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News: Dec. 31, 2012 : XXHighEnd + Phasure NOS1 DAC receive 6moons Blue Moon Award !
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 71 
 on: November 19, 2014, 04:47:34 pm 
Started by christoffe - Last post by Stanray
Hi Stanley,

Are you sure that there's an *extra* network involved when using RCA ? I mean, usually itis the other way around.

or

Or you have a fully differential amplifier and internally RCA turns into balanced again and then you are correct (extra network for RCA).

In the latter case it is hard to predict but that network is then for the good cause because it will sustain your amp's internal differential working; always better than shut off half (which I think won't even be possible).
Although this is a bit unrelated to the work out of BNC vs XLR, BNC will be the better one because of other properties. Only cancellation of (picked up) noise will not be there (but I don't have that either).
One thing, the opamp most probably involved indeed won't be for the better. No idea whether you will notice against the new cable.

When it is the other way around - and your (real) balanced input turns into Single Ended internal operation, then BNC will be for the better because of the further (better) properties. For RCA probably not (but this is a moot thing). So here it now will only be about the cancellation of (picked up) noise.
So this part is the same for both situations.

I must agree - not easy to determine in advance when your idea about this network is correct. Sorry ...

Peter


Thanks Peter,

As far as I can see (understand) my amps are fully differential.

Please see this (Italian) article: http://www.audiocostruzioni.com/r_s/ampli/amplificatori/audioanalogue-maestro-200-monoblock/audio-analogue-maestro-200-monoblock.htm.

On the 5th and 6th photo you can see the structure of the monoblocks and on the 4th photo you can see the input terminals. On the right hand side to the XLR input are 2 RCA's. The rightmost RCA is the "positive IN" and the left RCA is the "negative IN".

The manual adds: "The connection may be either balanced or unbalanced. If you choose an unbalanced connection, the connector of the other phase may be left open or connected to a 600 ohm impedance termination". Using balanced connection results into a better noise/sound ratio.

I guess it will be a matter of trying out. The worst thing that can happen is that I will have to change back the BNC's for the XLR's on the NOS1a.

Stanley

 72 
 on: November 19, 2014, 04:20:39 pm 
Started by christoffe - Last post by juanpmar
Thanks again Peter, those are great news!

Juan

 73 
 on: November 19, 2014, 04:17:45 pm 
Started by vrao - Last post by christoffe
Hi Peter,

I'm using the YFS Reference USB cable, and so we are comparing apples with oranges. I can't compare with the other "testers".

Joachim

EDIT: May I have a photo of your by-pack USB cable that I can dig it out. Thanx

 74 
 on: November 19, 2014, 04:16:45 pm 
Started by christoffe - Last post by PeterSt
Yes Juan. As far as I can see you will only lose that noise rejection, if important at all.
But find that electronics shop for your NOS1a of course.

Regards,
Peter

 75 
 on: November 19, 2014, 04:11:49 pm 
Started by christoffe - Last post by juanpmar
Thank you!! Peter. Does it mean that I can use the 75B upgrade with all the benefits the same way as others with RCA amps?

Regards,
Juan

 76 
 on: November 19, 2014, 04:02:42 pm 
Started by christoffe - Last post by PeterSt
Juan, no problem at all. Just connect the wires which are currently soldered to those pin 1 and pin 3 together on the inside. What's now connected to pin 2 is the "hot" wire and that goes to the middle of the new BNC connector. The other two (remember, you just soldered them together) go to the "ground lip" of the connector (sticks out to the side).

Just save this text for when you are up to it ... Happy
Peter

 77 
 on: November 19, 2014, 03:46:02 pm 
Started by christoffe - Last post by juanpmar
Hi, I need some help, could someone tell me seeing my speaker data sheet if I can modify the input xlr to use the NOS1a 75B with Blaxius cables?

Please see also de Operating Manual (2. Installation and Figure.3) where there is information about changing the XLR to RCA

Thanks,
Juan

 78 
 on: November 19, 2014, 03:12:12 pm 
Started by vrao - Last post by vrao
Hi,
I've compared 2 YFS cables, one Cu with Ag coating (V4, the model that you have), and the other pure Cu(custom). this is in comparison to the Phasure cable. Bass is excellent. I've listened to a 3m drum, which sounds like a 3m drum (sound pressurizing the room is disorienting). F4 takeoff, sound pretty authentic (hold on to your pants .. etc). Subharmonics go well below 30 Hz. There is slightly better bass resolution with the YFS cable (actually overall resolution, and better SNR). There is a slight noise with the Phasure cable, one will notice better after hearing the data only cable. The edginess with the V4 is "reduced" with custom cable. Laser sharp imaging is seen with both.  There there are a few differences b/w the 2 models I tried, with sound staging and spectral balance when compared to Phasure cable.

Coen, I would play it for a few hours/overnight to maybe burn them in again. Maybe that might help.


**edit** The tour cable is Ref Data cable

 79 
 on: November 19, 2014, 02:56:50 pm 
Started by vrao - Last post by christoffe
Quote
a „normal“ cable

Which is not the one we provided with your NOS1 ?
Can you still find that ?

Regards,
Peter

Hi,

no, I can't remember. 
The beginning of listening with the NOS1 USB version was with a normal USB cable, then came a cable from Entreq which created a better SQ and then the YFS.

The YFS **Reference** has an extra/additional shielding and this influences the SQ. (keyword: every cable is an antenna)

Joachim


 80 
 on: November 19, 2014, 02:38:54 pm 
Started by vrao - Last post by PeterSt
Quote
a „normal“ cable

Which is not the one we provided with your NOS1 ?
Can you still find that ?

Regards,
Peter

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