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 $1,100.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 $1,100 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
$1,100
Brand
Denon
Yamaha
Channel Config
7.2
7.2
Main Channels
7
7
Processing Channels
9
7
Sub Pre Outs
2
2
Zone 2 Capable
Yes
Yes
Zone 3 Capable
No
No
Watts Per Channel 8ohm
80
100
THD Percent
0.08
0.06
Power Measurement Channels Driven
two channels driven
unstated
Impedance Range
4 – 16 Ω/ohms
Front: 4 Ω or more; Other: 6 Ω or more (default 8 Ω)
Impedance Min Ohms
4
4
Impedance Max Ohms
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 21 Port Count
4
not stated
HDMI Earc Port Count
1
1
HDR Support
HDR10, Dolby Vision, HLG, HDR10+, Dynamic HDR
Dolby Vision, HDR10+
VRR Passthrough
Yes
Yes
ALLM Support
Yes
Yes
Phono Input
Yes
Yes
Wifi
Yes
Yes
Bluetooth
Yes
Yes
Airplay2
Yes
Yes
Heos
Yes
not stated
Width Inches
17.1
17.1
Height Inches
6
6.8
Depth Inches
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
Trigger Outputs Count
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 $1,100 today, a $251 gap; the class difference the spec sheets imply isn't there once the power stickers are normalized.
