Ok, heres the problem I am having: suddnely within the past I would say the past 2-3 weeks; the sound went out on my center channel speaker. So, I called klipsch tech support and they told me to test the sound card by plugging a pair of headphones into each of the connectors that the 3 cables plug into on the back of the sound card where the center/sub cable, right rear and left, and front left and right cables plug into. Well, I did this, and I get full, vibrant sound from the front left and right