Want to have speakers play sound from multiple Inputs

[hhchow]

My school is doing some renovating, our computer classroom had a sound system. We want to make some minor changes so that the speakers can play sound from PC, and at least 1 AUX at the same time. It would be highly appreciated if someone knows how to connect the system together as we are no audio professionals.

Our system has a commercial processor (top), stereo leveler (middle) and power amplifier (bottom).

We mainly don't know how to connect the commercial processor.

Picture of our system, front and back.
Front

Back

 

[americanaudiophile]

Of the three you only need the amplifier. What you don't have is a stereo mixer that you can connect the PC and Aux inputs to.
https/www.amazon.com/Rolls-MX42-Stereo-Mini-Mixer/dp/B00102ZN40/ref=br_lf_m_9fvkynxqvhwg6aa_ttl?_encoding=UTF8&s=musical-instruments
These have RCA unbalanced outputs and the amp has TRS 1/4" or XLR balance inputs so you need 2 cables like this
https/www.amazon.com/Monoprice-Connectors-Shielded-Oxygen-Free-Conductors/dp/B001VLW398
to connect them.