Originally Posted by psraj
So the correct settings should be 0 dB for the LFE in the XA2 and +15dB in receiver. I read some other post that mentioned setting the XA2 to -10dB and 15dB boost in the receiver. Is that necessary?
No, and it's actually a bad idea. The bass management algorithms in the XA2 lower the output levels to the point where maximum output will not clip. Thus, when you lower outputs in the XA2, you actually raise the noise floor.
You should only lower the individual speaker output settings in the XA2 as a last resort.
It would be far more desirable to go with all of the LFE boost in the sub amp, if possible, and any necessary cuts to the other speakers to be done in the receiver.
[Reasons: 1) Adding the 15 dB boost in the receiver has the potential of overdriving the input of the sub amp, or clipping the sub output from the receiver. If you can simply turn the gain up on the sub, you avoid this potential distortion. 2) Lowering the gains of the other channels as late as possible (in the receiver) maintains the best possible S/N performance.]