ Line 13: / Line 17: @@
 * Sound waves add in space through the principle of [https://www.acs.psu.edu/drussell/demos/superposition/superposition.html superposition]. If the waves from two sources perfectly add, you get twice the amplitude, which is +6 dB.
-* 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 12 inches (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).
+* 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 bass modules is done for this reason -- to get the 6 dB per doubling of bass module systems. But at 1,000 Hz, where the wavelengths are 12 inches (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).
 ; +3 dB in practice
@@ Line 20: / Line 24: @@
 ; Is +3 dB twice as loud?
 : No
-*Doubling the power (+3 dB)is '''not''' twice as loud.
+*Doubling the power (+3 dB)is  '''not'''  twice as loud.
 *A non-exact rule-of-thumb is that every 10 dB increase is a doubling of perceived loudness. <ref name=loudness></ref>