Onkyo TX-SR3100 5.2 channel AV receiver, 8K review
A 5.2 receiver with an 8K-capable HDMI board — the board is what dates a receiver, and this one is specified for a resolution beyond what most systems will use.
The bottom line The accessible receiver with a modern board — right for a 5.1 system that will stay 5.1, and the wrong starting point if height channels are the plan.
What the board buys
An 8K-capable HDMI section. The content does not exist in any quantity, and the specification is a useful proxy: a board built for that bandwidth generally handles 4K at 120 Hz with variable refresh rate, which is the thing a console actually needs.
Why the channel count is the real decision
5.2 drives five speakers. A 5.1 system fits; a 5.1.2 with height channels does not, because that needs seven amplifiers. If height is ever part of the plan, this receiver is the wrong starting point — and if it is not, the two spare channels on a 7.2 are money unspent.
What is not stated
Room correction. It is the feature that changes a real living room most, and the listing does not say which system, if any, is included. Worth confirming in the full specification.
The tuner
DAB, which turns the receiver into a household radio. Minor, and the kind of thing that gets used far more than the surround processing.
Setting expectations
This is the entry to a real receiver: proper amplification, real speaker terminals, room to place speakers where they belong. That step matters more than anything on the specification sheet above it.
Availability
On sale from 396 € to 436 € on the German, French, Italian and Spanish Amazon stores at the time of checking.
Listed but with no offer on the British Amazon store — the reference exists there and nobody is currently selling it.
Not found on the American Amazon store, where the buy link falls back to a local search rather than to a page that does not exist.
Prices and availability are what Keepa reported on the date this page was updated; both move.
Prices quoted in this text were read on 4 September 2026. The live price is at the top of the page.
What we like, and what we don't
Strengths
An 8K-capable HDMI board, which is the part of a receiver that ages first
Five channels and two subwoofer outputs — enough for a full 5.1 with a second subwoofer
The most accessible entry into a proper receiver in this catalogue
Compromises
Five channels leaves no spare for height speakers without replacing the receiver
8K passthrough is a specification most households will never use
Room correction is not stated in this listing
Specifications
Channels
5.2 — stated
HDMI
8K capable — stated
Wireless
Bluetooth — stated
Tuner
DAB — stated
Room correction
Not stated in this listing
Amazon reference
B0DK1CV5KJ (same reference on 5 Amazon marketplaces)
EAN
4573211155600
Questions people actually ask
Is 8K passthrough worth anything?
Not for content — there is very little. What the board being specified for 8K usually indicates is that it also handles 4K at 120 Hz with the gaming features, and that is genuinely useful. The headline figure is a proxy for the useful one.
Will 5.2 limit me later?
If you later want height channels, yes: a 5.2 receiver drives five speakers, and a 5.1.2 layout needs seven. That is the specific upgrade this receiver cannot follow you into, and it is worth knowing at purchase rather than discovering.
A 7.2 receiver from the house that states power with its conditions — the specification style that makes a receiver comparable to anything else that does the same.
Best for: A first proper surround system, with enough channels to add height speakers later without replacing the receiver.
5.1 channels · Bluetooth 5.3 · optical and coaxial in · USB · FM · 2 microphone inputs · echo · RCA
A 5.1 amplifier with two microphone inputs and echo — which places it between a home cinema receiver and a karaoke amplifier, and the page says which parts serve which.
Best for: A room that wants five speakers driven cheaply from an optical output, and where karaoke is a real use rather than a joke.
7.2 channels · Dolby Atmos Height Virtualizer · gaming features · voice control · network receiver
A 7.2 network receiver with a height virtualiser — processing that produces height without ceiling speakers, and which the maker names rather than implies.
Best for: A room where ceiling speakers are impossible and a console is part of the system.