Axiom Home Page Forums General Discussion Home Theater Denon AVR-3313 - Sound not as good as I expected

Hi,
I have an AVR Denon 3313 since a few years.
Over time, I started adding Axiom speakers around it.
So far, I have:
Main = M80 v4
Center = Vp150
Rear = QS8 v4
Even though it's good, I don't fell it is that good. When I'm reading comments from many of you, I can't say I have those goose bumps when listening to music or movie.
Even in plain stereo mode with onlya main speakers ON, I feel I'm missing some low end. And if I crank it up, it's even worst. Like all high frequencies are very at high level and no low frequencies. Like it's not a warm sound.

I'm sure I can bring this setup to a better point, but where do I start ?

A power amp ? My Denon have pre-amp outputs.

Thanks for your thoughts about my setup !