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#1
02-26-2013, 11:55 PM
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Ref40 input confusion
My ref40 has about 3000hrs on it. Just noticed that although I am using XLR as input source, when I switch to Single Ended input (SE) mode, I still get music. Is this normal ? So far I have noticed this for 2 of the inputs. One of the inputs has lower volume in SE while input was actually XLR.
Regards, Joe Ling
__________________
Source 1 - Bergmann Sleipner + Benz Micro LP-S + ARC ref phono 10 (should have done this ages ago) Source 2 - Avid Acutus SP reference + Thales Reference tone arm + Benz Micro LPS (DS Audio Master 1 broken tip repaired but cost me USD2k. Still having issues - channel imbalance - back to dealer. However, channel issues not withstanding, sounded very very nice. Need to get it back soonest) Source 3 - DCS Vivaldi + Antelope reference clock or Cybershaft Op18 (not floating my boat so far) Source 5 - ROON ROCK with Aurender W20 as NAS & 2 units of SOTM switch with 10M input (the new frontier but still cannot beat CD for now) - ROON endpoint - Vivaldi upsampler Amplification - Naim Statement Speakers - ProAc Carbon 8 + JL FM113 x2 (replacement purchased - Stella Utopia EVO but due to lockdown, could be a year's wait) Purepower 2000 x 2 (&$@#% but sounds nice) Shunyata Denali X 2 
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#3
02-27-2013, 12:03 AM
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Hi Lunchy,
Thanks for the lightning fast reply. So I guess it is normal then. Well, one less excuse to switch to the ref10 then  Regards, Joe Ling
__________________
Source 1 - Bergmann Sleipner + Benz Micro LP-S + ARC ref phono 10 (should have done this ages ago) Source 2 - Avid Acutus SP reference + Thales Reference tone arm + Benz Micro LPS (DS Audio Master 1 broken tip repaired but cost me USD2k. Still having issues - channel imbalance - back to dealer. However, channel issues not withstanding, sounded very very nice. Need to get it back soonest) Source 3 - DCS Vivaldi + Antelope reference clock or Cybershaft Op18 (not floating my boat so far) Source 5 - ROON ROCK with Aurender W20 as NAS & 2 units of SOTM switch with 10M input (the new frontier but still cannot beat CD for now) - ROON endpoint - Vivaldi upsampler Amplification - Naim Statement Speakers - ProAc Carbon 8 + JL FM113 x2 (replacement purchased - Stella Utopia EVO but due to lockdown, could be a year's wait) Purepower 2000 x 2 (&$@#% but sounds nice) Shunyata Denali X 2
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#4
02-27-2013, 12:06 AM
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My Ref 5 and Ref 40 did the same. Normal for ARC line stage. Guess the reason can be answered by ARC or a few guys here who own authorized ARC repair facilities.
__________________
Wilson Alexia V, ARC Ref 160M MkII,Ref 40,Ref Phono2SE, Shunyata Triton3, Typhon, Sigma PCs, ICs & SCs, Spectral SDR4000SV (w MIT IC), Belcanto PL1, Oppo 205, Marantz 2270 (tuner only):AudioDesk and VPI record cleaners, Furutech Demag & Destat; Stillpoint Apertures, TechDas AF 3S Premium with SAT CF9 and Kuzma 4pt 9" arms, Lyra Atlas Lambda SL, Dynavector XV1-t stereo and XV1-s mono carts, Miyajima mono, Shure V15VxMR,
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#5
02-27-2013, 12:06 AM
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Both the XLR and SE inputs are wired to the same "input" on the preamp board. They aren't 2 separate inputs. The SE/Balanced switch merely changes the way the grounding is done for the XLR vs the SE incoming signal.
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#6
02-27-2013, 12:30 AM
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When SE is selected the negative input pin 3 of the XLR is shorted to ground to reduce noise. The gain will also drop by 3 dB since the negative input is shorted.
If you use RCA INPUT and don't select SE, you may hear some hum/hiss. Rich
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#7
02-27-2013, 09:02 AM
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