Originally Posted by KurianOfBorg
I know that. I am going to use the "Sub Out" from the receiver, but it's speaker level, not pre-out. Can I safely connect this to the "Sub In", or do I have to connect it to just one of the L or R speaker inputs. Can the "Sub In" handle an amplified input?
Sorry, KurianOfBorg! I don't know your equipment or your level of expertise. I'll try again.
If you use Receiver "Sub out" to F12 "Sub in" it is safe. If you use the receiver's "Sub out", the receiver manages everything. Do not connect L&R speakers to the F12 when using receiver Sub out. The crossover on the F12 will be bypassed so only F12 sub volume will be active.
On your receiver you will need to go into your Bass Management menu, then select what bass frequency you'd like for crossover. If your L, R & surround speakers are small, try 80db -100db. If larger try 60db. Try several & go by what sounds best to you. Your receiver will manage audio frequencies from there. Your receiver should also have an independent speaker volume level menu to calibrate all speaker levels including the F12 sub but you will need to set the F12 volume to a starting point. Use that to balance volume levels for best surround effects.
If this helps, great, but if not we'll need to know what receiver do you have & go from there.