2K Club - QQ Super Nova
- Jul 2, 2003
- in your face
Quite so, but I hope no one in this thread is confusing an LFE channel with a subwoofer, for all the reasons you cite.An LFE is not the same thing as a subwoofer is. I cannot overstate the importance of the distinction between the 2 any more than by linking to the Dolby Professional document that describes the reality.
Subwoofers are loudspeakers for outputting low frequency sounds. Those sounds can be the (low frequency) contents of an LFE channel, and/or low bass derived from other channels. A sub isn't designed for full-range input or output. (and an LFE isn't 'meant' to have full range contents).
But for better or worse, non-filtered LFE appears to be standard in the music-only BluRay releases I've checked, and as I note, it's present in quite a few DVDA and SACD releases as well. It's up to us consumers to deal with it, apparently. Since systems with subwoofers typically have a lowpass filter somewhere before subwoofer output, the users most 'at risk' for unintended playback effects are those who don't use a subwoofer, who fold the LFE into the main channels.
It's especially curious to see tracks using the 'correct' LFE practice mixed with others using full-range LFE on the same release (Brain Salad Surgery DVDA, released 2000 and then again on SACD in 2008).