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Denon and Marantz receivers built since May are free of the HDMI 2.1 bug

Denon and Marantz receivers built since May are free of the HDMI 2.1 bug
(Image credit: Future)

Earlier this year we reported how a major HDMI error had blighted Denon and Marantz's 2020 AV receivers. Well, good news: Sound United, the company that owns both brands, has finally beaten the bug.

According to Forbes, all Denon and Marantz flagship receivers manufactured after May 2021 are officially glitch-free. This is because the latest units are fitted with a new HDMI 2.1 chip that don’t suffer the same flaws.

The bug was originally caused by a faulty HDMI 2.1 chip that prevented some AVRs supporting 4K gaming at 120Hz via the Xbox Series X.

But how do you ensure you get one of the newer, glitch-free home cinema amplifiers? Denon has tweaked the serial number of the new models: numbers that end with serial numbers from 70001 onwards should be bug-free, as they will have been manufactured after May 2021 and boast the upgraded HDMI 2.1 chip.

Of course, that's no use if you've already splashed out a not inconsiderable sum on an AVC-X6700H, AVC-X4700H, AVC-X3700H, AVR-X2700H, AVR-S960H, AVR-A110, or Marantz AV7706, SR8015, SR7015, SR6015, SR5015 or NR1711. (And in Europe, the Denon AVC-A110, Denon AVC-X6700H, Denon AVC-X3700H, Denon AVR-X2700H DAB and Marantz SR5015 DAB)

If that's you, you'll need to get hold of Sound United's external HDMI adaptor, which contains the new chip and corrects the bug. Simply fill out the form on the Denon or Marantz website to get one for free. 

Sound United says it has been "working tirelessly" to address this long-running HDMI issue. Fingers crossed Denon and Marantz receivers play nice with any device you care to connect from now on.


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Tom has been writing about tech for 17 years, first on staff at T3 magazine, then in a freelance capacity for Men's Health, ShortList, The Sun, The Mail on Sunday, The Daily Telegraph and many more (including What Hi-Fi?). His specialities include mobile tech, electric cars and video streaming.