Does this help? From: http://www.extremetech.com/print_article/0%2C3428%2Ca%253D1531%2C00.asp
“The LFE channel is independent of the main channels and is created by decimating a full-bandwidth input bitstream using a 64x or 128x decimation digital filter, yielding a LFE bandwidth of 150Hz or 80Hz respectively. ADPCM coding is then applied.”
From: http://www.snout.org/movies/bam-sound.shtml
BAM: Theatrical Digital Sound Formats

Dolby Digital (DD)
http://www.dolby.com/digital/
Up to five full-range channels (L-C-R-LS-RS @ 20Hz-20kHz) and a 20-120Hz LFE channel in a 384 kbps (kilobits per second) bitstream (a single line of digital data) (Note: bitstream on a movie filmstrip is 320 kbps; DVD uses up to 448 kbps)
115 dB dynamic range for LFE channel; 105 dB dynamic range for the other channels

DTS Digital Surround
http://www.dtsonline.com/
Up to three full-range front (L-C-R) channels, two 80Hz-20KHz surround channels and a 20-80Hz LFE channel in a 1544 kbps (or 1.544 Mbps) bitstream (laserdiscs use two bitstreams that add up to 1.544 Mbps)
Resolution: same as Dolby Digital
96 dB dynamic range
Up to five full-range front channels (L-LC-C-RC-R), two full-range surrounds (LS,RS) and an LFE channel (frequency range should be similar to Dolby Digital's); no information about bitrate on hand
96 dB (approx.) dynamic range