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[tunnie]

I have a Vibe CBR10 Active sub in my boot, i took it out for the trip to Holland as i needed the space.

Just put it back in, but having issues with it.

When you would turn it on, there would be a "thud" as bass test i assume, it always did this when i turned it on.

Now, it does that "thud" on every track change, and when i switch it aux, it thuds again which it never did before. There is also lots of rumbling when on Aux, when nothing is plugged in or affecting the cable.

Also if i put the volume to 0, then just put it on 1, the thud is there again.

Its really odd, it never did this before, i have not changed any settings, i just unplugged it took it out, and put it back.

Checked the earth, remote connections, power lead, RCA connetions are all good.

Checked the connections on the back of the headunit, all good, wiggled all the wires and such, does not seam to affect it.  :-/

Anyone had experience of these?

[TheBoy]

I'm too old to have such things....

[tunnie]

I'm too old to have such things....

With the night drives, and that head unit lighting up the car, would be nice to have a working NCD2013  

[Entwood]

I'm too old to have such things....

But you still have your hearing ..... I doubt half the yoof of today will at the same age !!!!

who said that .. pardon ??  

 

[TheBoy]

I'm too old to have such things....

But you still have your hearing ..... I doubt half the yoof of today will at the same age !!!!

who said that .. pardon ??  

 

Err, I think too much loud bongo bongo music in my younger days is why I'm tone deaf now...

[manny]

I have the same sub hooked up to my standard vaux head unit and i dont get that thud when i switch it on.It used to be in the wifes nissan hooked up to a sony and it never made the thuding when switched on.Could be a bad connection ?

[Dave DND]

Its either an Earth loop problem, where the earth point of the sub is at a sliightly different earth potential than the head unit (clean and check earth point of sub) or faultly RCAs (unlikely though) or possibly, the gain controls may have been knocked when it was out and sitting slightly too high.

I`d bet money on earth problem though  

[TheBoy]

Its either an Earth loop problem, where the earth point of the sub is at a sliightly different earth potential than the head unit (clean and check earth point of sub) or faultly RCAs (unlikely though) or possibly, the gain controls may have been knocked when it was out and sitting slightly too high.

I`d bet money on earth problem though  

Strangely enough, after he took it out, we had a laugh at his less than ideal 0v connection.

[tunnie]

Its either an Earth loop problem, where the earth point of the sub is at a sliightly different earth potential than the head unit (clean and check earth point of sub) or faultly RCAs (unlikely though) or possibly, the gain controls may have been knocked when it was out and sitting slightly too high.

I`d bet money on earth problem though  

Strangely enough, after he took it out, we had a laugh at his less than ideal 0v connection.

Its the best i could find with the cable supplied.

Dave whats the ideal gain settings? I was fiddling with them to try and stop it doing it, if i turned the gain and freq down, it still did it just more noticeable. I had to turn the gain up to get any kind of bass from the tracks.

[Dave DND]

Its either an Earth loop problem, where the earth point of the sub is at a sliightly different earth potential than the head unit (clean and check earth point of sub) or faultly RCAs (unlikely though) or possibly, the gain controls may have been knocked when it was out and sitting slightly too high.

I`d bet money on earth problem though  

Strangely enough, after he took it out, we had a laugh at his less than ideal 0v connection.

Its the best i could find with the cable supplied.

Dave whats the ideal gain settings? I was fiddling with them to try and stop it doing it, if i turned the gain and freq down, it still did it just more noticeable. I had to turn the gain up to get any kind of bass from the tracks.

Gain needs to be matched to the Output voltage of the head unit - no more - no less. Remember its NOT a volume control.

Check the manufacturer specs of the head units RCA outputs, anywhere from 0.3V to 4V (excluding latest 8V ones) and set the gain on the amp accordingly. If specs unavailable, then measure with a hand held scope the max voltage from the head unit before clipping and set accordingly.

But all this is irrelavent if the earth connection is not 100%.

Big self tapper through the chassis, nice bright shiny metal, and a lead that is short and of correct diameter. Anything else, or connected to any other panels will result in earth loop failure due to welded panel and seam sealeant losses.

 8-)