SMR Forums
Active Topics
Active Topics
Display List of Forum Members
Member List
Search The Forum
Search
Help
Help
 SMR Forums Home

Lexicon Analog Bypass Upgrade
Switch-box.com Discussion and Support
Lexicon Analog Bypass Upgrade
Topic:
Lexicon DC1, 2CH analog bypass?
 
Sponsored Links


 
Links from Google


 
Your Permissions

You cannot post new topics.
You cannot post replies.
You cannot delete posts.
You cannot edit your posts.
You cannot create polls.
You cannot vote in polls.

 
Topic Options

Printable versionPrintable version


 
Author Message
MikeMc
Cloth Ears
Cloth Ears


Joined: 09 Feb 2010
United States
Offline
Posts: 3
Quote MikeMc ReplyDirect Link Topic: Lexicon DC1, 2CH analog bypass?
    Posted: 09 Feb 2010 at 6:17pm
I have discovered amazing 2CH stereo from my Oppo 83 SE plugged into my DC 1 with the 8 CH analog bypass by Shawn Fogg. Big improvement from the 5.1 MCH mode, I guess due to the different DAC's used for dedicated stereo in the Oppo, but I have to manually unplug from the Oppo LF and RF, into its dedicated stereo 2 CH output which is cumbersome with my installation 
 
Is there anyway to switch to unprocessed, unconverted 2CH stereo with the push of a button? I assume that plugging in the Oppo stereo out to an unused analog in of the Lex results in processing, even in 2 Channel effect? and in 2 channel effect with "effect bypass" selected?
 
Thanks for the inputs.
IP IP Logged
Shawn Fogg
Golden Ears
Golden Ears


Joined: 11 Jul 2006
Offline
Posts: 648
Quote Shawn Fogg ReplyDirect Link Posted: 09 Feb 2010 at 8:48pm
Hi Mike,

About the only way of doing this with just a push of a button would be to change the way the L/R analog bypass input to my board is connected inside your DC-1. If onlythe L/R channels was moved from being directly connected to the input and put behind the DC-1s analog input switching (right ahead of the ADC) you can get both the multi-channel analog input as well as the ability to have a 2 channel analog bypass on any remaining analog inputs.

HOWEVER, in doing so the L/R channel ends up being roughly 10dB lower then all the other channels when in analog bypass mode. If the player offers enough level control over its analog outputs you can adjust for this. BTW... in the Oppo *never* turn up the speaker outputs above 0dB, only turn them down.

You are correct that even in 2 channel effect and effect bypass still results in the main L/R output having gone through a A/D and D/A stage in the Lexicon. The Zone 2 output is a true analog bypass and of course so is my modification.

Thanks,

Shawn
IP IP Logged
MikeMc
Cloth Ears
Cloth Ears


Joined: 09 Feb 2010
United States
Offline
Posts: 3
Quote MikeMc ReplyDirect Link Posted: 10 Feb 2010 at 12:01am
Thanks, Shawn.
 
I assume that mod would affect all the L R analog inputs, right? So if  I had the Oppo stereo connected to say the aux and my tuner connected to the tape input via analog, it would drop 10 db too? And I couldn't use the Lex processing at all on any analog inputs?
 
Since I'm running 5.1, or 6 channels and not using the side inputs (vdisc), is there not a way to hard wire that input to the L R, in addition to the VCR1 inputs which also go to the L R?
 
Otherwise:  I noticed a large bump in output depending on which effect I assigned to the 8 channel by pass. I now use Logic 7 with dialogue enhance at 0 (+3 up's the output by about 6 dB), Surround at +0, effect at +2, and SW at -1 which yields about the same balanced speaker out put as the digital input using Party effect. (Without any modification in the Oppo)As I recall the 2 CH Oppo connected to the Bypass L R is quite a bit louder. Do you think I could fiddle with the assigned affect and find an acceptable difference between the output of the 2 CH L R and the other inputs if modified as you mentioned?
 
Or is there a switch that could be used to toggle between the Oppo 2 ch and Oppo MCH L R into the Lexicon bypass?
 
I'd think when others listen to the Oppo 83 SE dedicated 2 channel  they'll be as stunned as I was, and prefer it to MCH for music. (I actually like the Lexicon processed sound over MCH, also.)
IP IP Logged
Shawn Fogg
Golden Ears
Golden Ears


Joined: 11 Jul 2006
Offline
Posts: 648
Quote Shawn Fogg ReplyDirect Link Posted: 11 Feb 2010 at 4:25pm
"I assume that mod would affect all the L R analog inputs, right?"

You could use any of the analog inputs for 2 channel analog bypass if needed.

"So if  I had the Oppo stereo connected to say the aux and my tuner connected to the tape input via analog, it would drop 10 db too?"

All your regular analog inputs are already doing this. You just don't see it happen. It is only an issue when you use the multi-channel analog bypass as the L/Rs get dropped 10 dB and nothing else does.

"And I couldn't use the Lex processing at all on any analog inputs? "

Sure you can. Just don't setup the input to be an analog bypass and the analog inputs work they way they always have.

"is there not a way to hard wire that input to the L R, in addition to the VCR1 inputs which also go to the L R? "

No, there isn't.

" I noticed a large bump in output depending on which effect I assigned to the 8 channel by pass. "

Yes, the Lexicon plays around with levels in the analog domain depending upon what mode it is running. Pick a mode to use the bypass and stick with it so you can balance your speaker levels properly in the analog bypass mode. If you change mode your speaker balance is thrown off.

"Do you think I could fiddle with the assigned affect and find an acceptable difference between the output of the 2 CH L R and the other inputs if modified as you mentioned?"

Drop all speaker levels other then the L/R in the Oppo by 10dB and you would be balanced.

"Or is there a switch that could be used to toggle between the Oppo 2 ch and Oppo MCH L R into the Lexicon bypass? "

Sure, any 2 channel analog switch would do this. But you would have to switch this manually. Radio Shack sells (or at least sold) them.

Shawn
IP IP Logged
MikeMc
Cloth Ears
Cloth Ears


Joined: 09 Feb 2010
United States
Offline
Posts: 3
Quote MikeMc ReplyDirect Link Posted: 25 Mar 2010 at 12:38am
Shawn, Would you let me know about cost and turn around time on the "2 CH" analog by pass on my Lexicon DC1?
 
I've investigated a switch like a Zektor to go from MCH to 2CH but have limited space for all that extra cabling, so maybe the 10db drop of your solution is a better way to go. 
 
Thanks,
 
Mike McCarver
IP IP Logged
Forum Jump   Post Reply Post New Topic
Quick Login - Name:   Password: