Buy the Denon AVR-X1800H. It states nine processing channels against the Yamaha's seven — the decoding room to add a height pair on an external amplifier — a 4–16Ω impedance range on every channel rather than a front-pair exception, four HDMI 2.1 ports where our RX-V6A row records no 2.1-port count, and a measurement microphone in the box that the Yamaha row does not state. Buy the Yamaha RX-V6A if a seventh HDMI input, a stated 8K/60 passthrough figure or a 12V trigger output is on your list. Neither choice should rest on the watt stickers: 100W and 80W are both stated at 8Ω with two channels driven, but at 0.06% THD against 0.08%, so they are reported here and ranked nowhere.
As tracked by Home Theater Builder: the Yamaha RX-V6A tracks at $960; the Denon AVR-X1800H at $849.How we verify this data →
Yamaha's RX-V6A and Denon's AVR-X1800H are the two receivers a first Atmos system usually comes down to — $960 vs $849 in the price row above. Their power ratings agree on three conditions out of four, which is closer than most pairs on this site get.
Specifications · side by side · per-field provenance
● SOURCE-TRACKED
Spec
Yamaha RX-V6A
Denon AVR-X1800H
Price
$960
$849
Brand
Yamaha
Denon
Channel configuration
7.2
7.2
Main channels
7
7
Processing channels
7
9
Subwoofer pre-outs
2
2
Zone 2 capable
Yes
Yes
Watts per channel (8 Ω)
100
80
THD (%)
0.06
0.08
Channels driven (power rating)
two channels driven
two channels driven
Impedance range
Front: 4 Ω or more; Other: 6 Ω or more (default 8 Ω)
4 – 16 Ω/ohms
Speaker impedance, min (Ω)
4
4
Speaker impedance, max (Ω)
8
16
Dolby Atmos
Yes
Yes
DTS:X
Yes
Yes
Room correction system
YPAO
Audyssey MultEQ XT
HDMI inputs
7
6
HDMI outputs
1
1
HDMI max bandwidth (Gbps)
24
40
HDMI eARC ports
1
1
Max passthrough resolution
8K 60
not stated
HDR support
HDR10, Dolby Vision, HLG
HDR10, Dolby Vision, HLG, HDR10+, Dynamic HDR
VRR passthrough
Yes
Yes
ALLM passthrough
Yes
Yes
Phono input
Yes
Yes
Wi-Fi
Yes
Yes
Bluetooth
Yes
Yes
AirPlay 2
Yes
Yes
MusicCast
Yes
not stated
12 V trigger outputs
1
not stated
Width (in)
17.1
17.1
Height (in)
6.8
6
Depth (in)
14.9
13.3
Weight (lbs)
21.6
19
Zone 3 capable
not stated
No
Measurement mic included
not stated
Yes
HDMI 2.1 ports
not stated
4
HEOS
not stated
Yes
Power consumption (W)
not stated
430
Shaded rows differ · green dot = lab-measured · amber = manufacturer-verified · blue = retailer/community-reported · grey = estimated · “not stated” means exactly that
Reading the numbers honestly
Both rows state their power into 8Ω with TWO channels driven, so three of the four conditions match; they differ on the distortion point, 0.06% THD on the Yamaha against 0.08% on the Denon. That is a small mismatch by the standards of this category, but it is still a mismatch, so 100W and 80W are reported here and ranked nowhere. What is comparable is everything else. The Denon states nine processing channels against seven — decoding for a height pair that waits on an external amplifier — a 4–16Ω range on every channel against the Yamaha's stated 'front 4Ω or more, other channels 6Ω or more', four HDMI 2.1 ports where the Yamaha row states no 2.1-port count, and a measurement microphone in the box that our RX-V6A row does not mention. The Yamaha answers with a seventh HDMI input against six, a stated 8K/60 passthrough figure where our Denon row records no passthrough resolution at all, a 12V trigger output, and a 24 Gbps HDMI bandwidth figure that is manufacturer-stated where the Denon's larger 40 Gbps figure comes from a retailer listing. Room correction is YPAO against Audyssey MultEQ XT: two platforms, not two tiers. One three-state note — the Denon states Zone 3 as an explicit No, where our Yamaha row has no Zone 3 field at all.
