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Velodyne Ct100 loud hum

I have a loud hum problem with Velodyne CT100.
The hum appears when I turn up the volume with only sub cable in it, but when I unplug the sub cable the hum disappear. I replaced the cable with two known good sub cable the hum comes back.I removed the amp plate and didn't see any visual defect.

Joe

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3 Suggested Answers

  • 1 Answer

SOURCE: Receiver humming momentarily when turned on

i have solved thsi problem. The reseller suggested that probably a earthconnection was demaged and indeed that was the problem. by heating the earthconnections, specially the wired ones this problem disappeared.

Posted on Feb 02, 2008

  • 124 Answers

SOURCE: Velodyne sub noise


Sounds like a bad amplifier.

One of the input caps on the power side is my guess

best bet is to contact Velodyne for a repair or replacment

Posted on Jan 04, 2009

dunnbiker
  • 8546 Answers

SOURCE: I have a Boston Acoustics

I'm thinking you have an open shield ground on the RCA input side. Connecting speaker inputs possibly restores the ground. Try connecting the high level inputs then disconnect the remote end of the cables (floating the grounds).

Then get out an ohmmeter and find that open circuitor or bad solder joint between RCA ground and real ground in the speaker's amplifier. Or.... if speaker ground kills the hum and you want to use RCA Line Level input to the sub, just connect one minus speaker output on your source amp to one minus on the sub's amp.

Posted on Mar 01, 2011

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Why is there low humming in the receiver sub channel(only?)


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I have a Boston Acoustics VR-500 Subwoofer with a problem. As soon as anything is plugged into the line level RCA jacks, the subwoofer produces a loud buzz/hum. I have tried connecting it to the subwoofer...


I'm thinking you have an open shield ground on the RCA input side. Connecting speaker inputs possibly restores the ground. Try connecting the high level inputs then disconnect the remote end of the cables (floating the grounds).

Then get out an ohmmeter and find that open circuitor or bad solder joint between RCA ground and real ground in the speaker's amplifier. Or.... if speaker ground kills the hum and you want to use RCA Line Level input to the sub, just connect one minus speaker output on your source amp to one minus on the sub's amp.

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I have the same setup. Use 1 pair (Left/Right) RCA to RCA cable. Connect from Velodyne "Input" (left connectors) to Yamaha SubWoofer #1 Preamp output. Make sure you have the sub's volume (left knob from back) very low (full counter clockwise is "Min") until you are setting up the audio balance in your house/room. Set Low Pass cross over to 80Hz, Phase switch to 0, subsonic to 20Hz, X-over to "IN", Power to "auto"
On Yamaha RXV1 remote control, go into speaker setup and turn on Sub and any other speakers you have connected.
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Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Sounds like a bad cable or pickup. Set the volume to a level that you can tolerate. You may want to turn off the amp between each of these steps. Unplug the cable from the amp; if the hum does not go away you have problems with the amp. If it does then plug the cable into the amp and short the end that plugs into the instrument. If the hum goes away it is the pick system in the instrument, if not you have a bad cable.
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1 Answer

Velodyne sub noise



Sounds like a bad amplifier.

One of the input caps on the power side is my guess

best bet is to contact Velodyne for a repair or replacment

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BOOM SOUND AT AUDIO MODE CHANGE


Suggest turning the volume down on the Receiver/Amp before changing modes. Changing modes can produce signals that can hurt speakers if driving at mid-high levels.

Regarding the sub, turn off the receiver first, then turn off the sub. When turning everything on, turn on the sub first, then the receiver. If you still hear the noice in the sub, turn down the volume in the sub before turning it off (making note of what volume level you prefer for it when it is on).

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