Sound Drop Outs at High Volume - Revision history

ST: /* Intermittent Drop Outs Using the {{T1}} and {{Model II}} */

2018-07-12T13:47:59Z

Intermittent Drop Outs Using the {{T1}} and {{Model II}}

← Older revision		Revision as of 13:47, 12 July 2018
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	The user manual states 5 amps or greater, so six amps is a good approximation. For that reason, we recommend only up to two {{Model II}}s on a single 15A circuit breaker in the US.		The user manual states 5 amps or greater, so six amps is a good approximation. For that reason, we recommend only up to two {{Model II}}s on a single 15A circuit breaker in the US.

			{{L1 Model II with T1 Sound Drop Outs}}
	~~A quick review of three POSSIBLE causes of audio cutting out follows. That will help us determine what is going on.~~

	1. If there is a non-Bose B1/B2 cable, OR if the B1/B2 cable has a defective, loose connection, audio can intermittently mute. It may happen with loud music because the speaker will be vibrating and shake the loose connection. This will sound like a clean muting of all audio for a second or so. There will be no visual indication.
	~~Fixable by tightening the screws in the connector.~~

	~~This would only happen on one~~ {{Model II~~}} at a time. If two dropped out, this is not the issue.~~



	~~2. Very low, out-of spec, AC power (less than ~105 VAC on a 120V system, or less than around ~215 V on a 230 V system. The manual states 110 and 220 for good measure) coupled~~ with high signal level. This can be caused by a low power source, or one where the outlets are a very long distance from the electrical panel, extra equipment on the same electrical branch, power sags or dropouts, long or multiple extension cords, or small gauge extension cords.

	~~In this case loud music increases the current draw, and the voltage drop over the extension cord will lower the voltage enough to cause a reset of the {{~~T1}}~~, or the L1 MII base.~~

	~~If the {{T1}} resets, the LED’s (input trim level, mute LEDs) will turn off. The LCD display will remain blue, but be blank until the unit restarts.~~
	~~The L1 MII base can reset but it does not show on the indicators.~~

	~~In either case the answer is to ensure the power supply is solid, and dedicated to the audio equipment, and to have as short cords as possible with large wires.~~
	~~Also be aware that separate wall outlets may still be on the same breaker.~~

	If there are intermittent voltage sags or outages in your area (as there are in parts of Florida, for example), it is possible that some equipment that does not use a lot of power (like mixers) will continue to operate, and equipment requiring high power, like amplifiers, may not be able to produce audio.

	~~Those outages can happen any time, but are less likely to repeat, or unlikely to happen only at loud parts of the music.~~



	~~3. Defective units: If the first two are not the cause, then either the T1 or base unit may be defective, and you should contact customer service.~~


	~~I hope this helps.~~

	~~Bill-at-Bose [http://bose.infopop.cc/eve/forums/a/tpc/f/867107664/m/9390020876?r=7270097876#7270097876 What could cause sound drop outs]~~

ST: Added diagnostics from Bill Becker - formatting and content edits

2015-10-25T16:04:11Z

Added diagnostics from Bill Becker - formatting and content edits

← Older revision		Revision as of 16:04, 25 October 2015
Line 14:		Line 14:
	The second thing we did was redesign the {{L1}} software so that it could "filter out" the effects of momentary crosstalk and not cause the problem. That way future L1's would not have the issue.		The second thing we did was redesign the {{L1}} software so that it could "filter out" the effects of momentary crosstalk and not cause the problem. That way future L1's would not have the issue.

	=== Intermittent Drop Outs Using the {{T1}} and Model II ===		=== Intermittent Drop Outs Using the {{T1}} and {{Model II}} ===


	The user manual states 5 amps or greater, so six amps is a good approximation. For that reason, we recommend only up to two ~~L1 MII’s~~ on a single 15A circuit breaker in the US.		The user manual states 5 amps or greater, so six amps is a good approximation. For that reason, we recommend only up to two {{Model II}}s on a single 15A circuit breaker in the US.


Line 25:		Line 25:
	Fixable by tightening the screws in the connector.		Fixable by tightening the screws in the connector.

	This would only happen on one ~~L1 MII~~ at a time. If two dropped out, this is not the issue.		This would only happen on one {{Model II}} at a time. If two dropped out, this is not the issue.


Line 31:		Line 31:
	2. Very low, out-of spec, AC power (less than ~105 VAC on a 120V system, or less than around ~215 V on a 230 V system. The manual states 110 and 220 for good measure) coupled with high signal level. This can be caused by a low power source, or one where the outlets are a very long distance from the electrical panel, extra equipment on the same electrical branch, power sags or dropouts, long or multiple extension cords, or small gauge extension cords.		2. Very low, out-of spec, AC power (less than ~105 VAC on a 120V system, or less than around ~215 V on a 230 V system. The manual states 110 and 220 for good measure) coupled with high signal level. This can be caused by a low power source, or one where the outlets are a very long distance from the electrical panel, extra equipment on the same electrical branch, power sags or dropouts, long or multiple extension cords, or small gauge extension cords.

