Hi Boycey,
Sorry for the slow reply. Thanks for buying your cables from me, I'm always happy to help if you need any advice on cabling. Don't forget that you can return these for a full refund if they don't do exactly what you need - this can be at any time up to 60days after purchase, so there is no rush.
Almost all non-B&O TVs have fixed Audio Out sockets (with some Loewe and Sony models being the exception), so these sockets are not normally suitable for directly connecting Beolab speakers. The headphone socket can be adjusted, but as you mentioned, Panasonic have a habit of hiding the headphone volume control in a separate menu which can make it tricky to use.
You can use the Beolab speakers with any audio system, whether or not it has pre-out sockets - HOWEVER - special converters are needed to reduce the signal level if you wish to connect to the amplified speaker terminals of the audio system or receiver (ie. the speakers should never be connected directly to these terminals). I can help with any combination of cables or converters if required.
The best option is always to choose an audio system with either an easily-adjustable headphone socket, or pre-out sockets, so that the speakers can be connected directly to these outlets. If you already have an audio system in the room, please let me know the details and I will be happy to advise on how to connect the speakers to this. Otherwise, an AV processor like the Audiolab 8000AP with pre-out sockets is an excellent choice.
If you need any further help or advice, please feel free to ask at any time.
Kind regards, Steve.