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Subwoofer Noise Issue

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Old 02-10-2017, 01:30 PM   #1  
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Default Subwoofer Noise Issue

I just installed a new surround sound system with a Yamaha RX-v481 receiver, 5 Polk RC80I ceiling speakers and a Klipsch R10SWI wireless sub-woofer. Everything is working great except for the sub-woofer when I use RCA connections from the receiver to the sub-woofer.

When I use an RCA connection, the sub-woofer makes a single, "whoomp" noise whenever I change the state of the system. By change of state, I mean power on/off the system, change the music field or change the music source on the receiver. The sub makes no unusual noise (and works great) unless I change a setting on the receiver.

When I use the wireless connection, the sub makes no unusual noise at all.

I've used 3 different OEM RCA cables, tried grounding the receiver sub output connection and changing sub RCA input ports...Nothing makes the "whoomp" go away except connecting the sub to the receiver using the wireless setup.

I'd prefer not using the wireless connection if possible. Any suggestions as to how I can resolve this problem?
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Old 02-10-2017, 08:56 PM   #2  
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Sounds to me like the issue is in the receiver sending a spurious signal when you change something. Does the sub have a sensitivity selection for auto on/off?
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Old 02-11-2017, 12:05 PM   #3  
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Sounds to me like the issue is in the receiver sending a spurious signal when you change something. Does the sub have a sensitivity selection for auto on/off?
I completely agree with your suspicion of the receiver being the cause. I may try to confirm that by plugging an RCA into the receiver and connecting a multi-meter to the other end to see if I can measure changes in the receiver output whenever state changes.

Don't see a sensitivity selection on the Sub, but there may be something "buried" in the receiver configuration settings and I'll check for that. Thanks for the idea.

On the sub, the only options are 2 toggles and 2 dials. Toggles for 1) Phase = 0 or 180 and 2)Off/Standby/On. The dials are for Gain (set at mid power) and Crossover (set at approx 60dB).
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Old 03-24-2017, 01:43 PM   #4  
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like to know how this turns out
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Old 03-24-2017, 02:20 PM   #5  
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like to know how this turns out
It turned out poorly.

I replaced the RX-V481 receiver (thanks Crutchfield!) with a new one and the replacement performed exactly the same. I ended up relying on the wireless connection.
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