Headphone amp useful here?

[svemal]

So here's the deal.

(Im not very familiar with audio setups, so please excuse my incompetance)

 

I got two Logitech Z906 systems mounted in a caravan me and some mates use at festivals during the summer.

 

The systems are connected thusly:

Phone connects to a MyJack bluetooth-to-aux reciever, sending it's signal into a "Music X2 controller" wich uses the AUX signal and a 230V to 12V 150W converter to power a long strip of LED's (synchronized to the music).

The aux cable continues via the music controllers output, going 2 meters before reaching a Y-splitter, going to the 2 different Z906's.

 

I'm contemplating splitting the signal via another Y-cable (before it reaches the splitter mentioned above), to power 2 of those tiny "water-dancing" speakers, just for the little extra ligthing.

 

Question here is: does a phone output a strong enough sound signal to provide  a z906 with it's recommended signal strength? Does it even matter when the speaker has a built in amp?

Does it still provide sufficiently with an aux-splitter (how much does it weaken the signal).

I do feel like the systems play alittle quietly...