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With the apparent demise of the SMR forums I thought it would be a good idea to have a source for information on the set-up and operation of Lexicon HT processors. Even though Lexicon has fallen behind on the latest technologies their processors are still very impressive performers and are owned by many forum members. I believe the MC-12 platform will be a classic. I personally own a MC-12B v5.25 EQ, and, a DC-1 v4 (presently in storage). Along with the analog outputs of my Oppo BDP-103 Blu-ray player I am able to enjoy the latest codecs.


I'll be the first to post a question regarding the Lexicon's bass management: I use only one sub, a Seaton Submersive. I have it connected to the left subwoofer jack, and, have the LFE turned off in the set-up menu. This is what is recommended. However, and this is what I am unclear on, with the LFE turned off where does the LFE program material go? Is it routed to the L/R subwoofer outputs?


David
 

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let me get this straight...


you have a pre/ pro that recommends not using the LFE input supplied...and turning off the LFE in the setup menu



why do they recommend that?
 

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Discussion Starter #3

Quote:
Originally Posted by lefthandluke  /t/1462996/the-official-lexicon-processor-thread#post_23073450


let me get this straight...


you have a pre/ pro that recommends not using the LFE input supplied...and turning off the LFE in the setup menu



why do they recommend that?

Well, you can see why I am a little confused.


This was a suggestion by a member at SMR forums based on my situation. The Lexicon has a pretty sophisticated bass management system, which, can be configured various ways depending on the number of subs in use, how the subs are used (stereo, single, LFE), and where the speakers are crossed over to the subs.


I was looking for suggestions from other Lexicon users, who may be using a single subwoofer, as to how they have their subwoofer connected. I am using Aerial Acoustics LR5's for L/C/R which I have crossed over at 80 hz.


David
 

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Quote:
Originally Posted by lefthandluke  /t/1462996/the-official-lexicon-processor-thread#post_23073450


you have a pre/ pro that recommends not using the LFE input supplied...and turning off the LFE in the setup menu


why do they recommend that?
Because the pre-pro has 3 outputs for subwoofers: Left Sub, Right Sub, LFE. That last one outputs only contents from the LFE channel, assuming the source has a .1 channel. If there is no .1/LFE channel in the source (like on a 2-channel CD), then that output is silent.


For folks who don't want to use a separate subwoofer dedicated solely to LFE duties, they can turn off LFE in the menu and the contents of the .1/LFE channel will be sent to the Left Sub and Right Sub outputs.


For folks who don't want to use more than one subwoofer, they can flip a switch in the menu to turn the stereo subs to mono, so that the same content is sent to both outputs (connect your single sub to either output).


Keep in mind that subwoofers get bass from 2 sources: derived bass that has been filtered from any channel set to small, and discrete bass from the discrete .1 channel. Just because there is an option to have a dedicated LFE subwoofer doesn't mean you are required to use one (the contents of that channel will simply be routed to the other subwoofer outputs).
 

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Discussion Starter #5

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Originally Posted by sdurani  /t/1462996/the-official-lexicon-processor-thread#post_23077204


Because the pre-pro has 3 outputs for subwoofers: Left Sub, Right Sub, LFE. That last one outputs only contents from the LFE channel, assuming the source has a .1 channel. If there is no .1/LFE channel in the source (like on a 2-channel CD), then that output is silent.


For folks who don't want to use a separate subwoofer dedicated solely to LFE duties, they can turn off LFE in the menu and the contents of the .1/LFE channel will be sent to the Left Sub and Right Sub outputs.


For folks who don't want to use more than one subwoofer, they can flip a switch in the menu to turn the stereo subs to mono, so that the same content is sent to both outputs (connect your single sub to either output).


Keep in mind that subwoofers get bass from 2 sources: derived bass that has been filtered from any channel set to small, and discrete bass from the discrete .1 channel. Just because there is an option to have a dedicated LFE subwoofer doesn't mean you are required to use one (the contents of that channel will simply be routed to the other subwoofer outputs).

Sanjay-


Thanks for clearing my confusion. I was not aware that bass from the LFE channel was routed to the L/R sub outputs when LFE is set to off.


David
 

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Discussion Starter #7

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Originally Posted by bo130  /t/1462996/the-official-lexicon-processor-thread#post_23078255


Did you buy the Oppo unit that Lexicon put their faceplate on?

No, I bought the Oppo unit that Oppo put their own face-plate on. Anyway, why does that matter? Is Lexicon the first and/or only company to do that? Other companies trade technologies and put their own brand-names on other's products.
 

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Using MC 8B. Question is whether the unit should be in 'Standby mode' rather than turning off at the rear power switch. Use the unit most of the time.
 