Compatibility · computed, not written
Checked against a bookshelf that dips to a stated 3.5Ω like the KEF LS50 Meta: KEF LS50 Meta
Can the Yamaha RX-V6A drive the KEF LS50 Meta?
Yamaha RX-V6A states a 4Ω-minimum rating; the KEF LS50 Meta dips to a stated 3.5Ω minimum, a little below that floor. Most receivers handle a marginal dip at normal volumes — it's worth watching only at very high output on an entry-level unit.
Can the Denon AVR-X1800H drive the KEF LS50 Meta?
Denon AVR-X1800H states a 4Ω-minimum rating; the KEF LS50 Meta dips to a stated 3.5Ω minimum, a little below that floor. Most receivers handle a marginal dip at normal volumes — it's worth watching only at very high output on an entry-level unit.
Computed from the catalog's normalized fields — the same fields the builder's compatibility engine reads. A missing field reads as "can't check", never as a pass.
Gaming & connectivity · answered from the spec sheets
Can the Yamaha RX-V6A and Denon AVR-X1800H pass 4K/120 through?
The Yamaha RX-V6A states 24 Gbps HDMI bandwidth, below the ~40 Gbps full 4K/120 needs; the Denon AVR-X1800H states 40 Gbps HDMI bandwidth — enough for full 4K/120.
The verdict
Buy the Denon AVR-X1800H. It states nine processing channels against the Yamaha's seven — the decoding room to add a height pair on an external amplifier — a 4–16Ω impedance range on every channel rather than a front-pair exception, four HDMI 2.1 ports where our RX-V6A row records no 2.1-port count, and a measurement microphone in the box that the Yamaha row does not state. Buy the Yamaha RX-V6A if a seventh HDMI input, a stated 8K/60 passthrough figure or a 12V trigger output is on your list. Neither choice should rest on the watt stickers: 100W and 80W are both stated at 8Ω with two channels driven, but at 0.06% THD against 0.08%, so they are reported here and ranked nowhere.
Comparable powerEither — Reported, not ranked: 100W and 80W are both stated at 8Ω with two channels driven, but at 0.06% THD against 0.08% THD — the same conditions except the one that decides the reading.
Adding a height pair laterDenon AVR-X1800H — Nine stated processing channels against seven — two channels of decoding waiting for an external amplifier.
4Ω speakers all roundDenon AVR-X1800H — A stated 4–16Ω range on every Denon channel; the Yamaha states 4Ω or more on the front pair and 6Ω or more everywhere else.
Number of sourcesYamaha RX-V6A — Seven stated HDMI inputs against six, plus a 12V trigger output our Denon row does not carry.
HDMI you can sourceEither — The Yamaha's 24 Gbps is manufacturer-stated and it states 8K/60 passthrough; the Denon's 40 Gbps is retailer-sourced but it states four 2.1 ports and no passthrough figure — each row fills a gap the other leaves.
Room correction in the boxDenon AVR-X1800H — Audyssey MultEQ XT against YPAO, with a measurement microphone stated on the Denon row only.
Where to buy
CHEAPEST FIRST · NOT COMMISSION-RANKED
Yamaha RX-V6A
Tracked at Best Buy · price not quotable from a search page
The watt figures share three conditions out of four and differ on the fourth: 100W (Yamaha) and 80W (Denon) are both 8Ω with two channels driven, but at 0.06% THD against 0.08% — reported here, ranked nowhere.
Processing channels are nine against seven, which is the concrete difference for anyone planning height speakers on an external amplifier.
Impedance is stated in different kinds: 4–16Ω on every Denon channel against 'front 4Ω or more, other channels 6Ω or more' on the Yamaha, so the Yamaha's surrounds carry a different rating from its mains.
HDMI provenance runs against the headline number: the Yamaha's 24 Gbps is manufacturer-stated while the Denon's 40 Gbps comes from a retailer listing — and only the Denon row states a 2.1-port count (four), while only the Yamaha row states a passthrough resolution (8K/60).
Only the Denon row states that a measurement microphone is included; only the Yamaha row states a 12V trigger output and a seventh HDMI input.
Three-state honesty: the Denon states Zone 3 as an explicit No, where our RX-V6A row has no Zone 3 field at all — a stated no and a silence are different data.
