WiiM Pro Preview

dssme · Aug 28, 2023

Achim1812 said:
May be a good starting point for digging deeper. Or losing ground

Is There Such a Thing as a 75 Ohm RCA Plug? -- Blue Jeans Cable

www.bluejeanscable.com

If I can disrupt this entrance to another rabbit hole, I can report a slight improvement when switching to an existing Allo digione on a Pi 3 B+ as compared to the Wiim, using the same wire and DAC

However, the Wiim is better suited for driving my older computer speakers as an outdoor work motivation streamer.. which allows them to coexist in my setup

Still, rabbit holes have been able to sidetrack this distraction, so carry on....

Guest1 · Aug 28, 2023

Quite sure not

Had this page bookmarked a while ago. It comes back in mind every time this theme appears. To avoid that for me I deleted it already from the bookmarks.

dssme · Aug 28, 2023

Achim1812 said:
Quite sure not
Had this page bookmarked a while ago. It comes back in mind every time this theme appears. To avoid that for me I deleted it already from the bookmarks.

What would an audio...hmm, or any, forum be like without a rabbit hole?

Guest1 · Aug 28, 2023

dssme said:
What would an audio...hmm, or any, forum be like without a rabbit hole?

Love the rabbit holes...but only mine

ruslan6060 · Aug 28, 2023

onlyoneme said:
I've made some rough tests with the Pro and different cables terminated at 50 or 75 ohms, and results varied. Signal level differences were obvious but it wasn't so obvious with the observed signal quality. I'm skeptical a bit about the declared impedances for RCA cables, but I have no equipment to verify it.

Cables are made to order in my city. The manufacturer asks Do you need 50 ohms or 75 ohms? It is necessary to connect the output of the Wiim pro and the input of the Topping dx3pro + DAC via coaxial. The optical output is busy with me. At 50 ohm, the cable is thin and flexible. At 75 ohms it's much thicker and stiffer. And the central vein itself is the same for both. Here I don't know. Which one to order?

onlyoneme · Aug 28, 2023

ruslan6060 said:
Cables are made to order in my city. The manufacturer asks Do you need 50 ohms or 75 ohms? It is necessary to connect the output of the Wiim pro and the input of the Topping dx3pro + DAC via coaxial. The optical output is busy with me. At 50 ohm, the cable is thin and flexible. At 75 ohms it's much thicker and stiffer. And the central vein itself is the same for both. Here I don't know. Which one to order?

All I can be sure here is that both kinds can be stiff or flexible. For example Mogami 2964 is 75 ohms and flexible.
As we do not have a clarity I'd suggest 75 ohms one.

ruslan6060 · Aug 28, 2023

onlyoneme said:
All I can be sure here is that both kinds can be stiff or flexible. For example Mogami 2964 is 75 ohms and flexible.
As we do not have a clarity I'd suggest 75 ohms one.

Thank you. For advice. I'm more interested in the quality of signal transmission. Rigidity is not that important. I'm also leaning towards 75 ohms. There is very little information on the forums specifically about using 50 ohms or 75 ohms. Maybe there is no difference in quality?

Mike in NY · Aug 28, 2023

ruslan6060 said:
Thank you. For advice. I'm more interested in the quality of signal transmission. Rigidity is not that important. I'm also leaning towards 75 ohms. There is very little information on the forums specifically about using 50 ohms or 75 ohms. Maybe there is no difference in quality?

The SPDIF specification for coax is 75 Ohms, there is no consideration there for quality. Both the sending and receiving device should adhere to 75 Ohms if they are following the SPDIF specification, and so too should the connecting cable.
A composite video cable should also be 75 Ohms, if you still have one laying around give it a go.

ruslan6060 · Aug 28, 2023

Mike in NY said:
The SPDIF specification for coax is 75 Ohms, there is no consideration there for quality. Both the sending and receiving device should adhere to 75 Ohms if they are following the SPDIF specification, and so too should the connecting cable.
A composite video cable should also be 75 Ohms, if you still have one laying around give it a go.

