L1 Loudness Behind - Revision history

ST at 18:14, 20 August 2024

2024-08-20T18:14:24Z

← Older revision		Revision as of 18:14, 20 August 2024
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	*A-weighted and C-weighted (dBA and dBC)		*A-weighted and C-weighted (dBA and dBC)

			;Notes
			:This 3 dB difference was measurable in a free field (no walls). When there are walls, the difference is less apparent due to room reflections.
			:A change of 3 dB is accepted as the smallest difference in level that is easily heard by most listeners listening to speech or music. It is a slight increase or decrease in volume<ref> [https://www.e2s.com/references-and-guidelines/db-decibel-ratings db Decibel Ratings]</ref>.

	==Further reading==		==Further reading==

ST at 18:07, 20 August 2024

2024-08-20T18:07:08Z

← Older revision		Revision as of 18:07, 20 August 2024
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	If you place the L1 beside you, the sound is very little different from directly in front. This is great for monitoring if you are on a shallow stage.		If you place the L1 beside you, the sound is very little different from directly in front. This is great for monitoring if you are on a shallow stage.

	Behind the L1 system, the sound will sound muffled because the mid-high frequencies are more directional than the lows. In testing (below) the difference was about 3 dB SPL (Sound Pressure Level). ~~Note~~: A change of 3 dB is accepted as the smallest difference in level that is easily heard by most listeners listening to speech or music. It is a slight increase or decrease in volume<ref> [https://www.e2s.com/references-and-guidelines/db-decibel-ratings db Decibel Ratings]</ref>.		Behind the L1 system, the sound will sound muffled because the mid-high frequencies are more directional than the lows. In testing (below) the difference was about 3 dB SPL (Sound Pressure Level).
			;Notes
			:This 3 dB difference was measurable in a free field (no walls). When there are walls, the difference is less apparent due to room reflections.
			:A change of 3 dB is accepted as the smallest difference in level that is easily heard by most listeners listening to speech or music. It is a slight increase or decrease in volume<ref> [https://www.e2s.com/references-and-guidelines/db-decibel-ratings db Decibel Ratings]</ref>.

ST at 18:04, 20 August 2024

2024-08-20T18:04:30Z

← Older revision		Revision as of 18:04, 20 August 2024
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	If you find the L1 systems too loud when placed behind you, consider using high-quality hearing protection. Putting them beside or ahead of you will make very little difference for frequencies up to 1000 Hz or the sensation of loudness.		If you find the L1 systems too loud when placed behind you, consider using high-quality hearing protection. Putting them beside or ahead of you will make very little difference for frequencies up to 1000 Hz or the sensation of loudness.

	If you place the L1 beside you,		If you place the L1 beside you, the sound is very little different from directly in front. This is great for monitoring if you are on a shallow stage.

	~~However, behind~~ the L1 system, the sound will sound muffled because the mid-high frequencies are more directional than the lows.		Behind the L1 system, the sound will sound muffled because the mid-high frequencies are more directional than the lows. In testing (below) the difference was about 3 dB SPL (Sound Pressure Level). Note: A change of 3 dB is accepted as the smallest difference in level that is easily heard by most listeners listening to speech or music. It is a slight increase or decrease in volume<ref> [https://www.e2s.com/references-and-guidelines/db-decibel-ratings db Decibel Ratings]</ref>.

ST at 17:55, 20 August 2024

2024-08-20T17:55:49Z

← Older revision		Revision as of 17:55, 20 August 2024
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	\|RightBody = The L1 systems offer extremely wide horizontal coverage (approximately 180 degrees), however, we rarely consider loudness behind them.		\|RightBody = The L1 systems offer extremely wide horizontal coverage (approximately 180 degrees), however, we rarely consider loudness behind them.

	If you find the L1 systems too loud when placed behind you, consider using high-quality hearing protection. Putting them beside or ahead of you will make very little difference for frequencies up to 1000 Hz or the sensation of loudness. However, behind the L1 system, the sound will sound muffled because the mid-high frequencies are more directional than the lows.		If you find the L1 systems too loud when placed behind you, consider using high-quality hearing protection. Putting them beside or ahead of you will make very little difference for frequencies up to 1000 Hz or the sensation of loudness.

			If you place the L1 beside you,

			However, behind the L1 system, the sound will sound muffled because the mid-high frequencies are more directional than the lows.


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	== Test Results ==		== Test Results ==

	The average difference measuring in front of an L1 and directly behind it (180 degrees off-axis) is +3 dB SPL dBA and dBC.		The average difference measuring in front of an L1 and directly behind it (180 degrees off-axis) is +3 dB SPL dBA and dBC.
			The noticeable difference is that the sound behind the L1 is muffled (mid-high frequencies less apparent).

	The average difference measuring in front of an L1 and beside it (90 degrees off-axis) is +3 dB SPL dBA and dBC.		<!--The average difference measuring in front of an L1 and beside it (90 degrees off-axis) is +3 dB SPL dBA and dBC. -->

ST at 17:49, 20 August 2024

2024-08-20T17:49:07Z

← Older revision		Revision as of 17:49, 20 August 2024
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	\|RightBody = The L1 systems offer extremely wide horizontal coverage (approximately 180 degrees), however, we rarely consider loudness behind them.		\|RightBody = The L1 systems offer extremely wide horizontal coverage (approximately 180 degrees), however, we rarely consider loudness behind them.

