RCA to XLR Cable ("pseudo-balanced") to buy ?

[Sokel]

Also note that in the schematic at the end of the above paper Putzeys is making use of the full XLR connector,ie apart from the usual -+G also connects ground with the XLR's case (through the 4th pin on top usually) on both input and output connectors.

(TRS usually does that naturally,by it's design alone if it's case is metallic)

 

[Sokel]

I use cordial cables only - high quality, low price. e.g.: https://www.thomann.de/de/cordial_cfu_3_mc.htm

I wouldn't use Cordial without thorough inspection first:



The above splits shield in two to connect - and G and uses the rest two cables to connect + .

 

[Paffi]

I wouldn't use Cordial without thorough inspection first:

View attachment 384224

The above splits shield in two to connect - and G and uses the rest two cables to connect + .

I use Cordial for every connection, I never had any issues, so no matter for further research for me

 

[TurtlePaul]

I love that I was able to necro this old thread.

Yeah probably…
You could just get the Neutrik or Amphenol connectors and some Mogami cable if you are starting from scratch

I could start with connectors, however my used $1000 pair of 8030C arrived in the mail yesterday after only one day despite getting standard shipping. I want usable cables ASAP so I can test the speakers and know if they need to go back. I won’t be able to get around to soldering this weekend or next week (can’t do it when my kids are home).

I understand the purpose of the ground lift with the resistor, but maybe somebody who understands the circuit better than I can explain why the cap is useful/needed to lower the impedance above the audio range.

 

[antcollinet]

I love that I was able to necro this old thread.

Bollox - I've just realised I've replied to 2 1.5year old posts.

So thanks for that. Theres a reason necromancy is a crime.

 

[Holmz]

I love that I was able to necro this old thread.

I could start with connectors, however my used $1000 pair of 8030C arrived in the mail yesterday after only one day despite getting standard shipping. I want usable cables ASAP so I can test the speakers and know if they need to go back. I won’t be able to get around to soldering this weekend or next week (can’t do it when my kids are home).

For a minute I thought an 8030 was a $1k cable

I understand the purpose of the ground lift with the resistor, but maybe somebody who understands the circuit better than I can explain why the cap is useful/needed to lower the impedance above the audio range.

I’ll take a crack…
For instance with a phono/TT one can get RF oscillations happening. Some say that pops-n-clicks can be the phono stage getting overloaded from the RF.
Something about an inductor in parallel with a capacitor.

And low pass filter is probably not a bad thing, if we assume that one cannot hear a lot sound above 100 kHz.
Clearly on the speaker cable side some way to quell RF from a class is could be handy, but most class-D amps shoudl be fingering out their RF.
However “analogue” Class AB can also generate RF frequencies under certain condition..

 

[jiggad369]

Is the Cap/Resistor on pin 1 still the recommended method?

 

[AnalogSteph]

Is the Cap/Resistor on pin 1 still the recommended method?

Which exact scenario are you referring to? Pst#41? The internal 100R||100n as suggested in the NC400 datasheet?

 

[jiggad369]

Which exact scenario are you referring to? Pst#41? The internal 100R||100n as suggested in the NC400 datasheet?

Was the 100R||100n method only for NC400 based amps? Or newer NCX/Purifi based amps also?

 

[Speedskater]

While a hybrid XLR to XLR interconnect will use a capacitor on pin 1 of the receive end cable XLR connector.
What does that have to do with a RCA to XLR adapter interconnect cable?

 

[jiggad369]

If the source is an AVR with unbalanced outputs (Denon AVR), which cable method is correct? OP or the one below?

 

[Speedskater]

I would go with the drawing in post #1.
But not attach the cable shield to the RCA connector.
(after all we know that the XLR pin 1[shield] is attached to the metal chassis [also shield])
RCA connector are not always at chassis potential (lots have plastic insulator rings)

 

[AnalogSteph]

If the source is an AVR with unbalanced outputs (Denon AVR), which cable method is correct? OP or the one below?

With the R||C, you have the advantage of the cable working regardless of whether the source or the amplifier is floating. Basically, it provides a low enough impedance to tie both ground potentials together if need be but at the same time still is high enough to not cause major ground loop currents to be circulating through the AVR if both devices are earthed somewhere (usually with much lower impedance of ~1 ohm). Note that R+C values are ballpark figures and may be varied if need be (100R-1k and 10-100n, respectively).