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  #1  
Old 12-02-2014, 10:32 PM
maxdog maxdog is offline
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Default Balance issue

I'm not sure this is the proper forum for this, but since one of my components is a Modwright Oppo-105, I'll start here.
I am experiencing a balance issue in my system when I switch from balanced to SE with my preamp, and I'm baffled as to what is going on.
I have the Oppo driving a Ref 3, Magtech amp, and Magnepan 3.7's.
When I set the preamp in balanced mode, the balance shifts in favour of one speaker. It is obviously louder. In SE mode, it's equal.
This happens whether I use all SE cables, all balanced or a mix.
I returned the player to Dan several months ago, and he looked at it. Concluded all was good, and therefore I started to look at different components.
Put another amp in the system, problem still there.
Put my old GNS Resolution audio in, still there.
Swapped cables, no change.
This occurred with my previous preamp, and ARC LS15, so think I can rule out that component.

What I would like to know is "Is it possible for a CD player, etc, to output different levels through the SE outputs Vs the Balanced ones". In other words, is it possible that the signal is equal in the SE mode but not in the Balanced mode.

It's what it sounds like to me , but I'm not an electronics guy, so mu knowledge is limited.
Hopefully, I'll get some feedback here that will help me solve this dilemma.
When I swap cables at the output of the player, the issue changes channels.which has led me to suspect the player, but Dan didn't find any problems.
All advice appreciated, and thanks in advance.

BTW...Swapped the tubes as well, and no change.

Last edited by maxdog; 12-02-2014 at 10:39 PM.
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  #2  
Old 12-02-2014, 10:45 PM
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djwhog djwhog is offline
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Sure sounds like the 105, if you have more resistance in the Chanel then yep it is low. How about for kicks a basic audio red book cd with hdmI, what are the levels then? It it was the laser pickup or a dac on one side then all outputs would be unbalanced right. But if diff outputs result in miss matched levels it seems to me to be in that output stage.

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Dave's Cave main Basement system
C500C C500T preamp and a MX150 control center, (3)McIntosh 601 mono block amps, (1)7270 McIntosh amp driving rears in 7.1 (1)Halo A23 amp for side surround, & (1)452 McIntosh amp for main towers part of a bi-amp setup with 601's, Esoteric K-03 JL F212 sub all glued together with mostly all WireWorld & Moon Audio Black Dragon cables.

Headphone Rig
Audeze LCD-X Sennheiser hd 800 & Sennheiser hd 700 cans, Woo Audio WA-6SE with Sophia Princess & matched pair of 6GL7/6EM tubes Black Dragon Cable upgrades on the HD700s!

Streaming Dac Gear
includes K03, high-end custom built Toshiba core i7 16 gigs Wireworld Platinum USB cable, Ipad mini & Itouch driving media center 20 for full remote control anywhere on property and even via web to have music on when I get home Also can remote control MX150 via web too.

Analog Rig
VPI Classic II running with a Dynavector 20X2-H MC Phono Cartridge

Also
For living room and outside rear deck is connected to MX150 with (1)Parasound 5250 amp. Oppo 205 , Sony ES777, (1)PPP, and a DirectStream P15 Power Plant

Speaker system
Builder of custom very high end Dynaudio's 2 Main towers, 1 super tweeter Dynaudio built system above each tower, 4 surrounds all Dynaudio Esoteric drivers 6.5 mids, esoteric dome tweeters, 2 rear surrounds, and a custom 5 speaker 2 7" drivers, 2 3" domes, and a d21 tweeter in the center channel to compliment my 2 300lb custom subs and a JL F212

Misc Build Features
AC Power Electrical overview is 4 20 amp 120 circuits all 10-3 wiring extra shielding with walls custom modded with cross bracing 2x6s over a 14" thick concrete with R19 and weather barrier
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  #3  
Old 12-02-2014, 10:50 PM
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crwilli crwilli is offline
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Do you have tubes in the output stage? Bad tube?
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Main room - Sonus Faber Stradivari, JL Audio F113v2 & CR-1 Crossover, McIntosh MC2301 Amplifiers with Stillpoint Ultra SS feet, McIntosh C1100 on Stillpoint Minis, Esoteric K-03X on Stillpoint Minis, Cybershaft Ultimate 2 OP17 on Stillpoint Minis, SilenZio v.2 Audio by -E- Media Server (running ROON), GigaFoil v4, Keces P3 with Ghent PC, 9 M Supra Cat 8+ and 0.65 M Revelation audio ethernet cables.

Other - 5 Stillpoint Apertures, GIK Bass Traps, Vicoustics Waveguide panels, Shunyata Alpha Clock 75 1.5 meter BNC, Shunyata Alpha 1.5 meter USB, WW Gold Eclipse 7 SCs, WW Silver Electra 7 PCs, WW Silver Eclipse ICs; 3 X 20 Amp Power lines, PS Audio P10 & Dectet, 3 Sound Anchor stands, Powerports and numerous Noise Harvesters. Furutech Flex 50, Cable risers, HRS dampeners

TV Room Audio - Panasonic TC-P60GT50, McIntosh MX-121, MC7106, Revel F52 & C32, B&W LM1, Sonos Connect\W4S Remedy\iFI 9V Power, WW & Kimber cables, PS Audio Dectet
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  #4  
Old 12-02-2014, 10:58 PM
maxdog maxdog is offline
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tubes in the output..yes . But swapping channels with them does nothing.Still balance issue in the same channel.
As well, have the tubes that came with the player and installing them makes no differenceIt really seems like an output imbalance on the Balanced circuits, but Dan checked this out when I returned it , and found it ok.

