Y-Cable

Hi

I'm using 4 monitors,
one mackie 1604 mixer and mpc2500

I wanted to connect all monitors to my mixers output, so I bought
1/4" Y cable adaptor (both female mono).

I connected 4 monitors through adaptor to mixer's C-R out

while I was listening to the music, the monitors on the right side started to make noise.

the volume got very low and now I can't hear anything but buzzing on my right side.

I've checked with my headphones too, but I think the problem is in the mpc.
cuz it happens with my headphone too.
very low volume on the right side and I can only hear buzzing.

I shouldn't connect the Y-cable? did that cause the problem?

I heard Akai doesn't do the A/S for the products, what should I do?
I bought it in Samash.


HELP.................................