The .1 is adjustable up to a certain point, and the 5. are full range?
Not really. The .1(lfe) tracks bandwidth range is 3-120hz. In your HT you can trim the top of that off with the lpf of lfe. This might be done to reduce localization, or just because of preference, but most will leave it at 120hz. The other 5 channels usually don’t carry much content below about 30hz, but Could actually be mixed with lower content. The greater majority of speakers don’t do well that low so there’s not much point. That’s one reason why we cross over around 80(a few others too). All of the bass below the XO frequency(we’ll say 80) goes to the subwoofer from the main channels but does so independently of the .1 channel. Music contains no such extra channel so all the bass from your music that goes to the subwoofer comes from below the XO point.
So to your question, basically the.1 is adjustable by removing the top of the signal, and the rest are adjustable by removing the bottom. However due to limitations of many subwoofers, you’ll likely see 20-120hz subwoofer performance since many(definitely not all) won’t do justice below 20.
