KCB:

Simple enough to verify:

Play a digital multi-channel disc.

Set all 3 X-overs to 120 Hz.

Shut the 5 sat's amps off and just listen to the sub.

Switch the FL/FR X-over to 40 HZ.

If you still hear 120 Hz., you and Scott are correct.

I've studied Cirrus' block diagrams and read their papers. Unless they built something different from what I've read, the LP is determined by the mains filter when sats are set to 'small'.

Tell me what you think?

" [Ex.: Dolby Configuration 1 (all sats set to 'small', SW to 'yes')], Bass Manager 505 is enabled with the following paths enabled or disabled. The direct LFE path to the output through summing module switch 805 is disabled and the path through summing module 802 and Low Pass Filter 803 enabled. The direct LFE inputs to the Processing Modules are turned off."

IOW, the LFE 120 Hz. filter is used when all sats are set to 'large' wherein the LFE has a direct path to the SW output, through the filter. As soon as you set sats to 'small', this path is disabled and the LFE is routed to a summing module, summed with redirected bass, and then sent to the selected LP filter.

The listening test is the easiest way to tell if you're getting 120 Hz LFE to your sub. The difference between 40 Hz and 120 Hz is something anyone can hear rather easily.

I truly am baffled by the resistance I get, everywhere I say it, but I'll say it again. How hard would it be to have a seperate LFE output with NO filter that feeds a seperate LFE sub? Every sub has it's own filter. Include a switch to sum it for those who just don't care or only have 1 sub. LFE discrete: 'yes' or 'no'. (DUH)