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Ultimate Audio Playback / Orelino / Orelo MKII Loudspeakers / Re: In anticipation of my new Orelino speakers
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on: March 08, 2014, 09:11:46 am
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I recently discovered some cables with a capacitance as low as 47pF/m. The cables are hand made by order and this is what the technician who build them told me when I asked him about the capacitance of this cables (this is a translation, sorry if there is some technical fault): "The previous version had a Star Quad (4 twisted conductors) geometry with a common braided shield. The new one is a miniaturized version of the above: same metal, same insulation, same cotton filling, but being thinner I can use two separate conductors per channel, each with their own shield and each with positive and negative signal in braiding pair. By reducing the size I can use an additional wire for connecting the grounds, and thus the shielding of each tube is connected only at the end of the destination (male connector), and so the only effective capacitance is the one which occurs between the stranded conductors: 47pF/m, unlike the previous cable thatīs about 50pF/m between conductors and 100pF/m between conductors and shield." This cables are the most neutral and clean I ever had. I compared this cables with the AntiCables and found the AntiCables adding some kind of brilliance, same as Mani said. As a plus they are cheap. Now all my cables are made by this guy including the power cable for the NOS1 with an L shape connector which make it easier to route the interconnection cables without touching the power cord. If anyone is interested in this cables PM to juanpmar@gmail.com. Iīll be glad to help. Regards, Juan
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440
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Ultimate Audio Playback / Orelino / Orelo MKII Loudspeakers / Re: In anticipation of my new Orelino speakers
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on: February 11, 2014, 11:02:01 am
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Hi Mani, I think also that the best option is the 3 with the recommendations made by Peter. Then, once you have the Orelino, I would concentrate on the acoustics of the room so that the sound has adequate reflection and dispersion. Being a room specially prepared to work with sound sometimes the internal insulation of the room makes the reflection and dispersion of sound too lively or too deaf, however I understand that the isolation of this room (option 3) is done by creating a double chamber, so maybe the acoustics of your room is correct. Anyway, that's another issue to consider later. ...the best IC only (just find yourself the lowest capacitance numbers on earth and see whether your microphone IC is not twice that). Peter
Peter, what is a low capacitance value? My RCA cable has a capacitance value of 50 pF/m, is it a good value for a IC to be connected to the NOS1? Thanks, Juan
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443
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Ultimate Audio Playback / Playback Tweaks and Source related subjects / Re: USB to PC chassis ground ? (noise) - The biggest change ever !
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on: January 29, 2014, 01:43:09 pm
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No no, not bad in this case, but for SQ it may matter somewhat.
XLR is plus/minus and ground. When you use a converter cable from XLR to RCA that cable will connect plus to ground (or minus to ground - never mind). And the ones connected ("shortcutted") are exactly the ones used for measuring DC Offset, which is the other pair of the signal when RCA is used; that is why sound just works while offset reads 0.00.
I hope it it is clear and also that I assume that you indeed convert from XLR to RCA - which should be true ...
Peter
Thanks Peter, now I understand it. I convert XLR to RCA in the amplifier input with an adapter Juan
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444
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Ultimate Audio Playback / Playback Tweaks and Source related subjects / Re: USB to PC chassis ground ? (noise) - The biggest change ever !
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on: January 29, 2014, 12:25:53 pm
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Juan,
You are just shortcutting the sense pins with your XLR->RCA cable (bet ? haha).
What I'm not sure about is whether Alain now also suddenly has 0.00 values. If *that* is so, something else is going on. My values are not 0.00 anyway, but I use RCA ...
Still, at reading through the last posts I now start to wonder whether what we hear (I not) (shifting to the left or right) comes from minuscule DC offset ...
Peter
Shorcutting? that sounds bad, do you mean that something is broken? In such a case what should I do? As far as I know Alain only commented about my 0.00 values not about his own. The shifting to the left, in my case, was before I got the 0.00 values. It happened with my usual -8.50mv and -10.50mv Best regards, Juan
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445
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Ultimate Audio Playback / Playback Tweaks and Source related subjects / Re: USB to PC chassis ground ? (noise) - The biggest change ever !
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on: January 29, 2014, 09:49:01 am
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Peter, yesterday I changed the interconnection cables from RCA to XLR and while with the RCA the DC offset was -8.50mv and -10.50mv when I changed the cables (with the NOS1 On) the meters suddenly went to -0.00mv and -0.01. I tried it some times more from the NOS1 Off with all the cables disconnected until I got the usual -8.50mv and -10.50mv but any time when I connected the XLR cables the metters went to those 0.00mv. The sound was great but as that change in the DC offset values never happened before and as the meters were absolutely firm with not fluctuations at all I thought that something was wrong and after a while I turned Off the NOS1 just in case. I donīt know if it could have something to do with the USB isolation in any or both sides. Before returning to the situation prior to the isolation I would like to know your opinion.
Best regards, Juan
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447
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Ultimate Audio Playback / Playback Tweaks and Source related subjects / Re: USB to PC chassis ground ? (noise) - The biggest change ever !
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on: January 29, 2014, 01:16:45 am
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Hi Juan, There is almost no DC offset at all and this surprises me (in a good sense) By the way, do you hear the sound a little tilted to the right ? Well maybe not all of the songs, but as a general tendency ? Alain Hi Alain, The values are totally firm in -0.00 and -0.01 and that seems strange to me because usually the values have some small fluctuations. Letīs see what Peter says. So far I donīt hear the sound tilted to one side or the other, before, with the card isolated, I had the voices tilted toward the left side. I subscribe totally the last post from Stanley as I also use W8 and havenīt tested W7 since we started with W8. Very good SQ with the the sound image correctly placed. Some hum though (Peter asked about it) perceived only when I touch with my ear the front of the speaker but nothing annoying and totally imperceptible from a couple of feet away and of course when listening music. The speakers Iīm using now, Rogers ls3/5a, are not very sensitive anyway (Sensitivity: 82dB/W/m. Nominal impedance: 15 ohms). Juan
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Ultimate Audio Playback / Playback Tweaks and Source related subjects / Re: USB to PC chassis ground ? (noise) - The biggest change ever !
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on: January 28, 2014, 11:11:32 pm
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Peter, Iīd say that with both sides isolated there is a similar hum as when both sides are non isolated. So, more hum than when only the card is isolated.
Now I have a different problem, lately Iīve been using the NOS1 RCA outputs but today I wanted to test some XLR cables and when I plugged the cables in the XLR NOS1 inputs the meters were reading 0.00mv. This happens with both sides isolated and it was nīt happening in the other cases, with only the card isolated or with none of them isolated.
Regards, Juan
Hi Juan, 0.00mv ? Isn't that the Nirvana that we are all looking for ? Alain What a fool I am!, seeing 0.00mv I donīt tried it. It works perfectly, the measures really are 0.00mv and 0.01mv, very well matched indeed. Before I always had -8.5mv and -10.5mv. Thanks Alain! Juan
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449
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Ultimate Audio Playback / Playback Tweaks and Source related subjects / Re: USB to PC chassis ground ? (noise) - The biggest change ever !
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on: January 28, 2014, 10:25:53 pm
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Thanks Alain, Peter, Iīd say that with both sides isolated there is a similar hum as when both sides are non isolated. So, more hum than when only the card is isolated. Now I have a different problem, lately Iīve been using the NOS1 RCA outputs but today I wanted to test some XLR cables and when I plugged the cables in the XLR NOS1 inputs the meters were reading 0.00mv. This happens with both sides isolated and it was nīt happening in the other cases, with only the card isolated or with none of them isolated. Regards, Juan
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