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Onkyo TX-RZ50 vs Pioneer VSX-LX305
Same corporate family, opposite rating styles — which should you buy?
The short answer
Buy the Onkyo TX-RZ50 — its power rating is the honest one, it states the 4–16Ω impedance rating the Pioneer's sheet lacks, and it processes eleven channels to the LX305's curated nine, all on the same Dirac Live foundation. The LX305's bigger sticker was earned one channel at a time at ten times the distortion.
Onkyo and Pioneer receivers now come from the same company, which makes this pair a controlled experiment in spec-sheet philosophy: two nine-channel Dirac Live receivers whose power numbers were produced under nearly opposite conditions.
Specifications · side by side · per-field provenance
● SOURCE-TRACKED| Spec | Onkyo TX-RZ50 | Pioneer VSX-LX305 |
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| Price | $899 | price unknown |
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| Brand | Onkyo | Pioneer |
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| Channel Config | 5.2.4 | 7.2.2 |
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| Main Channels | 9 | 9 |
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| Processing Channels | 11 | 9 |
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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 | 120 | 170 |
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| Watts Per Channel 6ohm | 250 | 185 |
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| THD Percent | 0.08 | 1 |
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| Power Measurement Channels Driven | two channels driven | one channel driven |
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| Impedance Range | 4–16 ohms | not stated |
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| Impedance Min Ohms | 4 | not stated |
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| Impedance Max Ohms | 16 | not stated |
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| Dolby Atmos | Yes | Yes |
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| Dts X | Yes | Yes |
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| Imax Enhanced | Yes | Yes |
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| Room Correction System | Dirac Live (full bandwidth) | MCACC |
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| Measurement Mic Included | Yes | not stated |
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| HDMI Inputs | 7 | 6 |
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| HDMI Outputs | 2 | 2 |
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| HDMI Version | 2.1 | 2.1 |
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| HDMI Max Bandwidth Gbps | 40 | 40 |
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| HDMI Earc Port Count | 1 | 1 |
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| Max Passthrough Resolution | 8K 60 | 8K 60 |
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| HDR Support | HDR10+, Dolby Vision, HDR10, HLG | HDR10+, HDR10, HLG, Dolby Vision |
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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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| Ip Control | Yes | not stated |
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| Streaming Services | Spotify Connect, Tidal Connect, Deezer, Pandora, TuneIn, Amazon Music HD, DTS Play-Fi | Spotify Connect, Tidal Connect, Deezer, Amazon Music HD, TuneIn, DTS Play-Fi |
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| Trigger Outputs Count | 1 | 2 |
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| Form Factor | full size | full size |
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| Width Inches | 17.1 | 21.1 |
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| Height Inches | 7.9 | 10.4 |
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| Depth Inches | 15.7 | 18 |
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| Weight Lbs | 30.9 | 22.9 |
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| Power Consumption W | 850 | 760 |
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| Height Channels | not stated | 2 |
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| HDMI 21 Port Count | not stated | 8 |
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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
The RZ50 leads with the conservative line: 120W at 8Ω, two channels driven, 0.08% THD. The LX305's curated figure is 170W at 8Ω — with ONE channel driven at 1% THD, the generous test on both axes. As printed, 170 vs 120 cannot be ranked, and we won't pretend otherwise; corrected for conditions these are close amplifier classes. Both carry Dirac Live (the LX305 stated full-bandwidth). The RZ50 states a 4–16Ω impedance rating and eleven processing channels; the LX305's impedance range is unstated in our data and its curated processing count is nine.
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 Onkyo TX-RZ50 drive the KEF LS50 Meta?
Onkyo TX-RZ50 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 Pioneer VSX-LX305 drive the KEF LS50 Meta?
Pioneer VSX-LX305 publishes no rated impedance range, so the pairing with the KEF LS50 Meta (which dips to a stated 3.5Ω minimum) can't be verified from its spec sheet — we treat that as "can't check", not a pass.
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 Onkyo TX-RZ50 and Pioneer VSX-LX305 pass 4K/120 through?
The Onkyo TX-RZ50 states 40 Gbps HDMI bandwidth — enough for full 4K/120; the Pioneer VSX-LX305 states 40 Gbps HDMI bandwidth — enough for full 4K/120.
The verdict
Buy the Onkyo TX-RZ50 — its power rating is the honest one, it states the 4–16Ω impedance rating the Pioneer's sheet lacks, and it processes eleven channels to the LX305's curated nine, all on the same Dirac Live foundation. The LX305's bigger sticker was earned one channel at a time at ten times the distortion.
Trustworthy amplifier specOnkyo TX-RZ50 — 120W at 8Ω/2ch/0.08% vs 170W at 8Ω/1ch/1% — the smaller number is the harder test.
Low-impedance speakersOnkyo TX-RZ50 — A stated 4–16Ω rating; the Pioneer publishes no impedance range in our data.
Committed Pioneer householdsPioneer VSX-LX305 — Same Dirac Live full-bandwidth correction and nine amplified channels — the platform fundamentals genuinely match.
What our normalized data adds
NOT ON THE SPEC SHEETS- A same-company rating-philosophy split our context fields expose: 120W (8Ω/2ch/0.08% THD) vs a curated 170W (8Ω/ONE channel/1% THD) — different tests on two axes, flagged as non-comparable as printed.
- The RZ50 states a 4–16Ω impedance rating; the LX305's range is unstated in our data.
- Both are nine-channel Dirac Live receivers with zone 3 — the correction and topology parity is real; processing channels differ 11 vs a curated 9.
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