Buy the Onkyo TX-RZ50 on the sheets — a higher matched-context power figure (120 vs a curated 100W at 8Ω/2ch), a stated THX Select badge, and eleven processing channels. The TX-RZ30's stated case is connectivity: two eARC ports and Chromecast built-in, which specific racks will value more than 1 dB.
As tracked by Home Theater Builder: the Onkyo TX-RZ30 tracks at $1,099; the Onkyo TX-RZ50 at $1,400.How we verify this data →
Both wear the RZ badge and both center on Dirac Live. The spec sheets rate their amplifiers under different headline conditions — our curated data adds the matched-context line that makes them comparable.
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 RZ30's headline is 170W into 6Ω with one channel driven at 1% THD — the generous test; its curated 8Ω/two-channel figure is 100W. The RZ50 states 120W under that same 8Ω/2ch/0.08% context (plus its own 250W/6Ω line). Matched context to matched context: 100 vs 120, under 1 dB but a real edge to the RZ50, which also states THX Certified Select where the RZ30's THX tier is unspecified in our data. The RZ30's stated counterpunches: TWO eARC-capable HDMI ports (the RZ50 states one), stated full-bandwidth Dirac, and Chromecast built-in on its stated streaming stack.
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-RZ30 drive the KEF LS50 Meta?
Onkyo TX-RZ30 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 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.
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.
Gaming & connectivity · answered from the spec sheets
Can the Onkyo TX-RZ30 and Onkyo TX-RZ50 pass 4K/120 through?
The Onkyo TX-RZ30 states 40 Gbps HDMI bandwidth — enough for full 4K/120; the Onkyo TX-RZ50 states 40 Gbps HDMI bandwidth — enough for full 4K/120.
The verdict
Buy the Onkyo TX-RZ50 on the sheets — a higher matched-context power figure (120 vs a curated 100W at 8Ω/2ch), a stated THX Select badge, and eleven processing channels. The TX-RZ30's stated case is connectivity: two eARC ports and Chromecast built-in, which specific racks will value more than 1 dB.
Sticker vs matched context, inside one brand: the RZ30's headline 170W is 6Ω/1ch/1% THD; its curated 8Ω/2ch figure is 100W — against the RZ50's stated 120W under the same conditions.
The RZ30 states TWO eARC-capable HDMI ports — unusual, and stated — vs one on the RZ50.
THX badges differ in specificity: Certified Select stated on the RZ50; the RZ30's THX tier is unspecified in our data.
Both state 9 amplified channels, Dirac Live, IMAX Enhanced, and 4–16Ω impedance ratings.
