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The X8500H has a nicer remote with 'learning' capabilities to copy IR commands, macro capabilities, and also a 'Remote ID' setting so you can prevent conflicts with other Denon device remotes accidentally changing it.X8500H has a rear USB input in addition to the front USB, the rear port is rated to power devices so more practical for a streaming stick or cooling fan etc.

The X8500H can do a vertical stretch for use with anamorphic lenses (note: does not appear to work with full bandwidth 4K signals like 4K/60 4:4:4).

A quick check shows 5dB increase in SNR for the DAC in the X8500H

The X8500H has different DAC's specified, it lists the AKM AK4490EQ for the X8500H and the AKM AK4458VN for the X6400H.

Future HDMI 2.1 hardware upgrade to increase lifespan by supporting 8K resolution and more (the same way they offered the 'A' upgrade to the 7200/8802 for HDMI 2.0 in the last generation).

7.1ch multi-ch analog audio inputs, extra (3 vs.

The X8500H also has a 'pre-amp mode' which disconnects the amp section.

For example, if you're using a 5ch amp to power LCR+Surrounds in the main zone, you can repurpose the unused FL/FR and SL/SR amps in the AVR to power Zone 2/3 speakers (the X6400H only has predefined templates for amp assign).

X8500H also has a 'Custom' amp assign setting which allows you to map virtually any speaker binding post to any channel of output.

The X8500H can run a full 13.1ch Auro3D speaker layout and has FOUR pairs height speakers outputs, allowing you much more flexibility to configure your layout while maintaining optimal Atmos/DTS:X playback. And the only way to practically mix Auro + Atmos is to use a Front Height + Rear Height layout. The X6400H like other previous 11ch D+M models is limited to 10.1ch Auro3D (5.1 + 4 heights + VOG).

Even if you don't go beyond 7.1.4 Atmos, the X8500H has significantly better Auro3D support (and also less compromise with a dual use Atmos/Auro layout).Physically larger and heavier (51lbs vs.OK, I'm not going to do more than 7.1.4 Atmos. Because there are FOUR pairs of height speaker outputs (pre-out and speaker posts), with flexible assignment (including being able to assign Height4 to Front Wide output) you can do a complete Auro3D setup with five heights + VOG and still have another pair of height outputs for Top Middle or Front Wide use with Atmos. The above facilitates the ability to run BOTH a 13ch Auro3D setup and a 13ch (9.1.4 / 7.1.6) Atmos setup without having to ruin positioning for one or the other.15.2ch RCA pre-outs and 15 pairs of speaker binding posts - including 8 total height speaker outputs (with Height4 pair assignable to Front Wide).13 amplified channels and 13.1ch processing.Web Manual Direct Link (with PDF download available):Īudioholics Preview Article (with bullet points provided/approved by batpig & JD):

Created heos account on denon can't login to heos app