My old band used a Peavey PA for everything and it was plenty loud. We never turned it even half way up. But the vocals were always weak compared to quartets and such that come to my church. They alway bring their own equipment (I'm talking different groups, not just one) and their vocals alway sound so full and present compared to ours. We use SM58s. That old band of mine also played through the regular PA at the church and again the vocals were weak compared to these pro groups. Now I'm in another band and the PA we're using is an ancient Holmes PA but we don't even turn it up past 3 and we're only using it for vocals. Same thing, the vocals are weak. Now, we don't gig, we just play for fun so I'm not looking to spend a fortune. What would I need to achieve the kind of quality vocals these groups have with the equipment I've already got? Compressor or some other kind of vocal processor? Subs? We're playing through two 15" mains now. Thanks!