	If you find the ~~L1s~~ too loud when placed behind you, ~~putting~~ them beside or ahead of you will make very little difference for frequencies up to 1000 Hz. ~~Consider using~~ high~~-quality hearing protection~~.		If you find the L1 systems too loud when placed behind you, consider using high-quality hearing protection. Putting them beside or ahead of you will make very little difference for frequencies up to 1000 Hz or the sensation of loudness. However, behind the L1 system, the sound will sound muffled because the mid-high frequencies are more directional than the lows.


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	== Test Results ==		== Test Results ==

	The average difference measuring in front of an L1 and directly behind it (180 degrees off-axis) is +3 dB SPL dBA and dBC.		The average difference measuring in front of an L1 and directly behind it (180 degrees off-axis) is +3 dB SPL dBA and dBC.

	The average difference measuring in front of an L1 and beside it (90 degrees off-axis) is +3 dB SPL dBA and dBC.		The average difference measuring in front of an L1 and beside it (90 degrees off-axis) is +3 dB SPL dBA and dBC.

ST at 17:43, 20 August 2024

2024-08-20T17:43:25Z

@@ Line 29: / Line 29: @@
 === Feedback ===
 Feedback (high-pitched feedback) is typically at frequencies above 2000 Hz, so there may be some benefit to position the L1s outside the polar pattern of microphones if you have exhausted other approaches for dealing with feedback. You can do this by putting the L1s in line with or ahead of the microphones. T
 ----
 [[Category:Acoustics]]
 [[Category:Feedback]]

ST at 17:16, 17 August 2024

2024-08-17T17:16:10Z

← Older revision		Revision as of 17:16, 17 August 2024
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	----		----
	[[Category:Acoustics]]		[[Category:Acoustics]]
			[[Category:Feedback]]

ST at 17:15, 17 August 2024

2024-08-17T17:15:21Z

← Older revision		Revision as of 17:15, 17 August 2024
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	\|RightBody = The L1 systems offer extremely wide horizontal coverage (approximately 180 degrees), however, we rarely consider loudness behind them.		\|RightBody = The L1 systems offer extremely wide horizontal coverage (approximately 180 degrees), however, we rarely consider loudness behind them.

			If you find the L1s too loud when placed behind you, putting them beside or ahead of you will make very little difference for frequencies up to 1000 Hz. Consider using high-quality hearing protection.


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	[[File:Instrument-Sound-EQ-Chart.jpg\|link=File:Instrument-Sound-EQ-Chart.pdf]]		[[File:Instrument-Sound-EQ-Chart.jpg\|link=File:Instrument-Sound-EQ-Chart.pdf]]

			=== Feedback ===
			Feedback (high-pitched feedback) is typically at frequencies above 2000 Hz, so there may be some benefit to position the L1s outside the polar pattern of microphones if you have exhausted other approaches for dealing with feedback. You can do this by putting the L1s in line with or ahead of the microphones. T

	----		----
	[[Category:Acoustics]]		[[Category:Acoustics]]

ST at 17:07, 17 August 2024

2024-08-17T17:07:43Z

← Older revision		Revision as of 17:07, 17 August 2024
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	== Major Concepts ==		== Major Concepts ==
	===How Directional are the L1s ===		===How Directional are the L1s ===
	Up to about 1000 Hz, the L1s are almost omnidirectional. They ~~are~~ more ~~directional at higher~~ frequencies.		Up to about 1000 Hz, the L1s are almost omnidirectional. They become increasingly directional, with more sound in the 180-degree range facing forward as the frequencies rise beyond 1000 Hz.

	Most of what we hear in the human vocal range and instruments is below 2000 Hz		Most of what we hear in the human vocal range and instruments is below 2000 Hz. See the colored chart below for more details.

			If you find the L1s too loud when placed behind you, putting them beside or ahead of you will make very little difference for frequencies up to 1000 Hz.


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	[[File:Instrument-Sound-EQ-Chart.jpg\|link=File:Instrument-Sound-EQ-Chart.pdf]]		[[File:Instrument-Sound-EQ-Chart.jpg\|link=File:Instrument-Sound-EQ-Chart.pdf]]


			----
			[[Category:Acoustics]]

ST at 17:02, 17 August 2024

2024-08-17T17:02:19Z

← Older revision		Revision as of 17:02, 17 August 2024
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	== Major Concepts ==		== Major Concepts ==
	===How Directional are the L1s ===		===How Directional are the L1s ===
	Up to about 1000 Hz, the L1s are almost omnidirectional.		Up to about 1000 Hz, the L1s are almost omnidirectional. They are more directional at higher frequencies.

	Most of what we hear in the human vocal range and instruments is below 2000 Hz		Most of what we hear in the human vocal range and instruments is below 2000 Hz
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	[[File:L1 Model II Horizontal Plots.jpg]]		[[File:L1 Model II Horizontal Plots.jpg]]

	[[File:Instrument-Sound-EQ-Chart.jpg\|link=Instrument-Sound-EQ-Chart.pdf]]		[[File:Instrument-Sound-EQ-Chart.jpg\|link=File:Instrument-Sound-EQ-Chart.pdf]]