Michael wrote:

Got an old pair of Beolab Penta loudspreakers which I have connected to my Retro sound system. 

or is there some other solution?

Are you maybe trying to connect an active speaker (a BeoLab, which has its own amp) to an amplifier?

You will need a preamp with volume regulated line out output...

...or some kind of attenuator - see:

Hi Michael,

Welcome to Beoworld!

Please can you tell us the model number of the retro sound system that you wish to connect to the Penta speakers?  We can then give you the help and advice you need to get everything working well.

Kind regards, Steve.

I hope Im not double posting, for some reason it didn't save my last reply. 

Thanks for the reply guys, much appreciated. My music system is a Soundmaster NR545DAB, not the best system, but got all the features I need, and the right design for the placement. Speakers are connected through the RCA out and to the Line In.

Adjusting the sensitivity pin don't affect much, and the already amplified signal is to strong even at volume 1. This is why I was wondering if the simple preamp with volume control would be enough, if put between the sound system and the loudspeakers, or if I need a more advanced system.

Hi Michael,

Thanks for your reply.  The RCA outputs of this music system are not volume controlled, so they are not suitable for connecting to Beolab speakers.  Instead, please connect the Beolab Pentas to the headphone socket on the front of the music system with this cable, as this is the only volume controlled output on this music system:-

A step in the right direction now :)
I borrow a short version of this cable from a friend, and sound was much lower now, but still a tiny bit to loud on lowest volume setting and no not quiet ideal to plugin in a cable at the front of the music system. 

thanks, ill try one of the smaller preamps..