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Might be an idea to use some self powered wedge monitors. Conventional small PAs used as Vocal PAs in small rehearsal rooms tend to be a recipe for feedback, and the vocalists often can't hear themselves. You could also convert a small PA into a mono vocal PA using one of the channels as the monitor for the vocalist on the floor like a wedge (often cheap stand mount PA boxes are designed to work both ways, eg: mackie, but with a few concrete blocks and some carpet or foam you can probably get pretty much anything to rest on its side at an angle), and the other side on a stand facing away from the vocalist for everybody else to hear. In the 1960s and 1970s it was common for the vocalist to have a mono backline amplifier much like a guitar amp to sing through at live shows.
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