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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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Velodyne ct100 loud humming +speaker drown backwards.Can I fix at home


The loud humming could be caused by a cable on the input that is not grounded. It could also be caused by some sort of power supply failure.

Feb 10, 2016 | Velodyne Audio Players & Recorders

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Behringer CT100...X Pattern on LED grid when testing a mono instrument cable


Yes, a display of "X" means the cable is good. This guy does a good job with laying it all out. There's other modes to check the cable.
http://guitarkitbuilder.com/content/gear-review-behringer-ct100-cable-tester

Jan 20, 2013 | Behringer Ct100 Cable Tester

1 Answer

My Velodyne DPS-10 subwoofer hums when you plug in the RCA cable. The hum increases in volume when you touch the rear metal panel.


hi,
You have to check the RCA cable to the sub woofer. The RCA cabe have two connections inside it, one is for gain and the other is for ground sheild. If the ground sheild is broken then there will be hum from the sub woofer and it will increase if you touch the ground (rear metal pannel is connected to the ground). Replace the cable and check it again.
ok

Jul 17, 2011 | Velodyne DPS-10 Subwoofer

1 Answer

Not enough sub output can i add one more sub?


the sub should have its own volume control, you could also buy another powered sub and hook it up instead.

Mar 12, 2011 | Sony HT-CT100 Theater System

1 Answer

How can i check cable on ct100


These are a simple DC continuity/short tester.

You just plug both ends of the cable in and there are indicators showing condition.

HOWEVER: I recently found 6 brand new cables that resulted in HUM from mics. These cables had a pair of wires reversed at BOTH ends and contiuity was fine, but the shield was on the wrong pins of the XLR.

If this is your problem, you will find that the shield of the XLR is connected to pin 3 instead of pin 1. The numbering of the pins are weird on XLR connectors with pin 3 at the APEX of the triangle.

Cables MADE IN CHINA... I changed all the connections on site of the gig as I had soldering equipment. I informed the vendor... they had 13000 of these in stock and many must be in the field. They were going to check them,,, I am sure my 6 cables wern't the only bad ones.

Moral of the story: there is more to electrical cables than just continuity!

Jul 03, 2010 | Behringer Ct100 Cable Tester

1 Answer

Beringher CT100.. X Pattern on LED grid when testing an xlr cable


This site has diagrams... not the best but clear enough.

PLEASE note that the pin numbering is kind of goofy... The pins of both the male and female tie to identical pin numbers.

You PROBABLY have misread the numbering at one end.

A KEY thing is to get the shield on pin 1 at both ends.

I recommend that you uncap BOTH connectors, mate them, and verify the same color goes straight across as you solder the wires..

Note: I had some brand new cables delivered that the shield had been connected to pin 3 (middle one) and I had hum ! Note that this defect would NOT be caught by your cable tester as there was conituity between corresponding pin numbers.

May 04, 2010 | Behringer Ct100 Cable Tester

1 Answer

Making loud humming noise only.but if you plug


If I understand this correctly: with NO input or cable attached it hums; with an RCA cable attached it works. (What does 'some' mean in this regard?)

You say that connecting the RCA cable improves its sound. That tells me you're supplying a ground through the RCA cable for stray voltage in the sub.

It seems there may be a basic power issue if it hums with no input. Sometimes a given power source in a home may be wired differently than others or may insufficient grounding, which can result in hum. Try reversing the sub's power plug or move it somewhere else.

Since the sub contains its own electronics it is also susceptible to strong external magnetic fields. Keep it and any signal cables leading to it some distance away from other electrical devices like TV's.

Apr 08, 2010 | Velodyne CT-100 Speaker

1 Answer

Speaker makes a rather loud humming noise.


You can go buy a audioquest SUB-X subwoofer cable with a additional ground wire on it an connect the ground cable to the ground slot of the receiver an the other end to a screw on the sub or into one of the high output terminals on the woofer if it has them an this will take that humming sound right away but the cable is around $90

Mar 28, 2010 | Velodyne HGS-10 Subwoofer

1 Answer

Humming sound when on/off


humming sound when on is usual if the volume is turned up.
humming sound the same when on or off could be transformer plates fluxing.
if loud recommend replacement of power supply.
if ok then recommend unplugging the device after use.

Nov 13, 2009 | Velodyne DPS-10 Subwoofer

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