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Yamaha RX-A6A vs RX-A8A
Yamaha's two flagships — which should you buy?
The short answer
Buy the Yamaha RX-A6A unless you need eleven amplified channels or Auro-3D — the flagship RX-A8A's amplifier is rated identically (150W, same context), so the premium buys topology and formats, not power. For a 5.x.4 room the A6A's nine amplified channels already cover the whole layout.
The top of the AVENTAGE range, where the surprise is what the flagship premium does NOT buy: more rated power. Both state exactly the same amplifier figure.
Specifications · side by side · per-field provenance
● SOURCE-TRACKED| Spec | Yamaha RX-A6A | Yamaha RX-A8A |
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| Price | price unknown | $3,300 |
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| Brand | Yamaha | Yamaha |
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| Channel Config | 9.2 | 11.2 |
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| Main Channels | 9 | 11 |
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| Processing Channels | 11 | 11 |
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| Sub Pre Outs | 2 | 2 |
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| Zone 2 Capable | Yes | Yes |
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| Zone 3 Capable | Yes | Yes |
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| Watts Per Channel 8ohm | 150 | 150 |
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| THD Percent | 0.06 | 0.06 |
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| Power Measurement Channels Driven | two channels driven | two channels driven |
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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 | Yes | not stated |
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| Room Correction System | YPAO RSC | YPAO RSC |
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| HDMI Inputs | 7 | 7 |
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| HDMI Outputs | 3 | 3 |
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| HDMI Max Bandwidth Gbps | 40 | 40 |
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| HDMI Earc Port Count | 1 | 1 |
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| HDMI 21 Features Native At Launch | No | not stated |
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| Max Passthrough Resolution | 4K 60 | 4K 60 |
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| HDR Support | HDR10, Dolby Vision, HLG | HDR10, Dolby Vision, HLG |
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| VRR Passthrough | Yes | not stated |
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| ALLM Support | Yes | not stated |
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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, Tidal Connect, Deezer, Pandora, Amazon Music HD, Qobuz | Spotify Connect, Amazon Music HD, Pandora, Tidal Connect, Deezer, Qobuz |
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| Form Factor | full size | full size |
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| Width Inches | 17.1 | 17.1 |
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| Height Inches | 7.5 | 7.5 |
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| Depth Inches | 17.4 | 18.8 |
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| Weight Lbs | 41.2 | 47.2 |
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| Alexa Built In | not stated | Yes |
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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
150W at 8Ω, two channels driven, 0.06% THD — stated identically on both. What the RX-A8A adds is channels and formats: 11 amplified channels to the A6A's 9, stated Auro-3D decoding, three stated full-bandwidth HDMI 2.1 ports, and a stated 8K/60 passthrough ceiling. Both carry 11 curated processing channels and YPAO RSC. One curated honesty flag on the A6A: its HDMI 2.1 feature set is recorded as not native at launch (delivered by later update) — worth knowing when buying used or old stock.
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-A6A drive the KEF LS50 Meta?
Yamaha RX-A6A 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-A8A drive the KEF LS50 Meta?
Yamaha RX-A8A 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-A6A and Yamaha RX-A8A pass 4K/120 through?
The Yamaha RX-A6A states 40 Gbps HDMI bandwidth — enough for full 4K/120; the Yamaha RX-A8A states 40 Gbps HDMI bandwidth — enough for full 4K/120.
The verdict
Buy the Yamaha RX-A6A unless you need eleven amplified channels or Auro-3D — the flagship RX-A8A's amplifier is rated identically (150W, same context), so the premium buys topology and formats, not power. For a 5.x.4 room the A6A's nine amplified channels already cover the whole layout.
7.x.4 from one chassisYamaha RX-A8A — 11 amplified channels stated vs 9 — the only way to power that layout without an external amp.
Auro-3D contentYamaha RX-A8A — Stated on the A8A; not stated on the A6A.
5.x.4 and sanityYamaha RX-A6A — Identical 150W rating, same YPAO RSC, same 11 curated processing channels — and nine amplified channels already cover a full 5.x.4.
What our normalized data adds
NOT ON THE SPEC SHEETS- The flagship premium buys ZERO rated watts: both state 150W at 8Ω / two channels driven / 0.06% THD — identical value, identical context.
- 11 vs 9 amplified channels (both with 11 curated processing channels) — the A8A powers a 7.x.4 layout natively; the A6A needs an external amp for the last pair.
- The A8A states Auro-3D and three full-bandwidth HDMI 2.1 ports; the A6A carries a curated flag that its HDMI 2.1 features were NOT native at launch (later firmware) — a used-market caveat our data preserves.
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