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Yamaha RX-A4A vs RX-A2A
One rung up the AVENTAGE ladder — which should you buy?
The short answer
Buy the Yamaha RX-A4A for the connectivity: a curated 40 Gbps HDMI bandwidth vs 24, and three stated HDMI outputs vs one. The amplifier step (110 vs 100W, identical context) is ~0.4 dB — real on paper, irrelevant in a room.
Both wear the AVENTAGE badge, both run YPAO RSC, both are 7.2 designs. The step-up money buys three stated things — and one of them is the HDMI spec most buyers assume both have.
Specifications · side by side · per-field provenance
● SOURCE-TRACKED| Spec | Yamaha RX-A4A | Yamaha RX-A2A |
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| Price | price unknown | $500 |
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| Brand | Yamaha | Yamaha |
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| Channel Config | 7.2 | 7.2 |
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| Main Channels | 7 | 7 |
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| Processing Channels | 7 | 7 |
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| Sub Pre Outs | 2 | 2 |
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| Height Channels | 2 | not stated |
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| Zone 2 Capable | Yes | Yes |
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| Watts Per Channel 8ohm | 110 | 100 |
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| THD Percent | 0.06 | 0.06 |
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| Power Measurement Channels Driven | two channels driven | unstated |
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| Impedance Range | Front: 4 Ω or more; Other: 6 Ω or more (default 8 Ω) | Front: 4 Ω or more; Other: 6 Ω or more (default 8 Ω) |
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| Impedance Min Ohms | 4 | 4 |
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| Impedance Max Ohms | 8 | 8 |
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| Dolby Atmos | Yes | Yes |
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| Dts X | Yes | Yes |
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| Auro 3d | No | No |
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| Room Correction System | YPAO RSC | YPAO RSC |
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| Measurement Mic Included | Yes | not stated |
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| HDMI Inputs | 7 | 7 |
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| HDMI Outputs | 3 | 1 |
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| HDMI Version | 2.1 | not stated |
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| HDMI Max Bandwidth Gbps | 40 | 24 |
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| HDMI Earc Port Count | 1 | 1 |
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| Max Passthrough Resolution | 4K 60 | 8K 60 |
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| HDR Support | HDR10, Dolby Vision, HLG, HDR10+ | Dolby Vision, HDR10+ |
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| VRR Passthrough | Yes | Yes |
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| ALLM Support | Yes | Yes |
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| Phono Input | Yes | Yes |
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| Wifi | Yes | Yes |
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| Bluetooth | Yes | Yes |
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| Airplay2 | Yes | Yes |
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| Musiccast | Yes | Yes |
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| Streaming Services | Spotify Connect, Pandora, Deezer, Qobuz | not stated |
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| Trigger Outputs Count | 1 | 1 |
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| Form Factor | full size | not stated |
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| Width Inches | 17.1 | 17.1 |
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| Height Inches | 7.5 | 6.8 |
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| Depth Inches | 17.4 | 14.6 |
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| Weight Lbs | 35.7 | 22.5 |
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| Zone 3 Capable | not stated | No |
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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
Power is like-for-like: 110W (RX-A4A) vs 100W (RX-A2A), both at 8Ω, two channels driven, 0.06% THD — about 0.4 dB. The stated differences that matter: the A4A carries a curated 40 Gbps HDMI bandwidth where the A2A's curated figure is 24 Gbps, and the A4A states three HDMI outputs to the A2A's one. Both share the same curated 7-channel processing count — the step-up does not add height channels.
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-A4A drive the KEF LS50 Meta?
Yamaha RX-A4A 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 Yamaha RX-A2A drive the KEF LS50 Meta?
Yamaha RX-A2A 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.
Check either one against your own build →Gaming & connectivity · answered from the spec sheets
Can the Yamaha RX-A4A and Yamaha RX-A2A pass 4K/120 through?
The Yamaha RX-A4A 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 Yamaha RX-A4A for the connectivity: a curated 40 Gbps HDMI bandwidth vs 24, and three stated HDMI outputs vs one. The amplifier step (110 vs 100W, identical context) is ~0.4 dB — real on paper, irrelevant in a room.
4K/120 gaming sourcesYamaha RX-A4A — Curated 40 Gbps HDMI bandwidth vs the A2A's 24 — the spec that actually gates full-rate 4K/120.
TV + projector + zone displayYamaha RX-A4A — 3 stated HDMI outputs vs 1.
A 5.1.2 that will never growYamaha RX-A2A — Same YPAO RSC, same 7-channel processing, 0.4 dB less power — the cheaper rung does the same job.
What our normalized data adds
NOT ON THE SPEC SHEETS- Like-for-like power: 110W vs 100W, both stated at 8Ω / two channels driven / 0.06% THD (~0.4 dB).
- The HDMI bandwidth fork inside one badge: curated 40 Gbps (A4A) vs 24 Gbps (A2A) — the AVENTAGE name alone doesn't tell you which side of the 4K/120 line you're on.
- 3 vs 1 stated HDMI outputs.
- Both state YPAO RSC and 7 curated processing channels — correction and channel count don't move with the price.
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