ECS KN1 Extreme - Only hearing sound from 2 Speakers (I ha..

I have an ECS KN1 Extreme and I downloaded the NVIDIA Sound Card
Drivers/Software - which installed fine.

I have Logitech Z560 4.1 Computer Speakers (has 4 speakers and a
subwoofer). It has a green connector and a black connector for sound.

I plugged in the green connector into the green connector on the
motherboard and the black connector into the blue connector on the
motherboard. In the NVIDIA Mixer Program, I set the number of speakers
to 4 and change the blue connector from line in to Rear Speaker Out.

I can hear sound from the 2 rear speakers fine, but I do not hear any
sound from my 2 front speakers nor my subwoofer.

Any ideas?

Thanks!