	In this case loud music increases the current draw, and the voltage drop over the extension cord will lower the voltage enough to cause a reset of the T1, or the L1 MII base.		In this case loud music increases the current draw, and the voltage drop over the extension cord will lower the voltage enough to cause a reset of the {{T1}}, or the L1 MII base.

	If the T1 resets, the LED’s (input trim level, mute LEDs) will turn off. The LCD display will remain blue, but be blank until the unit restarts.		If the {{T1}} resets, the LED’s (input trim level, mute LEDs) will turn off. The LCD display will remain blue, but be blank until the unit restarts.
	The L1 MII base can reset but it does not show on the indicators.		The L1 MII base can reset but it does not show on the indicators.

ST at 16:02, 25 October 2015

2015-10-25T16:02:08Z

← Older revision		Revision as of 16:02, 25 October 2015
Line 13:		Line 13:

	The second thing we did was redesign the {{L1}} software so that it could "filter out" the effects of momentary crosstalk and not cause the problem. That way future L1's would not have the issue.		The second thing we did was redesign the {{L1}} software so that it could "filter out" the effects of momentary crosstalk and not cause the problem. That way future L1's would not have the issue.

			=== Intermittent Drop Outs Using the {{T1}} and Model II ===


			The user manual states 5 amps or greater, so six amps is a good approximation. For that reason, we recommend only up to two L1 MII’s on a single 15A circuit breaker in the US.


			A quick review of three POSSIBLE causes of audio cutting out follows. That will help us determine what is going on.

			1. If there is a non-Bose B1/B2 cable, OR if the B1/B2 cable has a defective, loose connection, audio can intermittently mute. It may happen with loud music because the speaker will be vibrating and shake the loose connection. This will sound like a clean muting of all audio for a second or so. There will be no visual indication.
			Fixable by tightening the screws in the connector.

			This would only happen on one L1 MII at a time. If two dropped out, this is not the issue.



			2. Very low, out-of spec, AC power (less than ~105 VAC on a 120V system, or less than around ~215 V on a 230 V system. The manual states 110 and 220 for good measure) coupled with high signal level. This can be caused by a low power source, or one where the outlets are a very long distance from the electrical panel, extra equipment on the same electrical branch, power sags or dropouts, long or multiple extension cords, or small gauge extension cords.

			In this case loud music increases the current draw, and the voltage drop over the extension cord will lower the voltage enough to cause a reset of the T1, or the L1 MII base.

			If the T1 resets, the LED’s (input trim level, mute LEDs) will turn off. The LCD display will remain blue, but be blank until the unit restarts.
			The L1 MII base can reset but it does not show on the indicators.

			In either case the answer is to ensure the power supply is solid, and dedicated to the audio equipment, and to have as short cords as possible with large wires.
			Also be aware that separate wall outlets may still be on the same breaker.

			If there are intermittent voltage sags or outages in your area (as there are in parts of Florida, for example), it is possible that some equipment that does not use a lot of power (like mixers) will continue to operate, and equipment requiring high power, like amplifiers, may not be able to produce audio.

			Those outages can happen any time, but are less likely to repeat, or unlikely to happen only at loud parts of the music.



			3. Defective units: If the first two are not the cause, then either the T1 or base unit may be defective, and you should contact customer service.


			I hope this helps.

			Bill-at-Bose [http://bose.infopop.cc/eve/forums/a/tpc/f/867107664/m/9390020876?r=7270097876#7270097876 What could cause sound drop outs]



	<noinclude>		<noinclude>

ST at 20:40, 4 September 2013

2013-09-04T20:40:16Z

← Older revision		Revision as of 20:40, 4 September 2013
Line 10:		Line 10:
	So we looked at capacitance per foot with different wire guages, and with twisted vs untwisted pairs in the same cable, and looked at our sensing algorithm, and did two things to solve the problem:		So we looked at capacitance per foot with different wire guages, and with twisted vs untwisted pairs in the same cable, and looked at our sensing algorithm, and did two things to solve the problem:

	We had Mark at [http://www.audiopile.net/ Audiopile.net] send us some samples to our new spec, we checked them, and they worked well. This gave a method for our customers who needed a long B1 cable to get [http://www.audiopile.net/products/Speaker_Cables/NL-4_speaker_cable/~~NL413_cutsheet~~.~~htm~~ one that worked].		We had Mark at [http://www.audiopile.net/ Audiopile.net] send us some samples to our new spec, we checked them, and they worked well. This gave a method for our customers who needed a long B1 cable to get [http://www.audiopile.net/products/Speaker_Cables/NL-4_speaker_cable/NL413_dropdown_cutsheet_2.shtml one that worked].

	The second thing we did was redesign the {{L1}} software so that it could "filter out" the effects of momentary crosstalk and not cause the problem. That way future L1's would not have the issue.		The second thing we did was redesign the {{L1}} software so that it could "filter out" the effects of momentary crosstalk and not cause the problem. That way future L1's would not have the issue.

