Buy the Denon AVR-X1800H. Its power rating is honestly qualified where Yamaha's leaves the channels-driven condition unstated, and it's the only one of the two that states four HDMI 2.1 inputs and nine processing channels in our data.
As tracked by Home Theater Builder: the Denon AVR-X1800H tracks at $849; the Yamaha RX-A2A at $1,481.How we verify this data →
The budget-Atmos shortlist usually ends at these two: Denon's AVR-X1800H and Yamaha's RX-A2A ($849 vs $1,481 as tracked today). On paper the Yamaha has more watts; read the measurement conditions and the story changes.
Specifications · side by side · per-field provenance
● SOURCE-TRACKED
Spec
Denon AVR-X1800H
Yamaha RX-A2A
Price
$849
$1,481
Brand
Denon
Yamaha
Channel configuration
7.2
7.2
Main channels
7
7
Processing channels
9
7
Subwoofer pre-outs
2
2
Zone 2 capable
Yes
Yes
Zone 3 capable
No
No
Watts per channel (8 Ω)
80
100
THD (%)
0.08
0.06
Channels driven (power rating)
two channels driven
unstated
Impedance range
4 – 16 Ω/ohms
Front: 4 Ω or more; Other: 6 Ω or more (default 8 Ω)
Speaker impedance, min (Ω)
4
4
Speaker impedance, max (Ω)
16
8
Dolby Atmos
Yes
Yes
DTS:X
Yes
Yes
Room correction system
Audyssey MultEQ XT
YPAO RSC
Measurement mic included
Yes
not stated
HDMI inputs
6
7
HDMI outputs
1
1
HDMI max bandwidth (Gbps)
40
24
HDMI 2.1 ports
4
not stated
HDMI eARC ports
1
1
HDR support
HDR10, Dolby Vision, HLG, HDR10+, Dynamic HDR
Dolby Vision, HDR10+
VRR passthrough
Yes
Yes
ALLM passthrough
Yes
Yes
Phono input
Yes
Yes
Wi-Fi
Yes
Yes
Bluetooth
Yes
Yes
AirPlay 2
Yes
Yes
HEOS
Yes
not stated
Width (in)
17.1
17.1
Height (in)
6
6.8
Depth (in)
13.3
14.6
Weight (lbs)
19
22.5
Power consumption (W)
430
not stated
Auro-3D
not stated
No
Max passthrough resolution
not stated
8K 60
MusicCast
not stated
Yes
12 V trigger outputs
not stated
1
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
Denon's 80W is fully qualified: 8Ω, two channels driven, 0.08% THD — the conservative way to state power. Yamaha publishes 100W into 8Ω at 0.06% THD but does not state how many channels were driven; our catalog records that context as 'unstated' rather than guessing. A one-channel figure reads meaningfully higher than the same amplifier measured with two channels driven, so 100 vs 80 is not a like-for-like comparison — treat these as roughly the same class of amplifier.
Compatibility · computed, not written
Checked against a bookshelf that dips to a stated 3.7Ω like the KEF Q150: KEF Q150
Can the Denon AVR-X1800H drive the KEF Q150?
Denon AVR-X1800H states a 4Ω-minimum rating; the KEF Q150 dips to a stated 3.7Ω 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 Yamaha RX-A2A drive the KEF Q150?
Yamaha RX-A2A states a 4Ω-minimum rating; the KEF Q150 dips to a stated 3.7Ω 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 Denon AVR-X1800H and Yamaha RX-A2A pass 4K/120 through?
The Denon AVR-X1800H states 40 Gbps HDMI bandwidth — enough for full 4K/120; the Yamaha RX-A2A states 24 Gbps HDMI bandwidth, below the ~40 Gbps full 4K/120 needs.
The verdict
Buy the Denon AVR-X1800H. Its power rating is honestly qualified where Yamaha's leaves the channels-driven condition unstated, and it's the only one of the two that states four HDMI 2.1 inputs and nine processing channels in our data.
Movies in a small or medium roomEither — Both are 7.2 Atmos/DTS:X receivers with two sub pre-outs; read honestly, their amplifiers are the same class.
Gaming (4K/120 consoles)Denon AVR-X1800H — The X1800H states four HDMI 2.1 ports; the RX-A2A's HDMI 2.1 port count is unstated in our data.
Adding height speakers laterDenon AVR-X1800H — Nine stated processing channels leave the X1800H room to grow via an external amp; the RX-A2A states no processing-channel figure.
Where to buy
CHEAPEST FIRST · NOT COMMISSION-RANKED
Denon X1800H
Tracked at Best Buy · price not quotable from a search page
Denon's 80W is measured at 8Ω, two channels driven, 0.08% THD; Yamaha's 100W leaves channels-driven UNSTATED — our normalized data records the missing context instead of guessing, so the two stickers are flagged as not comparable.
The X1800H states 4 HDMI 2.1 ports and 9 processing channels; the RX-A2A states neither figure in our normalized data.
Room correction differs in kind: Audyssey MultEQ XT (Denon) vs YPAO RSC (Yamaha).
The tracked prices are on this page — $849 vs $1,481 today, a $632 gap; the class difference the spec sheets imply isn't there once the power stickers are normalized.
