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I have been using Wireworld Starlight with my Sony 4K TV and Oppo UDP-203. No issues with 4K handshake and PQ/AQ is the very best. The cable comes with locking plugs for very secure connection.
They are not cheap but one of the very few certified 4K spec cables available today.
Some may suggest that almost all HDMI cables are Made in China and rest is all marketing gimmick. I suggest you to buy couple of brands and let your ears and eyes guide you on the very best cable in your setup.
I like the inexpensive powered HDMI cables from Monoprice - Redmere? May have the name wrong.
I paid $xxxx for an HDMI cable with magic wire from a dealer for my universal player to my flatscreen The thing wouldn't even pass a signal. I used the stock cable that was too short and it did fine. I returned the megabucks cable and the dealer told me my player firmware was bad, and so on. He gave me another one to try. Nope.
As I understand it all other things being equal the key condition is that all of the "bits" in parallel get there at the same time. This is analogous to copper and fiber "repeaters" on the phone network and internet. The Redmere uses power/and a chip to achieve this. With an 18MHz bandwidth all the bits had better get there at the same time for a lustrous picture. One doesn't need expensive gold or silver wire for a digital signal. Save your money - try a Redmere.
I used to use the Redmere cable for my plasma TV, and it's very good (especially for the money). On the advice of a fellow Audiogon member, I tried an HDMI cable from ApolloAV. (the 1.4 version not the 2.) that is silver plated copper and sells for $20.00. It bested the Redmere very noticeably. A good friend recently sent me the link above for the D Tech cable and said it was even better than the Apollo. I bought one and he was correct. Try one. It's a no brainer for the money.
I use a 33 foot Redmere for my video processor to projector run. I had to do this because another 23awg Beldon cable wasn't working. Though, I don't know about using Redmere for short run or audio purposes.
That being said, I recently discovered that a lower cost Beldon cable was not performing properly. A 5 foot Beldon Series FE cable that is supposed to be "Premium certified" to support 4K and 18Gbps bandwidth was actually smearing the sound when just using 1080p resolution and normal old compressed dolby digital. I'm was originally using this Neotech cable:
I went back to using this and it removed all the smeared audio effect. Audio was crystal clear using this cable. It's only just a "HDMI 1.4" certified cable, but it still is sonically superior to the Beldon.
One thing I have figured out here is that silver/silver-plated makes a significant difference for digital/hdmi cables. The Wire World stuff may be better than my Neotech, but I haven't felt a need to go that direction yet.