Thank you . everything became clear. I order a 75 ohm coax.

ruslan6060 · Aug 28, 2023

Mike in NY said:
The SPDIF specification for coax is 75 Ohms, there is no consideration there for quality. Both the sending and receiving device should adhere to 75 Ohms if they are following the SPDIF specification, and so too should the connecting cable.
A composite video cable should also be 75 Ohms, if you still have one laying around give it a go.

Follow up question. And theoretically, a 50 ohm cable will degrade the signal quality? Compared to 75 ohms? I can't check it myself yet. Since it is necessary to order the manufacture of cables.

Guest1 · Aug 28, 2023

Do not expect a clear advice here, nobody will take responsibility

They all can measure everything and nothing. The result will nearly each time be a clear and straight "it depends".
Do not expect an audible difference, this discussion is as old as hifi is. If you want to avoid an only theoretically possible decrease in sound quality go for the 75 Ohm. If not satisfied you can sue me at the SCOHF.

Guest1 · Aug 28, 2023

Want to add for all eventualities my words are valid for "normal" cable length, lets say up to three meters. If you want to use significantly longer RCAs there is a chance that is has an impact.

ruslan6060 · Aug 28, 2023

Achim1812 said:
Do not expect a clear advice here, nobody will take responsibility They all can measure everything and nothing. The result will nearly each time be a clear and straight "it depends".
Do not expect an audible difference, this discussion is as old as hifi is. If you want to avoid an only theoretically possible decrease in sound quality go for the 75 Ohm. If not satisfied you can sue me at the SCOHF.

Thank you . I ordered 75 ohms. I think my 63 year old ears are not very picky. I can't hear the difference. Cable length 1 meter.

Guest1 · Aug 28, 2023

My ears are even nearly 72 years old. But I could not hear a difference years ago. And my ears are and have always been among the best working parts of my body

ruslan6060 · Aug 28, 2023

Achim1812 said:
Моим ушам даже почти 72 года. Но много лет назад я не услышал разницы. А мои уши были и всегда были одной из лучших рабочих частей моего тела.

Да в молодости и уши и еще что-то работают...

Mike in NY · Aug 28, 2023

Achim1812 said:
The result will nearly each time be a clear and straight "it depends".

Exactly, it depends if each the sending and receiving devices both strictly adhere to the 75 Ohm specification (or not), and also the cable stock and connectors themselves. Invariably there will be some deviation from 75 Ohms unless using BNC instead of RCA, however that doesn't mean sound quality will be wrecked.
That said, there is no good reason to opt for a 50 Ohm cable when the specification calls for 75 Ohms.

Mike in NY · Aug 28, 2023

I await my new Wiim Pro Plus, at which point I can use my fancy schmancy 75 Ohm coax cable, currently this cable's Canare RCA connector barrel diameter is too large to fit the opening in the Pro's chassis.

Amazon.com

ratty · Aug 28, 2023

I chose QED Performance Digital based on the perfectly adequate tech specs and the fact that the connector would actually fit the Pro.

dssme · Aug 28, 2023

onlyoneme said:
All I can be sure here is that both kinds can be stiff or flexible. For example Mogami 2964 is 75 ohms and flexible.
As we do not have a clarity I'd suggest 75 ohms one.

Mike in NY said:
I await my new Wiim Pro Plus, at which point I can use my fancy schmancy 75 Ohm coax cable, currently this cable's Canare RCA connector barrel diameter is too large to fit the opening in the Pro's chassis.

View attachment 2300

Amazon.com

good point, any cable that can't fit inside the cutout is unusable

The pro plus is a bigger cutout (from photos) so could likely fit a larger connector

From this photo, I think this cable would fit the pro plus, but certainly I'm guessing

onlyoneme · Aug 28, 2023

No issue with such Canare plugs and the Pro Plus. It's hard to go in but it fits also my Pro.

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