I've sat on the toilet and done some thinking lately. Contemplating life and somewhere in that, HDMI cables came into the picture.
dot dot dot. Awhile back when I had my Holo Audio Spring
(now owned by my neighbor), I used a WireWorld Starlight 5.2 & 7 in 0.3M and 0.5M length. To me there was less bending with the 0.5M which was a plus, and when comparing to the shorter 0.3M, I could not tell any audible differences.
Later down the road I picked up a super short 0.5FT cable from Sewell called the "
Silverback S6". Due to the shorter length, I had to positioned my Singxer SU-1 right above the Holo Audio Spring next to it's HDMI port otherwise the cable didn't reach. As you may know, I
2S is not made for long runs so the theory was that the shorter cable would be better.
0.5FT
> 0.3M
> 0.5M
After over 6 hours of A/B test with my favorite benchmark songs, that theory
(for me), was true, HOWEVER, only when comparing to other cables that were 1 meter or longer. The build quality of the Sewell may not be as great as the WireWorld, but it's shorter distance saved it from jitter. The WireWorld may not be as short the Sewell, but it's improved materials
(wire, shielding ,connectors, and design) and build quality saved it from jitter. At the longer length of 1 meter however, nothing can save it. The losses can only be reduced. This was evident when I compared the same cable, a
[COLOR=FF0000]WireWorld Starlight 7[/COLOR] but in two different lengths, 1 meter and 0.3 meter. The longer cable had more of a metallic sound to it, the digital edges were sharper and had more glare to it. This was easily noticeable on a R2R Ladder + NOS setup.
After my experimentation, I kept the super short Sewell cable, but still also kept the
[COLOR=FF0000]WireWorld Starlight 7[/COLOR] (only 0.3M) as I liked the aluminum connector... I sold the 0.5M one to my neighbor...dot dot dot. Fast forward a couple weeks later. My equipment placement changed and so I could no longer make use of the super short cable
(giving to @T Bone
soon). What's left was my 0.3M cable. Strange enough, The 0.5M cable I sold to my neighbor was a little long for him, so he went out and bought a shorter cable as he heard from me that shorter was better. Then came the [COLOR=6633CC]
WireWorld Ultraviolet 7[/COLOR].. in 0.3 meter.
Sitting there beside him I thought to myself... If the WireWorld Starlight 7 0.3M & 0.5M sounded the same to my ears, wouldn't the Ultraviolet 7 as well? but wait.. the material and design is not on the same level as the Starlight 7 so in theory it should sound worse, or perhaps at this short length it shouldn't matter?
After another 6 or so hours of A/B testing with my buddy, we found the two to sounded exactly the same. Because of that reason, I will be departing my Starlight 7 0.3M and he him, his Starlight 0.5M. From now on we'll both use the [COLOR=6633CC]
WireWorld Ultraviolet 7[/COLOR]
(0.3M).
BUT WAIT.. THERE'S MORE.
HDMI transmission was made for audio and video. Television interlinking. Designers of audio circuits such as PS Audio
(among many others) simply made the HDMI port as a standard for sending and receiving I
2S data as they felt it was a good type of connection. It's more than good actually.. The HDMI connection is superior as it offers a balanced way to transmit data.
In I
2S internal protocol, these are the main bits that are transferred over.
- DATA (Serial Data) - also known as SDATA
- LRCLK (L/R Clock, Word Clock, or Frame Clock) - also known as LRCK, WCK, or WCLK..
- BCLK (Bit Clock or Serial Clock) - also known as SCLK, SCK, or BCK.
- MCLK (Master Clock) - also known as MCK
In HDMI, each of these paths are paired with its own independent ground
(return) thus becomes less susceptible to interruptions. There are other I
2S connectors used in audio such as the RJ45
(or DIN, D-Sub, BNC, etc). Some do it better than others. Some do NOT provide their data and clocks with it's own independent ground at the input/output thus hurts signal fidelity during transfer. For susceptible paths like I
2S, this increases jitter. Think of it like balanced vs single ended design.
