Cause of 'whooshing' sound
I've got a Creative PC speaker, woofer and 5 tweeters. With inputs
disconnected I get a sort of intermittent whooshing or wind like sound. The volume of the sound is not controlled by the unit's volume control. Since this is coming from all the speakers, I assume - correctly? - that the built in power supply is acting up. I assume the built in power supply is some sort of switcher - would bad caps cause this noise? Where else should I look. Thanks in advance |
Cause of 'whooshing' sound
On 4/30/2013 4:39 PM, Bennett wrote:
I've got a Creative PC speaker, woofer and 5 tweeters. With inputs disconnected I get a sort of intermittent whooshing or wind like sound. The volume of the sound is not controlled by the unit's volume control. Since this is coming from all the speakers, I assume - correctly? - that the built in power supply is acting up. I assume the built in power supply is some sort of switcher - would bad caps cause this noise? Where else should I look. Thanks in advance I'd put an oscilloscope on the power supply. |
Cause of 'whooshing' sound
Bennett wrote:
I've got a Creative PC speaker, woofer and 5 tweeters. With inputs disconnected I get a sort of intermittent whooshing or wind like sound. The volume of the sound is not controlled by the unit's volume control. Since this is coming from all the speakers, I assume - correctly? - that the built in power supply is acting up. I assume the built in power supply is some sort of switcher - would bad caps cause this noise? Where else should I look. Thanks in advance Some times a zorc circuit is placed at the output to halt possible oscillation that can take place. This usually consist of a capacitor and R in series.. optimized to react at higher frequencies to maintain a lower lever of output Z. Some amp circuits will go into oscillation with out this circuit and you can hear all kinds of effects. Jamie |
Cause of 'whooshing' sound
mike wrote in message
... On 4/30/2013 4:39 PM, Bennett wrote: I've got a Creative PC speaker, woofer and 5 tweeters. With inputs disconnected I get a sort of intermittent whooshing or wind like sound. The volume of the sound is not controlled by the unit's volume control. Since this is coming from all the speakers, I assume - correctly? - that the built in power supply is acting up. I assume the built in power supply is some sort of switcher - would bad caps cause this noise? Where else should I look. Thanks in advance I'd put an oscilloscope on the power supply. low voltages side of the power supply , initially anyway. I would suspect a grounding/earthing problem . If it is present most of the time , locally heat or cool different areas to see if the character of the noise changes. IS this a "sound bar" DSP type of amp for throwing stereo from one speaker box, then a DSP failure? |
Cause of 'whooshing' sound
I assume the problem is present with proper inputs connected. What nearby RF
sources are there , wifi, bluetooth, other kit with SMPSs etc. Does moving any of those sources relative to the amp change the noise character. Or try the amp in another room as a diagnostic approach |
Cause of 'whooshing' sound
On 4/30/2013 4:39 PM, Bennett wrote:
I've got a Creative PC speaker, woofer and 5 tweeters. With inputs disconnected I get a sort of intermittent whooshing or wind like sound. The volume of the sound is not controlled by the unit's volume control. Since this is coming from all the speakers, I assume - correctly? - that the built in power supply is acting up. I assume the built in power supply is some sort of switcher - would bad caps cause this noise? Where else should I look. Thanks in advance Thanks to all who've replied. This isn't a DSP and/or soundbar device and definitely is not picking up RF from elsewhere. The 'whoosh' is present with or without input cables connected. |
Cause of 'whooshing' sound
Bennett wrote in message
... On 4/30/2013 4:39 PM, Bennett wrote: I've got a Creative PC speaker, woofer and 5 tweeters. With inputs disconnected I get a sort of intermittent whooshing or wind like sound. The volume of the sound is not controlled by the unit's volume control. Since this is coming from all the speakers, I assume - correctly? - that the built in power supply is acting up. I assume the built in power supply is some sort of switcher - would bad caps cause this noise? Where else should I look. Thanks in advance Thanks to all who've replied. This isn't a DSP and/or soundbar device and definitely is not picking up RF from elsewhere. The 'whoosh' is present with or without input cables connected. Assuming its safe to short an input to ground , is the defect still present then? |
Cause of 'whooshing' sound
On 5/3/2013 9:28 AM, N_Cook wrote:
Bennett wrote in message ... On 4/30/2013 4:39 PM, Bennett wrote: I've got a Creative PC speaker, woofer and 5 tweeters. With inputs disconnected I get a sort of intermittent whooshing or wind like sound. The volume of the sound is not controlled by the unit's volume control. Since this is coming from all the speakers, I assume - correctly? - that the built in power supply is acting up. I assume the built in power supply is some sort of switcher - would bad caps cause this noise? Where else should I look. Thanks in advance Thanks to all who've replied. This isn't a DSP and/or soundbar device and definitely is not picking up RF from elsewhere. The 'whoosh' is present with or without input cables connected. Assuming its safe to short an input to ground , is the defect still present then? Yes |
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