We are a bunch of past middle-age friends who pretend to be a band. We started doing small open-air gigs where we use a single 80W (RMS) PA system as our output into the small crowd. To minimize audio feedback issues, we use cardoid and super-cardoid mics and also place the PA speaker about 10 meters ahead of the stage. This has led to a situation where we've started feeling the need of stage monitors, to hear each-other -- especially as use an acoustic drum-set which without the monitors, drowns out the mic'd acoustic guitar (for the musician).
We were thinking of using my spare 15W guitar amp-speaker combo as the little stage monitor. However, our 8-channel analog mixer supports only 1 output (6.3mm unbalanced), which is used to connect to the PA system. Wondering then, how can I also connect to my stage monitor in this setup ?