Mixer & PA problem

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JestersTear1

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My PA speaker has a single stereo TRS jack in. My mixer has dual mono (L & R) outputs.

When I use a '2 x mono to stereo' adaptor and try to play a track from the laptop via the 'cd/tape in' the two channels seem to cancel each other out. If I pan hard left or right its fine but the sound fades out to a dull boxy mess when in the centre - almost like they are cancelling each other out. Is there another sort of adaptor I need?

What gives?

Equipment is :

Behringer B212A Powered speaker

Behringer Xenyx 1002FX Mixer
 
JestersTear1 said:
My PA speaker has a single stereo TRS jack in. My mixer has dual mono (L & R) outputs.

When I use a '2 x mono to stereo' adaptor and try to play a track from the laptop via the 'cd/tape in' the two channels seem to cancel each other out. If I pan hard left or right its fine but the sound fades out to a dull boxy mess when in the centre - almost like they are cancelling each other out. Is there another sort of adaptor I need?

What gives?

Equipment is :

Behringer B212A Powered speaker

Behringer Xenyx 1002FX Mixer
Click to expand...
Sounds like phase problems. Why do you only have one speaker?

You could just send one channel, although you'll miss all the stuff from the other. Maybe you could output from the laptop in mono...
 
Hi - the vocalist uses the other for practice at home. I thought I would be able to convert the signal to mono using the adaptor.
 
JestersTear1 said:
Hi - the vocalist uses the other for practice at home. I thought I would be able to convert the signal to mono using the adaptor.
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If it doesn't work, then try it my way... ;)

Ohh, and delete the other two threads.
 
Panning everything to one side and use one out would be an option. Generally it's not a good idea to combine outputs.
 
Your PA speaker does not have a stereo option. It is a single speaker and can accept mono only. You need to get another speaker and go mono -mono for both speakers
 
What Morningstar said is pretty correct. That is not a stereo TRS jack on your speaker, that is a BALANCED TRS jack. YOu need to send all audio data in on the tip and not some data on tip and some data on ring which is what is throwing it off. If you r mixer does not have a mono output, then like siggested somewhere above, pan everything to one side and get the proper adaptor to run to your speaker.
 
xstatic said:
What Morningstar said is pretty correct. That is not a stereo TRS jack on your speaker, that is a BALANCED TRS jack. YOu need to send all audio data in on the tip and not some data on tip and some data on ring which is what is throwing it off. If you r mixer does not have a mono output, then like siggested somewhere above, pan everything to one side and get the proper adaptor to run to your speaker.
Click to expand...

Hmmm....I thought as much but the manual and the website both say it is a stereo input jack.

Will try the other suggestions and see how I get on.

Thanks again.
 
If the left & Right outputs on the mixer (Behringer Xenyx 1002fx) are both seperate mono ports then could I use a Y adaptor that is 2 x female mono to 1 x male mono?

This should then combine/mix both channels into one single mono input signal? Then I would get both left & right channels but in a mono mix?

Does that sound right?
 
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JestersTear1 said:
If the left & Right outputs on the mixer (Behringer Xenyx 1002fx) are both seperate mono ports then could I use a Y adaptor that is 2 x female mono to 1 x male mono?

This should then combine/mix both channels into one single mono input signal? Then I would get both left & right channels but in a mono mix?

Does that sound right?
Click to expand...
That's not right. It's a balanced input, not a stereo input. You need to send from one channel(left) to the speaker, and pan both signals from the laptop left.
 
JestersTear1 said:
Hmmm....I thought as much but the manual and the website both say it is a stereo input jack.

Will try the other suggestions and see how I get on.

Thanks again.
Click to expand...
A stereo jack and balanced trs jack are pretty much synonymous. The plug itself can be used for either situation. It's poor language for Behringer to be calling it a stereo jack in this particular instant and most likely happened when the manual was translated to English.
 
This post has been replaced by post #16.

G.
 
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JestersTear1 said:
If the left & Right outputs on the mixer (Behringer Xenyx 1002fx) are both seperate mono ports then could I use a Y adaptor that is 2 x female mono to 1 x male mono?

This should then combine/mix both channels into one single mono input signal? Then I would get both left & right channels but in a mono mix?

Does that sound right?
Click to expand...
Someone check me out on this, but unless I'm mistaken you do not want to combine outputs like that.
 
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mixsit said:
Someone check me out on this, but unless I'm mistaken you do not want to combine outputs like that.
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Right. With a Y cable you can split a signal just fine but you can't combine two signals into one without problems occurring... like hum, odd changes to the sound quality, possible gear damage.
 
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That TRS jack on the Berrie is a balanced mic/line input into the built-in preamp/amp. Yes the TRS plug and jack can on paper be used for either mono balanced or stereo unbalanced purposes, but in this case the circuit behind the jack is EXPECTING a mono balanced signal; it is not, as the manual implies, purposed as a "stereo jack".

This means that the receiving circuit behind the jack will - as part of the balanced design - reverse phase on one of the channels if you pump stereo into it. This is probably the main cause of the OPs problem.

Jesters, what I would recommend as a cheaper, easier and safer way to monitor - if your mixer has the capacity - would be to send everything to a mono aux send out on the mixer and send that via mono cable to the PA for monitoring.

G.
 
He he - I think I better leave it all well alone!!

Thanks guys.
 
XLR said:
Right. With a Y cable you can split a signal just fine but you can't combine two signals into one without problems occurring... like hum, odd changes to the sound quality, possible gear damage.
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It isn't spliting the signal. There is always two signals, its just going from a single stereo connector to 2 mono connectors. The signal remains the same.
 
pandamonk said:
It isn't spliting the signal. There is always two signals, its just going from a single stereo connector to 2 mono connectors. The signal remains the same.
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No, I'm talking about a mono signal being split with a Y cable to go to two different mono inputs.
 
XLR said:
No, I'm talking about a mono signal being split with a Y cable to go to two different mono inputs.
Click to expand...
So a balanced mono signal spliting to two unbalanced? These will be reverse phased from each other, won't they? 'cause balanced wire, i believe, works by sending two of the same signal, reverse phase from each other, down each other two cores, then whatever receives them reverses the phase back, and adds it to the other, which cancels any electromagnetic interference picked up.
 
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