Please help - poor sound from freshly installed Ground Zero speakers

[sneykinko]

Hello all.

I´ve got one problem. I had in past Ground Zero Iridium GZIF6503X 3-way speakers. Best I ever heard. 16.5CM... And I had LG stereo with them in past.

Now I´ve bought similar newer speakers - Ground Zero GZAF 16 16.5 CM 3-Way Coax Speaker 80 / 120 W. And I have also KENWOOD KDC220U stereo (which worked very well with stock 25W Mazda 3 speakers)...

Well... After installing new GZ Audio speakers I am disappointed with sound. It plays, but very often I hear grunting or scroop from it.

So where should be a problem? They are 80W RMS. My opinion was that KENWOOD stereo doesn´t giving enough power? But anyway it should play cleanly... Or should I try to switch + and - wires at speakers contacts?

Please help. I really don´t understand why They´re playing so poor...

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