ALPINE car audio. Why are my speakers less loud than when I had in my stock system?

[Patten 37F]

I have all Alpine everything in my 350z just had it professionally installed. A PDX-5 channel Alpine amp. The sub runs fantastic. But my type R 6x9s and front speakers are literally weaker than a stock tape deck with No amp. I've tried crossover, equalizer and center/rear balance through the head unit. All wires securely installed. HU is a CDA-9855 Thanks. -Sgt Patten