Unbalanced I
2S, signal conductor becomes susceptible to noise
(which induces jitter).
Balanced I
2S, signal conductor becomes less susceptible to noise due the noise being canceled out
(through polarity inversion).
Now when it comes to the I
2S port
(HDMI) offered by Holo Audio Spring & Singxer SU-1, I wanted a cable that was worth the money and offered the least amount of diminishing returns. This was why i settled on a $6.95 super short cable from Sewell in the first place. It provided the same performance for a fraction of the price. Sure one could throw money in and buy the best cable out there and no doubt it'll perform well, but that's like buying a pricey condom for no reason. You end up with a Magnum XL, plenty of extra "headroom", but none of which you can actually use.
Anyways.. dot dot dot.. I wanted to understand why the [COLOR=6633CC]
WireWorld Ultraviolet 7[/COLOR] sounded as good as the more expensive
[COLOR=FF0000]WireWorld Starlight 7[/COLOR]. Was it because at 0.3M length material science didn't matter as much? What could it be? What is the inner workings? What sorcery is this!
The Starlight 7 was clearly better ON PAPER.
- 23 GA wire vs 24GA wire (thicker wire)
- 24 conductors vs 16 conductors (twice as much wire for the important stuff)
I had to think broader than just reading off specifications. To truly understand how well an HDMI cable can work for audio use
(I2S in particular), one must understand how it's pins are configured. Below is the configuration for Holo Audio Spring and Singxer SU-1.
If you pay close attention, the main pins used are 1, 3, 4, 6, 7, 9, 10, and 12. This carries the I
2S data and clocks.
Now if you look at a conventional HDMI cable, the grouping of the wires appear so:
As you can see, The vital wires
(or pins) are placed in the correct group brackets and not left floating, unshielded, or bunched together with what could be noisy. The problem with this conventional HDMI cable is those wires are not isolated enough and can suffer from cross-talk. It's group wires are only shielded from one another with the use of mylar aluminum foil. WireWorld offers both the foil as well as a copper braid over each grouping
(A, B, C, and D). By improving on signal fidelity one improves on jitter
(theoretically).
Now what does the
[COLOR=FF0000]WireWorld Starlight 7[/COLOR] achieve?
Well for starters it's 8 core wires that carries I
2S data is now twice the size
(now 20 gauge). It's "DNA HELIX" design correlates to its core wires being twisted in pairs. Now what does this translate to?
A thicker wire means more power handling and greater signal fidelity
(less resistance).
The intended purpose of twisted pairs is to cancel out electromagnetic interference and reducing cross-talk.
All important things in maintaining a pure signal for I
2S. But where does this leave us?
My theory is that at the recommended length for I
2S , the thickness in wire does NOT matter ENOUGH.
Improvements gained in a thicker cable with twisted pair, it loses in length. Length in which is extremely vital in I
2S transmission where every millimeter counts. Why? The fact is that twisted or braided wires use MORE wire than a single wire at the same length. Not only that, but now there are two wires open to picking up noise, not 1. Don't forget the Starlight 7 is a thicker cable and harder to bend.
The circuit traces that connects to the input or output of those HDMI connectors are nowhere near 24 gauge. A standard HDMI cable has 28 gauge, a high speed one has 24 gauge, but that is measured in long length usages. Bottom line is, WireWorld HDMI cables are overkill for I
2S transmission.. Even the affordable Chroma 7 should be more than sufficient for the task and I have doubts of it sounding any worse than both the
[COLOR=FF0000]WireWorld Starlight 7[/COLOR] &
[COLOR=FF0000] [/COLOR][COLOR=6633CC]
WireWorld Ultraviolet 7.[/COLOR]
Why am I not getting a Chroma then? Well I don't like yellow. Over time the inner materials may break down the copper thus decrease its conductivity. I prefer having a silver plating over my conductors. Last but not least.. the metal shell looks nice and offers extra shielding.