Hi there.
I had a similar problem some years ago and i solved it by buying a Behringer Ultralink. I think they cost a little over 100 quid and are perfect for your requirements. They take a stereo line in (XLR) and provide 10 outputs, each is amplified so there is no loss of sound quality – and as each of these outputs has it’s own seperate volume control it is perfect for balancing the different power handling capacities of each individual speaker.
It also has lots of nice lights on it…
You should easily be able to find the Behringer website (you’ve probably come across their equipment before) it is pretty good quality gear…
Hope this helps..

Garglebard

Have you not got outputs on the backs of your amps so that you can chain the signal? Most amps have them.

You can use Y-splits once or twice but, like you say, it does reduce audio quality if you use them more than twice in a chain.

We’ve been using the Ultrlink for a while (think we picked it up for £70) now to control the monitors and the sub bass and it’s worked brilliantly. Although some people say that Behringer make poor quality stuff and it should be avoided. Personally I find it good for the price. But I think the main problem people have with it is that they tend to completely rip off other peoples designs and then build theirs in foreign factorys with cheap labour and parts. It’s a question of ethics more than anything I suppose.

If you are feeling a bit more flush then have a look at Sonifex stuff. They make a distribution amp that does the same job, but is of higher quality. Sonifex DA8 I think it’s called.