mixer sound problem

[mjay]

I don't know if this thread is appropriate category to post my problem, but here it goes...

The problem is the Channel 9/10 sound/music can be heard over Channel 11/12 where the slider volume of 9/10 is full-down and the slider volume of 11/12 is full-up. It seems there is a problem with my Channel 11/12. My mixer is an Xenyx 1222FX, 4 Mono Channels and 4 Stereo Channels. Anyone who can help me out here?

[mjay]

Anyone who can help me out here with my problem?

[KitC]

What you're hearing is crosstalk. Is the mixer relatively old? This sometimes happens because most mixers today share one circuit board across all channels and the probability of crosstalk is more prevalent than with mixers from 50 yrs ago.

[mjay]

Its not really a 10 year old mixer, this XENYX 1222FX has the effects which is new in the recent batches of XENYX, did not know what date is the mixer bought because it was just given to me by a friend who does not know how to use it, I got it last November 2010.

EDIT:
And one more thing, if the mixer XLR cable output is connected a continuous ticking sound is being heard after the music from the Channel 9/10 is fully-stopped and its being heard on Channel 11/12.

[KitC]

What are connected to the concerned channels? Are the aux sends 'on' by any chance?

[mjay]

Nope, I don't use Aux Sends. Connected equipments are mainly CD Player and/or MP3 Player via RCA cable with RCA Female to 1/4 connector on the end of the RCA cable.

To get a better view on my mixer, here are links for reference:
http://www.behringer.com/EN/Products/1222FX.aspx
Extra-Large Picture

[KitC]

have you tried using 5/6 or 7/8 to see if the same problem exists with those channels? Like I said earlier, it could be crosstalk. Alternative is to use the cd/tape inputs for the cd/mp3.

[mjay]

The only disadvantage with cd/tape input is you can't use the EQs (High, Mid, Low), though I prefer to use channels with EQs, only Channel 11/12 has the problem with ticking sound while XLR output is connected.

Is there anyway to fix my problem? Because I want to maximize the usage of my mixer, I don't want the mixer to be stocked-up because of the problem with the Channel 11/12.

[mjay]

Anyone else who can help and fix my problem here?

[KitC]

hay... how can i explain it to you?

crosstalk is inherent in a lot of mixers today because of the way they are manufactured. used to be that each input channel had a separate board making crosstalk between channels a matter of having wires shorted between them (or some other medium doing the short) making it relatively easy to diagnose.

today, all mixer channels reside on one board making the possibility of shorts (or worse) even greater. one of the figures in a mixer's specs is crosstalk and the lower the figure, the better the crosstalk performance. in your problem, you are maxing out the input gain on that particular channel raising the probability that you will hear crosstalk from the channel beside it. i also guess that the level on ch 9/10 is very high causing the signal to 'jump the traces' leading to hearing the input signal on ch 11/12.

in most cases, cleaning the circuit board might eliminate the problem, but if it's a component breakdown, there's nothing that can be done about that. another thing to check is possible shorting between cables.

as for the clicking, that's harder to diagnose... need to hear a sample of that click.