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The original was posted on /r/hometheater by /u/unicyclegamer on 2023-12-30 05:09:37+00:00.
I’ve been reading up on the difference between these two options, and I’m confused.
This page from Denon makes it seem like it has to do with playing frequencies NOT only in the LFE channel, but also from the L/R channels.
https://support.denon.com/app/answers/detail/a_id/14856/~/difference-between-lfe-and-lfe%2Bmain
LFE or Low Frequency Effect is the low frequency that’s output from any native Dolby, DTS or Auro 3D encoded track. It makes up about 8-10% of the track and is typically in the 20 Hz – 120 Hz range.
The other option you can choose is LFE+MAIN. This option includes the LFE from the Dolby, DTS or Auro 3D track and adds any low frequency that’s sent to the other channels under that channel’s set crossover point. It is recommended that you set your AVR to LFE+MAIN when playing back from any analog based source or when decoding a PCM based source for your subwoofer to output any of the low frequency from those sources. This ensures that your AVR will provide a full and balanced tone no matter what is being decoded or output.
But then they have a page for setting speakers to small/large and it seems like they’re using the setting to also mirror those low frequencies on both the sub through LFE, and the L/R, but only if the fronts are set to large.
https://support.denon.com/app/answers/detail/a_id/48/~/speakers---large-or-small-setting
As most surround applications use at least one subwoofer, you may want to set the Front, Center, Surround, and/or Surround Back speakers to "Small" regardless of their capabilities to take advantage of using the receiver's internal crossover. This will allow all frequencies under the crossover point (i.e. 80 Hz) to be generated from the receiver's SW pre-out to the subwoofer used in the application. This should create a more overall balanced audio experience.
Of course, for those front towers with internal subs or if you're only using a 2.1 (Left, Right, Sub) setup, you will most likely want to leave the Front speakers set to "Large" to pass the full frequency range (20 Hz - 20 kHz) to the Front speakers. At that point, you will want to change the Subwoofer Mode setting to "LFE + Main" as that will distribute low frequencies and LFE (Low Frequency Effect) to the Front channels and SW pre-out.
From what I understand, it goes like this:
L/R set to large and LFE - L/R get frequencies from their respective channels, but nothing from LFE. Sub gets LFE
L/R set to large and LFE+Main - Low frequencies go to both L/R and sub, regardless of channel
L/R set to small and LFE - L/R get frequencies down until their crossover points, sub gets only LFE channel
L/R set to small and LFE+Main - L/R get frequencies down to their crossover points, sub gets LFE along with low frequencies from L/R channels up until their crossover points.
Thoughts? Based on this it seems like LFE+Main is the better option if your speakers are set to small. If your speakers are set to large, then it seems like it depends on if your speakers and sub overlap well or not.