On my kenwood receiver vr 707... I'm having difficulties in getting any base for subwoofer. I pluged in the "subwoofer pre-out" like it says in the manual but it seems as if there's no power going into that line.

Hi,
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You have to set the subwoofer setting in you system .for that do the following.

1 .For the remote control, press and hold the TUNER key for more than 3 seconds to switch to receiver mode.

1. Press the SETUP key to enter the SETUP mode and select SETUP SYSTEM using up arrow or down arrow
   

2. Select SP SETUP and press the SETUP key again so that the speaker system indication "SP SYSTEM" scrolls across the display.
   

3. Press up arrow or down arrow to select OTHERS and press SETUP key
   

4. press the up arrow or down arrow to select the SUBW ON and press SETUP key
   

   exit the setup and try. Is the subwoofer is working or not