It's dangerous to guess, but here goes - if there is a left/right switch, you can use that to select which signal to feed the speaker for a stereo cable. If you used a mono connector, it should work fine because the audio signal would feed both the left and right signal, so either switch position would work but it wouldn't matter. Then the Beolab would use signal sensing to turn on. Sounds right, or am I missing your question?

The diagram is a simplified version.

Normally/mostly the DIN connector (powerlink) is mounted and also stereo. In the middle diagram you can see that at the switch the choice is made for left or right.

Beobuddy wrote:

The diagram is a simplified version.

Normally/mostly the DIN connector (powerlink) is mounted and also stereo. In the middle diagram you can see that at the switch the choice is made for left or right.

Except that the L/R ONLY works with the PL connector,- feeding the BL4 with a stereo signal on the 3.5mm jack in the Line setting simply doesn't work correctly...

 

@ beovox 141. You can solder one R and one L mono cable.

Hi Beovox141,

The line input is similar to that on Beolab 6000/8000, as you mentioned already the Left/Right switch only applies to the Powerlink input.  When in Line mode, the speaker takes the mono audio input fed to it via the 3.5mm jack and auto-senses, so the speaker turns on when the audio starts and it then turns off three minutes after the audio has stopped.

I keep a wide range of cables for Beolab 4 (Powerlink and PC versions), please ask if you need any further help: 

Hi Steve 😁

The picture of the cable on you website threw me off a bit.....

 

It shows stereo Jacks in both ends, but in the text you actually describe two different connectors, so I am assuming  the ones plugging into the BL4 are mono, because if they're not,- it wont work. You will get sound but its kind of a pseudo mono.

THAT IS UNLESS yous are as clever as I think you are 🙂

Its a very strange implementation of an input, but I guess if its B&O it has to be... 👍

I compiled pictures of all the BL4 parts from EBAY here:

Hi Beovox141,

Please don't worry, although I use stereo jacks, they are each wired as mono - this gives me the option to use higher quality jacks that aren't produced in mono versions.  All my cables are tested and working perfectly prior to shipping - I use Beolab 4s at home, so I know them well!

Kind regards, Steve.

Hi Steve.

You can buy higher quality 3.5 mm. Mini Jack Mono Male Connector, metal.

Here -

Hi,

Thanks for that, but I now use a higher quality Neutrik plug than that one, which isn't shown on my website photo (I will get the pictures updated very soon).

Kind regards, Steve.