I don't know what "the new model" means, and your pics aren't loading for some reason.
As I said, read the model and series number off the label/plate on the Acoustimass module.
The last manual our friend Ratman linked to (AM-5/AM-10 Series V) shows two dials
for "Bass" and "LFE," not buttons
Since you appear to have the model with a discrete blue line for the LFE output of an AVR, plug one end into the SUB OUT on the 681, and plug the other blue line end into the appropriate connection on the Acoustimass module, as per the Bose Acoustimass owners manual supplied with your speakers
. Next, follow the instructions in your Yamaha RX-V681 owners manual to run YPAO room measurement
; this will detect the LFE connection and set the level automatically.
As we've both said, read the manuals
for your equipment. If English is not your first language, see if you can find them in your native language.
I'm outta here. Removing my previously incorrect responses due to new information.