I have a customer that wants to be able to turn on / off the LFE output on his Lex Processor. I have not found any IR or serial codes yet for this particular aspect of the MC12. I could put a Xantech RGC11 in line and simply control it that way, but I would rather not. Has anyone come across any RS232 or IR codes for this particular function?

What about A Xantech AC-1 and just turn off the sub?? or if the sub has a 12v trigger, loop it thru a relay on the RP-6...Im assuming your using RTI and power up the sub with the 12v trigger.

We are doing a RGC11 on a system to control the Butkicker amps some movies they get way out of control...it has a volume as well as 10 presets...we are going to set it up with 5...low, med-low, med, med-high, high, we are also using AC-1's to control the power on them

Well I would normaly do that but I am using an earthquake cineova seven to drive 4 subs and 3 butt kickers [Link: earthquakesound.com]
The customer just wants to shut off the LFE while his wife is watching movies (she hates butt kickers) so if I use the 12 volt trigger it will shut down the subs as well, I was just hoping since lexicon has such a robust control sceem that a way to control the LFE was some how available beyond external means. running the buttkickers off the lexicon LFE is just a dream, this is the first time I have tried using a single hi powered multi channel amplifier to drive all of the subs and the butt kickers together and I have to say it makes a HUGE diference, this is the tightest setup I have ever experienced

I can't seem to get into the Lexicon site right now to confirm with the document, but I am nearly 100% certain that you have control over the sub output(s) and LFE through RS-232...
I found the OM in an ancient folder in my laptop, but I could not find the control document. There wasn't anything useful about this in the OM, but I would imagine you and your client knew that already!!

I will keep looking...

The wife hates the buttkickers. Your primary goal is eliminate the kickers when the wife is present. But, eliminating or attenuating the LFE output at the preamp will also impact the subwoofers if they are receiving the LFE signal.
If the above is OK, then assign a DTS and DD surround mode (the only modes that have LFE signals) for use when the wife is listening. Use one additional input that is on the Lex processor and assign default modes for DD and DTS that are different than the current default for the husband's use. Under the assigned modes-adjust the modes to to maximally attenuate the LFE channel. For DD-you can also turn on compression under that mode.

Add one macro to your remote programming "spouse movie mode", linking to the LFE attenuated input.
Of course, the above only applies to one source.

My choice would be to use an inline attenuator only for the BK feeds.

Curiosity, how are using the sub/lfe outputs from the MC12 with 4 subs and 3 BKs.

MC-12 has to subwoofer outputs which are split into 4 channels on the the Cinenova 7 amplifier. the mono LFE output is split into 3 of the Cinenova amplifiers channels

May we assume the LFE is set to yes and L/R are being used in stereo mode?

The Left and Right subwoofer outputs are split to feed four channels of the Cinenova amp that feed which transducers?

Which transducers are fed from the 3 Cinenova channels that receive the LFE output?

The LFE is only feeding 3 channels that are in turn driving the 3 butt kickers. Sub - left / right is feeding 4 sub woofers

I am begining to think I should just use an RGC-11

The way the subwoofer system's software works in the Lexicon, if you were to change the speaker setup to LFE=No then the LFE information would be redirected to the L/R subwoofers and summated either with a Mono L/R combined signal (selectable in the software) or Stereo left and right.
I am also concerned that full LFE signal bandwidth is being sent to the BKs, and not being sent at all to subwoofers. Once you set LFE to yes in the Lex, the Left and Right sub outs do not contain any LFE signal. The BKs are a nice product, but I have found them obtrusive when not aggressively low pass filtered at about 35-40 HZ as their resonance frequency is at 9hz. In addition, your 4 subs are only receiving redirected bass information below the crossover point for the main channels and none for the LFE. This leads to significant audible loss of LFE information which can be up to 120hz for DD (or higher if they do not engage the filter in the DD encoder) or substantially higher for DTS (Steely Dan-2 Against Nature has information up to 800hz in the LFE channel). The majority of LFE energy is in the audible range.

Please feel free to contact me via email, as I have setup 3-4 systems like you to describe with multiple subs and BKs/Clarks.

I appreciate your input and experience with this product.

I just want a simple one-string command that turns the LFE on or OFF as the case may be, without having to navigate through an entire process of commands, nor would I like to switch to a different surround mode. The subs are crossed over a 60Hz and sound tremendous all by themselves with the LFE turned off physically at the amplifier. I was not aware that you would get higher frequency information into the LFE circuit even though the crossover point is set to a much much lower value. I do understand that the majority of LFE content hinges upon what comes with the given disc. However I have listened to a bunch of audio tracks from the 2006 DTS "Alive" Test disk I have recently received from DTS, and have found no ill LFE content yet. However I must say the "Robots" Demo is pretty amazing on this system, the combination of 4 elliptically placed subs and butt kickers gives you the real sense acceleration and deceleration, as well as flying through the air.

F1 07 36 18 AC 01 00 01 F2 This turns it ON

F1 07 36 18 AC 01 00 00 F2This turns it OFF