ST at 21:46, 15 December 2010

2010-12-15T21:46:04Z

← Older revision		Revision as of 21:46, 15 December 2010
Line 18:		Line 18:
	[[Category:B1 Bass Module]]		[[Category:B1 Bass Module]]
	[[Category:Troubleshooting]]		[[Category:Troubleshooting]]
			[[Category:Audiopile]]
	<references />		<references />
	</noinclude>		</noinclude>

ST:

2007-05-21T21:15:06Z

← Older revision		Revision as of 21:15, 21 May 2007
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			<noinclude>
			=== Sound Drop Outs at High Volume ===
			</noinclude>
	{{Classic icon}}		{{Classic icon}}
	~~Sound Drop Outs at High Volume~~

	~~=== Non-Standard B1 Cables ===~~
	From Bill-at-Bose<ref>[http://bose.infopop.cc/eve/forums/a/tpc/f/3976055944/m/7301030982?r=9831057754#9831057754 Bill-at-Bose talks about volume dropouts]</ref>		From Bill-at-Bose<ref>[http://bose.infopop.cc/eve/forums/a/tpc/f/3976055944/m/7301030982?r=9831057754#9831057754 Bill-at-Bose talks about volume dropouts]</ref>

ST at 20:58, 21 May 2007

2007-05-21T20:58:15Z

← Older revision		Revision as of 20:58, 21 May 2007
Line 3:		Line 3:

	=== Non-Standard B1 Cables ===		=== Non-Standard B1 Cables ===
	From Bill-at-Bose<ref>[http://bose.infopop.cc/eve/forums/a/tpc/f/3976055944/m/7301030982?r=9831057754#9831057754 Bill-at-Bose talks about volume ~~drpouts~~]</ref>		From Bill-at-Bose<ref>[http://bose.infopop.cc/eve/forums/a/tpc/f/3976055944/m/7301030982?r=9831057754#9831057754 Bill-at-Bose talks about volume dropouts]</ref>
	Hilmar and I looked into it further to find the root cause, and found the rather subtle issue that, depending on the wire gauges and how the wires were paired in the cable, loud bass signals (in the speaker pair of wires) in extra long cables could capacitively couple into the sensing pair of wires. When it happened, the {{L1}} "thought" you were changing your {{B1}} configuration and would mute.
			Hilmar<ref>Hilmar-at-Bose</ref> and I looked into ''sound dropouts'' further to find the root cause, and found the rather subtle issue that, depending on the wire gauges and how the wires were paired in the cable, loud bass signals (in the speaker pair of wires) in extra long cables could capacitively couple into the sensing pair of wires. When it happened, the {{L1}} "thought" you were changing your {{B1}} configuration and would mute.

	So we looked at capacitance per foot with different wire guages, and with twisted vs untwisted pairs in the same cable, and looked at our sensing algorithm, and did two things to solve the problem:		So we looked at capacitance per foot with different wire guages, and with twisted vs untwisted pairs in the same cable, and looked at our sensing algorithm, and did two things to solve the problem:

ST: Category:B1 Bass Module

2007-05-21T20:54:30Z

Category:B1 Bass Module

← Older revision		Revision as of 20:54, 21 May 2007
Line 14:		Line 14:
	<noinclude>		<noinclude>
	----		----
	[[Category:B1]]		[[Category:B1 Bass Module]]
	[[Category:Troubleshooting]]		[[Category:Troubleshooting]]
	<references />		<references />
	</noinclude>		</noinclude>

ST: first ed

2007-05-21T20:53:15Z

first ed

New page

{{Classic icon}}
Sound Drop Outs at High Volume

=== Non-Standard B1 Cables ===
From Bill-at-Bose<ref>[http://bose.infopop.cc/eve/forums/a/tpc/f/3976055944/m/7301030982?r=9831057754#9831057754 Bill-at-Bose talks about volume drpouts]</ref>
Hilmar and I looked into it further to find the root cause, and found the rather subtle issue that, depending on the wire gauges and how the wires were paired in the cable, loud bass signals (in the speaker pair of wires) in extra long cables could capacitively couple into the sensing pair of wires. When it happened, the {{L1}} "thought" you were changing your {{B1}} configuration and would mute.

So we looked at capacitance per foot with different wire guages, and with twisted vs untwisted pairs in the same cable, and looked at our sensing algorithm, and did two things to solve the problem:

We had Mark at [http://www.audiopile.net/ Audiopile.net] send us some samples to our new spec, we checked them, and they worked well. This gave a method for our customers who needed a long B1 cable to get [http://www.audiopile.net/products/Speaker_Cables/NL-4_speaker_cable/NL413_cutsheet.htm one that worked].

The second thing we did was redesign the {{L1}} software so that it could "filter out" the effects of momentary crosstalk and not cause the problem. That way future L1's would not have the issue.

<noinclude>
----
[[Category:B1]]
[[Category:Troubleshooting]]
<references />
</noinclude>