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Quote:
Originally Posted by jdlynch  /t/1462996/the-official-lexicon-processor-thread#post_23077365


I was not aware that bass from the LFE channel was routed to the L/R sub outputs when LFE is set to off.
Sure, where else is it going to go? And if the system is configured with no subs, then the LFE channel is routed to speakers. This is common to most receivers and pre-pros, not anything unique to Lex.
 

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Discussion Starter #10

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Originally Posted by Gideon  /t/1462996/the-official-lexicon-processor-thread#post_23079682


Using MC 8B. Question is whether the unit should be in 'Standby mode' rather than turning off at the rear power switch. Use the unit most of the time.

Using the main switch to cycle the power is wearing on the power supply. If you use your MC-8 on a regular basis I would recommend using the stand-by button. I would only use the main switch for longer down-times.
 

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Quote:
Originally Posted by jdlynch  /t/1462996/the-official-lexicon-processor-thread#post_23080747


Using the main switch to cycle the power is wearing on the power supply. If you use your MC-8 on a regular basis I would recommend using the stand-by button. I would only use the main switch for longer down-times.

Thanks...
 

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My two THX Ultra2 subwoofers are placed at each rear corner of the room which is about 1 to 2 feet away from the acoustic wall with bass traps. Should the Boundary Gain Compensation be turned 'off' or 'on.? Secondly, since playing high definition sound, should the Bass Peak Limiters be used? According to the manual, it is meant for DD & DTS (ES) sound. Any experience and advise is greatly appreciated.....
 

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Yes, I would turn Boundry Gain Compensation off.


No need to use the Bass Peak Limiter unless you hear your subs distorting.
 

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Quote:
Originally Posted by sdurani  /t/1462996/the-official-lexicon-processor-thread#post_23082969


Yes, I would turn Boundry Gain Compensation off.


No need to use the Bass Peak Limiter unless you hear your subs distorting.

Thanks, Sanjay.....
 

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Discussion Starter #15
I have my MC-12B EQ v5.25 system set-up as 5.1 speakers as my listening spot is directly against the rear wall. I dont have enough distance to use the 7.1 as side speakers.


I am wondering if I could use the side speaker outputs as front height speakers? Has anyone tried this, or, does anyone have any input as to how this arrangement might sound?
 

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Have similar setup like yours 7.1 with sitting sofa against the rear wall. Just calibrate accordingly with SPL meter to each of the speaker placement, with measured distance for each of them too. So far, so good even though it might not be ideal for music listening only. However, when I played with 5.1 analog bypass, I would forgo the rear speakers....sad...But this only happens when I am watching movie via analog sound....
 

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Want to share something....My MC 8B since 2004 had replaced the power card twice as the unit was behaving strangely with repeating diagnostic sequences....Lately, it also had similar behaviour. Rather than having the agent to replace it again...opened the cover, sprayed with Electrical Contact Cleaner, the internal electronic contacts as well as the connecting cables to the electrical boards...and lo & behold...it is up and running as though as there is a new life..with no more repeated diagnostic problem....Have been running it for the past few days and it is fine! Wondering if anyone had similar problem and how did it got rectified?
 

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Anyone knows when is the replacement for the MC 12 HD yet? Supposed to be last year but seem to be lost in transition.....
 

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Quote:
Originally Posted by jdlynch  /t/1462996/the-official-lexicon-processor-thread#post_23090299


I am wondering if I could use the side speaker outputs as front height speakers? Has anyone tried this, or, does anyone have any input as to how this arrangement might sound?
If you use the Side outputs for heights and the Rear outputs for sides, then the sounds intended to come from your sides would instead come from above you and sounds intended to come from behind you would instead come from your sides.
 

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Quote:
Originally Posted by Gideon  /t/1462996/the-official-lexicon-processor-thread#post_23097637


Anyone knows when is the replacement for the MC 12 HD yet? Supposed to be last year but seem to be lost in transition.....
At CES last year (2012), Lexicon reps said that they had cancelled their MP-20 audio & video processor, mostly for problems that had to do with the latter (video processing). So it definitely wasn't supposed to released last year, considering the cancellation in January. At CES this year (2013), Lexicon's parent company Harman appeared to be concentrating on their biggest revenue streams, like car audio (75% of Harman's income) and custom-install products like JBL Synthesis systems. Not much talk about their consumer brands like Lexicon and Mark Levinson.


I buy surround processors for the surround processing, so I have been looking forward to the successor to Lexicon's Logic7 processing: QuantumLogic Surround. It wouldn't matter to me if the box it came in had a Levinson, Synthesis, Lexicon or even Harman/Kardon faceplate; I just want the processing technology. With that in mind, I asked when I would be able to buy a pre-pro with QLS. They said that a Lexicon branded pre-pro was likely a couple years out and that I would probably be able to get QLS in a Synthesis branded pre-pro sometime sooner. Aside from that, they had no other info or timeline.
 
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