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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

Channels5.2 — stated
HDMI8K capable — stated
WirelessBluetooth — stated
TunerDAB — stated
Room correctionNot stated in this listing
Amazon referenceB0DK1CV5KJ (same reference on 5 Amazon marketplaces)
EAN4573211155600

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.