Originally Posted by thorix
thanks bob for the info,
is it right, that if I set the Subwoofer to off, there will be no signal coming from the SW analog out, and the LFE signal is mixed into analog FL, FR but also into dedicated stereo R and L
Not quite. This is a little complicated.
First, LFE content is discarded as part of the down-mix for the Dedicated Stereo Analog outputs (when Stereo Signal = DOWN-MIX STEREO is set). The reason why will become obvious in a moment.
For the multi-channel Analog outputs (which includes the case of the Dedicated Stereo Analog outputs reconfigured to act in place of the normal LF/RF outputs of the multi-channel set -- i.e., Stereo Signal = FRONT LEFT/RIGH), if you set the Subwoofer to OFF then LFE content is presented, attenuated, in the LF/RF channels.
Now the problem is, allowing enough headroom for LF/RF to carry that LFE without clipping the input of your pre-amp means that rather a lot of attenuation is needed. Which ALSO means the other Analog channels have to be attenuated so that they stay in balance with LF/RF and the LFE component they are now also carrying. This raises the noise floor. I.e., the content signal is now closer to the base noise level, and when you raise Volume to make things loud enough again you are also amplifying that noise.
That's the whole thing about LFE. The reason it is set aside as a separate channel is to have a place to put LOUD base. If you try to mix it into the normal channels, something has to give.
So that's why it is not included in the down-mix for the Dedicated Stereo outputs.
Now, it IS retained (in LF/RF) for the multi-channel output for folks who really WANT to have it. But if you would prefer to discard it, you can set Subwoofer ON and the other speakers Large and simply not plug anything into the Subwoofer output jack.
Of course far and away the best solution for LFE is to have a Subwoofer.