XlR out problem

meinl · #1 02-20-2012, 02:27 PM

Hello,

I have a b200r (yes the same guy who asked about handles the other week) and my suspicions have been confirmed and that is that my xlr input does not work. I went to record today and all the signal I got was a buzz. The b200r has an independent gain for the output and this did not make the buzz louder or softer.

Most of the places I play I don't use this so its been out for a while i think, but I am recording this week and it has sounded bast with a DI from my amp and mic.

Anybody familiar enough Balanced outputs to tag a stab? I am thinking its a loose wire? or bad sodder joint in which case I take it apart and take a look?

Thanks,
Matthias

anderbass · #2 02-20-2012, 04:25 PM

Does that buzz noise in your recordings stop when you unplug the XLR cord from your B200R?

Have you tried plugging that XLR cord into another amp's DI (or a DI-box) to 100% confirm the problem is in your B200R?

Is your recording chain sending phantom power to the amps DI-line?

JimWasHere · #3 02-20-2012, 04:59 PM

If you can confirm that it is the DI, and not a cable or something... Does the headphone jack work? Is the headphone/line out volume up?

From the manual...

meinl · #4 02-21-2012, 07:37 AM

Yes the buzz does stop when it is unplugged. I had noticed a buzz when I plugged it in a couple months ago when I tried plugging it in, but it was a smaller place and their PA stuff wasn't the best so I assumed it was a bad mic cable.
I have not tried the headphone out, but I will give it a try.

Thanks :-)

1958Bassman · #5 02-21-2012, 07:58 AM

Quote:

Originally Posted by meinl

Yes the buzz does stop when it is unplugged. I had noticed a buzz when I plugged it in a couple months ago when I tried plugging it in, but it was a smaller place and their PA stuff wasn't the best so I assumed it was a bad mic cable.
I have not tried the headphone out, but I will give it a try.

Thanks :-)

While the headphone out has an XLR jack, it's not balanced and for the DI on a board, it's not wired correctly. Pin 1 is always ground, pin 2 is hot and pin 3 is called 'cold' when pin 2 is called 'hot'. If you were to try making an XLR-TS adapter, you would combine pins 1 & 3, not 1& 2 and 2 isn't combined with 3 unless the manufacturer did something odd with the pinout.

I would open the amp and look at the XLR jack to make sure a wire hasn't come off.

JimWasHere · #6 02-21-2012, 10:45 AM

Quote:

Originally Posted by 1958Bassman

While the headphone out has an XLR jack, it's not balanced and for the DI on a board, it's not wired correctly. Pin 1 is always ground, pin 2 is hot and pin 3 is called 'cold' when pin 2 is called 'hot'. If you were to try making an XLR-TS adapter, you would combine pins 1 & 3, not 1& 2 and 2 isn't combined with 3 unless the manufacturer did something odd with the pinout.

I would open the amp and look at the XLR jack to make sure a wire hasn't come off.

I wasn't so much looking for a workaround as I was trying to narrow down the problem. If the buzz is only present in the DI then it has to be the DI itself, whereas if it's also present in the headphone jack then it may be the level control.

BassmanPaul · #7 02-21-2012, 02:47 PM

Does the DI actually work and output a signal?? If it does you could be getting a ground loop via mains ground. You could try an isolating transformer on the DI.

meinl · #8 03-15-2013, 12:12 AM

Totally forgot about this thread... a year ago it looks like.. time to subscribe and maybe revive

Anyways recently replaced the pre tube and took look around didn't see anything unusual... no the headphone out doesn't work either...