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Old 10th February 2013, 03:14 AM   #1
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Default Stereo To Mono with SINGLE Powered Speaker

I have a powered speaker (Behringer B215D). What is the best way to plug an iPod into ONE SPEAKER?

Here is the I/O diagram: http://www.behringer.com/assets/B208...5D_fig1_XL.png

Is there anyway to preserve the stereo signal from the iPod?

Will a 3.5mm to 1/4 inch TRS adapter carry the left and right stereo channels to the speaker?

Thanks.
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Old 10th February 2013, 03:51 AM   #2
JackNZ is offline JackNZ  New Zealand
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If you are looking for the best way, then you should use a small mixer with 2 ore more mono channels. Plug your I-pod with a cable from the minijack to two quarterinch plugs in separate channels and leave the channels pan on middle. That way the mixer is summing your L+R to mono.
Simpler way ist to make a adapter which puts the two grounds of the red and white cable together and also the two hot wires. Plays, but I wouldnt recommend it. But sometimes I do it as well.
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Old 10th February 2013, 10:26 PM   #3
JMFahey is offline JMFahey  Argentina
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Avoid straight joining 2 outputs.
Join grounds and solder to ground of the male plug which goes into the powered speaker, but join 2 hot wires coming from IPod into the single hot plug pin by first adding a 1K resistor in series with each of them.
You connect the joint of said 2 resistors to the plug hot pin.
They are called "mixing resistors" for a reason.
A.k.a. "passive mixer".
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Old 10th February 2013, 10:40 PM   #4
JackNZ is offline JackNZ  New Zealand
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This would be the correct way to avoid L + R current interacting and putting load on the line out of the connected device.
I'm sorry I forgot this elegant way of building a adapter. The components fit in a phone plug.
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Old 11th February 2013, 12:45 PM   #5
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Quote:
Originally Posted by JackNZ View Post
This would be the correct way to avoid L + R current interacting and putting load on the line out of the connected device.
I'm sorry I forgot this elegant way of building a adapter. The components fit in a phone plug.
It's nice in theory - but in practice the headphone output can simply be joined together, they either have internal resistors, or if direct from a chip, the chip is designed to allow it.

So by all means stick two 1K resistors in as a passive mixer, but it won't sound any better, nor will it protect anything.
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Old 11th February 2013, 01:16 PM   #6
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I posted a detailed instructional post, but it looks like it got passed over. Here we go again,... TRS (Tip, Ring, Sleeve) which looks like a stereo jack (left, right, ground) is not a stereo connection. It is a "balanced" connection = Signal Positive, Signal Negative, and Ground. This is a "low noise" method of moving an audio signal from one place to another. You cannot jack the stereo from a portable audio device into any TRS connection as you suggested.

You need on one of the following: A mixer (purchased, active opamp, or passive (with resistors)); as suggested by others, in order to combine the Left and the Right Signals together and then on to your powered speaker. If you can't build one yourself, buy a cheap one, plug your stereo connection into your mixer via a stereo 1/8" plug to a left and right mono 1/4" adapter breakout cable; and then plug the left mono cable end into one mixer channel strip and the right into another. Then you can use either the "balanced out" Left or Right mixer output to your powered speaker.

I would also suggest that you read about the PA Fundamentals; ie Balanced and Un-Balanced cabling, mixers, and how they function, and so forth. This knowledge will serve you well.

If this second post happens to make it up on the board, I could draw you a "passive" and an "active" method that would allow you to combine the stereo signal into a mono signal that would allow you to accomplish your goal with a degree of success.
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Old 11th February 2013, 01:26 PM   #7
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Mark Rakemaker View Post
I posted a detailed instructional post, but it looks like it got passed over.


Actually it didn't. The OP has (for has, now read had ) two identical threads on the go. The one you replied to was in the "parts forum".

Other thread deleted to avoid confusion.
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Old 15th February 2013, 12:24 AM   #8
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Sorry about the duplicate posts. It was totally an error.

Thanks for all the replies. I understand balanced and unbalanced. This is just a strange predicament. Hooking up ONE (mono) speaker when you have a Stereo signal.

What happens if I send a stereo signal (Left audio, right audio, shield) to the speaker on a TRS cable? Is it better to use a TS cable, a TRS cable or it doesn't matter either way?

One more thing. Unrelated to above. WHEN USING TWO SPEAKERS. The speaker owner's manual labels this as a TRS input. Is it ok to use a STEREO-Y adapter (3.5mm stereo to dual RCA) and hook them up using RCA to TS adapters with TS cables to the TWO speakers? Does it matter whether I use TS or TRS cables in this instance?

Thanks again.

>

Last edited by johnviera; 15th February 2013 at 12:32 AM.
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Old 15th February 2013, 09:31 AM   #9
JackNZ is offline JackNZ  New Zealand
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The TRS input takes + on tip, - on ring and ground is ground.
So if you go in with left on tip and right on ring, the input is going to subtract if it is symetric. If not, it is going to short the tip channel to ground. That's it, mate.
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Old 15th February 2013, 10:26 AM   #10
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OK. Thanks again. I wasn't sure what that input would do with the asymmetric signal.

Cheers.
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