Originally Posted by Nexgen76
Yeah thinking that's the issue also.....I have the Yamaha-RX-V675
Nexgen i've got the same setup as you. Running F-30's as my front speakers through a Yamaha RX675. Also have the klipsch sw-450 sub which is a beast.
At first I was disappointed with the sound quality, particularly the vocals since they seemed muted coming from the F30s. After some tinkering with the 675 settings i'm very pleased with the sound quality and think you will be too.
To specifically address your question, the bottom set of terminals are the main connections and should be run to your L and R front channels on the receiver. The top set of terminals are for bi-amping the speakers which is optional. I do currently have mine bi-amped and think it helps bring out the vocals a bit more so worth a try. Just remove the jumpers (the gold brackets) then connect the top set of terminals to the L and R biamp channels on the back of the receiver. Believe these are labeled L/R Surround/Biamp so should be easy to identify.
A few other thoughts that dramatically improved the sound quality for me:
1. Use the YPAO mic to run an initial setup on the speakers, just place the mic in the middle of where you will do the majority of your watching / listening and hold it about ear level.
2. Go to Setup -> Speaker -> Manual Setup -> set Parametric EQ to Natural
3. If you have a subwoofer i would also set the F30 speaker configuration to small. This has been a well documented issue of how the 675 handles subs. Also set the Bass Cross Over to 80Hz. You should then disable any cross over settings on the back of the sub since you want the receiver to handle the processing.
4. Options -> enable Adaptive DRC
5. Dialogue Adjust -> set dialogue level to 3
6. Options -> turn off Enhancer
7. I also have Sound Program set to Standard
hope this helps.