Originally Posted by citsur86
Originally Posted by PlasmaPZ80U
Hope everything is alright with the sub. I noticed that when using the LFE input on the sub, the YPAO test tones had a rattling or clattering type sound. Not with Line In, though. Probably has to do with LFE bypassing any sub LPF.
What is sub LPF?
The low pass filter (crossover knob and lpf slope switch)
By the way, when you get REW you can do compression sweeps (carefully) and determine at what volume setting on the AVR the sub starts compressing at 20Hz.
Also, keep in mind that MCACC could be setting the sub a bit hot all on its own (YPAO sets mine 6-7 dB hot all on its own) AND that bass management adds to the LFE too. And the more speaker channels you have the more bass management is sent to the sub. All these things can make the sub play louder than it would otherwise.
So, how loud the sub plays is based on whether the sw trim is running hot and by how much, the number of bass managed speaker channels, and obviously the AVR master volume (MV).
And regarding bass management, if you don't use upmixing, 2.0 has 2 channels of bass management, 5.1 has 5, 7.1 has 7, etc.
So, a 5.1.signal will have the sub playing more softly than a 7.1 signal by a few dB.