Are the output stages the same circuitry for bot the balanced and SE outputs, or are they different? If different , then that might be the issue...

BTW..the damned thing sounds great..just would like to have the outputs equal, should I ever decide to sell it or use a fully balanced setup...

Last edited by maxdog; 12-02-2014 at 11:02 PM.
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  #5  
Old 12-02-2014, 11:00 PM
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djwhog djwhog is offline
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Yes a weak tube would for sure since that is a function, you have amplification tubes and a power tube in that rig correct?

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__________________
Dave's Cave main Basement system
C500C C500T preamp and a MX150 control center, (3)McIntosh 601 mono block amps, (1)7270 McIntosh amp driving rears in 7.1 (1)Halo A23 amp for side surround, & (1)452 McIntosh amp for main towers part of a bi-amp setup with 601's, Esoteric K-03 JL F212 sub all glued together with mostly all WireWorld & Moon Audio Black Dragon cables.

Headphone Rig
Audeze LCD-X Sennheiser hd 800 & Sennheiser hd 700 cans, Woo Audio WA-6SE with Sophia Princess & matched pair of 6GL7/6EM tubes Black Dragon Cable upgrades on the HD700s!

Streaming Dac Gear
includes K03, high-end custom built Toshiba core i7 16 gigs Wireworld Platinum USB cable, Ipad mini & Itouch driving media center 20 for full remote control anywhere on property and even via web to have music on when I get home Also can remote control MX150 via web too.

Analog Rig
VPI Classic II running with a Dynavector 20X2-H MC Phono Cartridge

Also
For living room and outside rear deck is connected to MX150 with (1)Parasound 5250 amp. Oppo 205 , Sony ES777, (1)PPP, and a DirectStream P15 Power Plant

Speaker system
Builder of custom very high end Dynaudio's 2 Main towers, 1 super tweeter Dynaudio built system above each tower, 4 surrounds all Dynaudio Esoteric drivers 6.5 mids, esoteric dome tweeters, 2 rear surrounds, and a custom 5 speaker 2 7" drivers, 2 3" domes, and a d21 tweeter in the center channel to compliment my 2 300lb custom subs and a JL F212

Misc Build Features
AC Power Electrical overview is 4 20 amp 120 circuits all 10-3 wiring extra shielding with walls custom modded with cross bracing 2x6s over a 14" thick concrete with R19 and weather barrier
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  #6  
Old 12-02-2014, 11:27 PM
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crwilli crwilli is offline
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Location: Bluffton SC
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At my limit of ideas. Have you contacted the modwright folks? Cables? Switch L and R? Basically have you eliminated the obvious?
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Main room - Sonus Faber Stradivari, JL Audio F113v2 & CR-1 Crossover, McIntosh MC2301 Amplifiers with Stillpoint Ultra SS feet, McIntosh C1100 on Stillpoint Minis, Esoteric K-03X on Stillpoint Minis, Cybershaft Ultimate 2 OP17 on Stillpoint Minis, SilenZio v.2 Audio by -E- Media Server (running ROON), GigaFoil v4, Keces P3 with Ghent PC, 9 M Supra Cat 8+ and 0.65 M Revelation audio ethernet cables.

Other - 5 Stillpoint Apertures, GIK Bass Traps, Vicoustics Waveguide panels, Shunyata Alpha Clock 75 1.5 meter BNC, Shunyata Alpha 1.5 meter USB, WW Gold Eclipse 7 SCs, WW Silver Electra 7 PCs, WW Silver Eclipse ICs; 3 X 20 Amp Power lines, PS Audio P10 & Dectet, 3 Sound Anchor stands, Powerports and numerous Noise Harvesters. Furutech Flex 50, Cable risers, HRS dampeners

TV Room Audio - Panasonic TC-P60GT50, McIntosh MX-121, MC7106, Revel F52 & C32, B&W LM1, Sonos Connect\W4S Remedy\iFI 9V Power, WW & Kimber cables, PS Audio Dectet
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  #7  
Old 12-02-2014, 11:36 PM
maxdog maxdog is offline
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Yes..it's been back for a once over...and cables swapped...tubes swapped...I'm just baffled and aside from a defect in the output stages I don't know where to look.
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  #8  
Old 12-03-2014, 12:21 AM
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JJinID JJinID is offline
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Another thought would be to run your MW Oppo directly to your amp to test things out that way. Just make sure when you switch over to variable output that you lower the volume on the Oppo down to at least 50% so you don't blow out your speakers (or your ears)!
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McIntosh MC501s, XRT29s, XR27, WS350s
ModWright LS 300 Preamplifier
Denon AVR-A100 HT Receiver
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Schiit Audio Yggdrasil DAC
Sonore Ultrarendu with Uptone Audio LPS-1.2
Oppo UDP-205 with ModWright Signature Truth Tube Modifications
Clearaudio Performance SE TT with Hana ML MC cartridge
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  #9  
Old 12-03-2014, 12:25 AM
maxdog maxdog is offline
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Good idea...I'll try that tonight..Thanks
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  #10  
Old 12-03-2014, 01:08 AM
maxdog maxdog is offline
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Plugged the CD/DVD player direct to the amp...in balanced mode, still a channel imbalance. Looking more like the player is at fault.
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