Kordz NEO-S3 4K Ultra HD HDMI upgrade system now available


Huh? This sounds like snake oil, all you need is a high speed HDMI cable to get 4k, so what exactly is this doing?

If you've got an existing 30m hdmi run you're going to almost already need to have invested in a non-passive system anyway, as that length is going to suffer some pretty awful degradation.


Distinguished Member
No new cables are required for HDMI version 2 or in relation to the conveyance of Ultra HD 4K content.

Can existing HDMI cables support the higher bandwidths of HDMI 2.0 Specification?
Yes, existing High Speed HDMI Cables (wire only) will support the new higher bandwidths (up to 18Gbps).

HDMI 2.0 specification defined a new, more efficient signaling method, for speeds above 1.4b limits (10.2Gbps), to allow higher bandwidths (up to 18Gbps) over existing High Speed HDMI Wire Cables.
Does HDMI 2.0 require new cables?
No, HDMI 2.0 features will work with existing HDMI cables. Higher bandwidth features, such as [email protected]/60 (2160p) video formats, will require existing High Speed HDMI cables (Category 2 cables).
HDMI :: Manufacturer :: HDMI 2.0 :: FAQ for HDMI 2.0

Member 319784

Active Member
Exactly! If you have a previously installed, long HDMI cable...
A) It is unlikely to be 'High Speed' Cat 2 as you say, anything over 7/8 metres is most likely going to be 'Standard' speed.
B) Perhaps it is in an unreachable place, plastered in wall or chased under floorboards.

The NEO kit effectively turns any passive HDMI cable up to 30m into a High Speed HDMI cable, enabling it to work with a number of 4K formats, frame rates and bit-depths.


Distinguished Member
I'd like to see exactly what this box claims to be doing , because on the face of it , it does smack of snake oil.
30 meters is way beyond the reliable distance for a passive cable.
Attenuation is inherent for any cable that length , for the unit at the end , there may be no signal strong enough for it to operate on , for the unit at the start the 30 meter attenuation of the cable kicks in regardless so there still may be no signal at the end for the other unit to work with.

So were talking about spending 270 pounds on a system to try and salvage an inherently weak solution ( long HDMI cable ) to begin with !!

There are far better and far cheaper solutions for long HDMI runs.

These just sound like a hyped up in line booster units , and there are plenty of those on the market already at far less cost , and as most would know , they are not the best solution either !

Kevin Taylor

Novice Member
Hi Folks, Sorry for the hold up in responding. Let me shine a little light on what the phaseHD technology does. (Thanks for sending the link Joe!)

Like Andy1249 mentioned, what we've found (and heard from many installers) is that past 15m HDMI is a bit of a gamble, even at 1080p60. Making things even worse is the interop issues between the source and display that are exasperated at longer distances. At less than 10m for HDMI 1.4b I couldn't agree more, this is probably overkill, but once you hit 15m the signal is degraded enough that most receivers can't recover it.

What Neo provides is a double ended solution that helps to control aspects of the transmitter (voltage swing, low speed and DC buffering) to make it easier for the receiver to recover the signal regardless of cable length and data rate (no manual tuning). Our equalization stage is powerful enough to restore a 4K24 signal at 30m over a good quality 26AWG cable. We've actually seen 50m over 22AWG in our testing, but again that was on a good quality cable.

Outside of the High-speed video data, there is also the low speed and DC aspects of the signal. When you hit lengths beyond 20m, the capacitance of the cable will cause the DDC channel to shark-fin, which essentially slows the edges down so the receiver can't actually clock in the data. To resolve this you need to address the DDC lines from both sides of the long cable. Likewise, the 5V and hotplug signals need to be buffered to maintain the power up timing and ensure proper operation.

There are a lot of long-reach HDMI cable solutions available. There isn't a one size fits all, but there is a limit to what can be done over CATX cable (when you hit HDMI 2.0 data rates there will be a steep fall off of cable length because of cross talk and poor noise immunity). We've seen 6Gbps work over 20m of HDMI cable on our next generation solution, so it might not be time to give up on HDMI cable quite yet.

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