CARLSBAD, CALIF. (May 27, 2021)— Sound United LLC, parent company to Bowers & Wilkins™, Denon®, Marantz®, Polk Audio®, Definitive Technology®, Classé®, and Boston Acoustics®, today announced two new factory upgraded versions of the celebrated Denon AVR-X8500H and Marantz AV8805 flagship AV components and an upgrade program for existing owners of the two flagship models. The two new units, dubbed the Denon AVR-X8500H “A” and Marantz AV8805 “A” boast many exciting updates, including 8K/60Hz upscaling and passthrough, 4K/120Hz pass-through , HDR10+, Dynamic HDR, HDCP 2.3, as well as other HDMI 2.1 technologies. The factory upgraded Denon and Marantz units will gradually replace all existing Denon AVR-X8500H and Marantz AV8805 units. The Denon AVR-X8500HA will retail for US $4,299, and the Marantz AV8805A at $4,799.

In addition to this, and in accordance with Denon and Marantz’s history of advanced customer support, current owners of the Denon AVR-X8500H and Marantz AV8805 will have the opportunity to upgrade the HDMI/Digital board within their units to obtain the same features as the “A” components. The upgrade requires a hardware modification at a Denon and Marantz certified Service Center. Beginning June 15, 2021, this will be arranged on request by contacting Denon or Marantz directly via the Denon Site and Marantz Site for US$599 or CA$749. This upgrade service willl be offered both in the United States and Canada. For customers outside of the US and Canada, it is recommended to contact the local Denon or Marantz dealer or distributor for the availability of the upgrade given potential variations in price and availability.

Next-Gen HDMI Technologies Now Available
The improved components now also boast the latest HDMI technologies. Enjoy movies and shows with stunning picture quality thanks to a dedicated “8K” HDMI input enabling 8K/60Hz and 4K/120Hz video pass-through, new HDR format support including HDR10+ and Dynamic HDR, and a new HDMI feature called Quick Media Switching (QMS), which allows a source to instantly switch frame rate to eliminate screen blackout. For exceptional color, clarity and contrast the latest models still support HDR10, HLG (Hybrid Log Gamma) and Dolby Vision, as well as 4:4:4 Pure Color subsampling and BT.2020 pass-through.

Several new features give gamers an edge, including razor sharp motion clarity with 4K/120Hz pass through and Variable Refresh Rate (VRR) to reduce frame tearing and improve overall precision. Get a jump on the competition with Auto Low Latency Mode (ALLM) and Quick Frame Transport (QFT), each designed to reduce lag and improve stats. See the enemy before they see you with stunning 8K picture quality.

The improved products can also upscale existing HD and 4K content to 8K so more people can experience the power of 8K resolution. They also continue to support eARC (Enhanced Audio Return Channel), which allows lossless and object-based audio transmission like DTS:X and Dolby Atmos from TV apps or connected devices using a single HDMI cable.

A Variety of Upgraded Features


Denon AVR-X8500H"A" Marnantz AV8805”A” (A Version Factory and Field Upgrade)

Denon AVR-X8500H Marantz AV8805

8K60Hz and 4K120Hz Pass-through

Yes (A dedicated “8K” input and “Main”, ”Sub” outputs support up to FRL 40Gbps)

No (4K60Hz, up to TMDS 18Gbps)

HDR10+, Dynamic HDR, VRR, ALLM, QMS, QFT

Yes (all Inputs)

ALLM only


Up to 8K (all inputs)

Up to 4K (all inputs)

Copy Protection Standard

HDCP 2.3

HDCP 2.2

Availability and Upgradability
For owners of either the Denon AVR-X8500H or Marantz AV8805 who wish to perform the HDMI 2.1 upgrade, please visit the Denon Site or Marantz Site. for details. The latest factory upgraded models are now available at your local Denon or Marantz retailer, or at and

The process to upgrade the Denon AVR-X8500H or Marantz AV8805 follows:

  •  1. Customer visits Denon Site or Marantz Site Follows instructions, and checks out.
  •  2. United Radio, official repair partner of Denon and Marantz, will ship a box to the customer.
  •  3. A confirmation will be sent to the customer via email with instructions on what to do with the shipping carton. This will include details on how to affix an upgrade kit label to the box, and a prepaid shipping label.
  •  4. Customer ships carton to United Radio.
  •  5. United Radio receives product and performs upgrade within 48 hours.
  •  6. Return shipment sent out, customer receives shipping notification from United Radio with tracking.

About Denon
Denon is a trusted world leader in the manufacture of the highest-quality home theater, audio and software products since 1910. Denon is recognized internationally for innovative and groundbreaking products and has a long history of technical innovations, including the development and groundbreaking commercialization of pulse-code modulation (PCM) digital audio and the first 13-channel AV receiver. Denon Electronics is owned by Sound United LLC. For more information visit

About Marantz:
Marantz was founded in 1953 by Saul Marantz with a simple philosophy: getting the listener as close as possible to the original recording. Marantz’s love of music inspired an uncompromising ear and eye for detail and led to the development of products that would define excellence for generations of listeners. Tantamount to Saul Marantz’s original mission, Marantz product design, materials and components result in the Most Musical Sound to this day. Your music always sounds better on a Marantz. Marantz is a part of Sound United LLC. Additional information is available at

About Sound United
Sound United was founded in 2012 with a simple mission – to bring joy to the world through sound. Today, we’re one of the world’s largest portfolio audio companies and home to several legendary audio brands—Bowers & Wilkins™, Denon®, Marantz®, Polk Audio, Classé, Definitive Technology, HEOS, and Boston Acoustics®. Each brand boasts its own philosophy and unique approach to bringing home entertainment to life.

With centuries of collective experience, Sound United oversees the design and manufacture of a diverse array of premium audio products, including loudspeakers, sound bars, AV receivers, wireless speakers, amplifiers, turntables, and headphones. We create distinct and memorable listening experiences for a wide range of consumers in more than 130 countries. For more information on Sound United and our mission, please visit