custom display cuts out at higher volume

I made a custome display for customers to see units light up.

Its not the best but it works. My problem is that when i turn the gain up on the bass the system losses power and starts to fade and most of the times it turns everything off then back on, but i got to turn the gain down. I have a convertor for up to 15V hooked up to 2 cap's then into 1200W amp 2 channel and 600W amp 4 channel. Im i missing something here for it not to do that. Oh and im using 2agw all around. Thanks

Thanks for the quick reply.

Wll im using a Pyramid PS-52KX https://www.bellscb.com/products/testequipment/Powersupplies/pyramid/pyramid_PS-52KX.htm

Then i got both (+)post to fuse block, then in to the cap's 1.2, 1.5, and 2.0 Then it ditributes power to the amps, The pyramid powers all the screens as well, 4 of them 7", 8", 10" and 13"can i add a battery to it. i got it set at max 15V. Cap's read 15.0, 15.44, 15.2 when at "0"volume, starts fading at "18" volume and cap's star reading 10.2.

It would help if you added a battery as the battery would act as a buffer supplying peak current when the power supply maxes out.  You just need to make sure you don't over charge the battery.