I'm not sure what you mean by punch, but I've ran there D-series, Micro and Macro Tech series and the CTS series. And all of them sound great on Bass-reflex speakers. I haven't ran there cheaper amps yet, but the only thing is you can't go under 4 ohms per channel on them, which wouldn't matter if you're just running a set of pi 4's.Don't put QSC's on them because they'll sound kind of thin, meaning not real well rounded bass freq., there to sterile sounding IMO. I rate my Pro amps like this, Crown/Crest tied for first, 2nd QSC, then Carver PM series 3rd. That's out of the American brands.
HTH
Bill W.