I like this chart from the PSB website. I believe that all frequencies are important. There are orchestra pieces that go down to 16 Hz and some that are only going down to 30 Hz. I believe that there are harmonics above and below the principle tone that are important and anything less is a significant compromise. Add a sub to get that low (integration difficulties assumed).
website:
http://www.psbspeakers.com/audioTopics.php?fpId=8&page_num=1&start=0
website:
http://www.psbspeakers.com/audioTopics.php?fpId=8&page_num=1&start=0