1/4" phone jack replacement for Behringer 215 speaker.

Another piece of information here. If I plug in a stereo phone plug, then there is no short circuit. Is there some industry standard to use stereo phone plugs in this type of application? That seems a bit strange to me.

Thanks for your reply.

"David Farber"

The jack sockets should be "mono" versions - stereo ones will short out as you have found.

.... Phil

"David Farber"

Mono plugs are always used for speaker leads.

.... Phil

Thanks for the confirmation of the mono plug and the trick to remove the screw in the Speakon jack.

Just a thought, are the outputs in antiphase and just one of them is exhibiting this "fault" if you check to chassis ground?

It's amazing Fran Allyson didn't jump all over you.

The 1/4" phone jack is (supposedly) a balanced line-level input. If you plug a mono plug into it, the plug's sleeve will short the jack's ring to ground. This is normal; there's nothing inherently wrong with this. It's one way unbalanced signals can be connected to balanced inputs.

I suspect you have a problem that isn't really a problem.

Hi William,

I think if you take an ohmmeter and connect it to a speaker input, and it measures the lowest reading that it can display, that would be cause for concern. The only time this happens is when the stereo plug is inserted into the jack even when the plug isn't connected to anything. How do you perceive that this isn't a problem?

Thanks for your reply.

I'm not sure what you mean by outputs. Do you mean the amplifier outputs? I have not connected it to any amplifier as of yet. I'm just measuring the dc resistance of the speaker at the input jack.

Thanks for your reply.

Hi William,

I think if you take an ohmmeter and connect it to a speaker input, and it measures the lowest reading that it can display, that would be cause for concern. The only time this happens is when the stereo plug is inserted into the jack even when the plug isn't connected to anything. How do you perceive that this isn't a problem?

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As far as I can tell, this isn't a speaker input -- it's a balanced amplifier input. There is no reason why a mono plug or stereo plug should show a short.

Your description of what's going on seems inconsistent and confused.

Hi William,

The are two Speakon and two 1/4" phone jacks wired in parallel that are situated in the back of the speaker cabinet. It's not a powered speaker. The inside of the speaker cabinet contains a crossover pc board, a woofer, and a midrange speaker. When I replaced the damaged 1/4" phone jack and checked continuity across the pc board input with the speakers disconnected, it measured open circuit. When I put a monaural phone plug into the jack, I rechecked the continuity and it was shorted. The monaural phone plug was not connected to anything on the other end so the short had to becoming from the jack itself. Does that make sense?

Hi William,

I think if you take an ohmmeter and connect it to a speaker input, and it measures the lowest reading that it can display, that would be cause for concern. The only time this happens is when the stereo plug is inserted into the jack even when the plug isn't connected to anything. How do you perceive that this isn't a problem?

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As far as I can tell, this isn't a speaker input -- it's a balanced amplifier input. There is no reason why a mono plug or stereo plug should show a short.

Your description of what's going on seems inconsistent and confused.

William, why do you keep doing this?

If you had bothered to do your research properly you will have discovered that the Behringer B215 is a loudspeaker. It has no internal amplifiers, the jack sockets are simply in parallel with the Speakon sockets and do exactly the same job.

Clearly there is a problem with the replacement jack socket that seems to provide a short with a mono jack plug inserted in it.

David, my usual technique where the original socket cannot easily be replaced is to simply use a chassis mounted switched jack socket hard wired to the PCB, if space allows it, after carefully working out what connections to connect to where.

Gareth.

Hi Gareth,

There is lots of space to drill a new hole and mount another jack. Then it doesn't have to fit the pc board directly. Why would it have to be a switched jack? What would it be switching?

Thanks for your reply.

Hi Gareth,

There is lots of space to drill a new hole and mount another jack. Then it doesn't have to fit the pc board directly. Why would it have to be a switched jack? What would it be switching?

Thanks for your reply.

Tell Del Hopkins I said "hi". Thanks.

"Gareth Magennis"

Then the pic backs it up.

... Phil

Do what?

I did do my research properly, because I knew I would be subjected to this crap. Did you look at the B215 link I supplied? The B215 is A POWERED SPEAKER, and the 1/4" phone jack is a balanced input. READ WHAT IT SAYS on the Details tab.

If there's something wrong, it's with Berenger's product sheet -- not my ability to read or understand it. Or perhaps David Farber gave the wrong model number. This might very well be the case, because the drawing doesn't show a Speakon connection.

I normally don't ask for apologies -- but in this case, I'll make an exception. Someone owes me an apology. Don't tell me I don't know how to interpret a product sheet.

Now, why would any manufacturer in its right mind wire a stereo jack -- input or output -- in such a way that inserting a mono plug would short out the signal? Oh, wait -- it's Behringer.

"William Sommerwanker"

Says: " * 2 professional speaker connectors (compatible with Neutrik Speakon

The "details" tab give you a different model - the B215D which incorporates a class D amplifier.

The OP made it VERY clear which model he was on about.

.... Phil

"Gareth Magennis"

Luckily, it was possible to remove the metal parts from the socket and reverse them.

Seems both Re-An and Cliff can supply mirror image versions - if you want them.

Gotta be smarter then the "average bear" if repairs are you game .....

.... Phil