Try both in a build →Pioneer VSX-LX305 in the slot, Pioneer VSX-LX505 one swap away.
The short answer
Buy the Pioneer VSX-LX305 unless you need the LX505's stated eight HDMI 2.1 ports or its eleven processing channels — the amplifier difference is ~0.25 dB under an identical (if generous) context, and the Dirac Live correction is the same stated system on both.
Both of Pioneer's enthusiast receivers carry full-bandwidth Dirac Live and nine amplified channels. For once the generous house rating style is at least consistent, so the two sheets can be compared with each other.
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
Both curated figures share the same generous context — one channel driven at 1% THD into 8Ω — so 170W (LX305) vs 180W (LX505) IS like-for-like within the house style: about 0.25 dB, nothing. The stated differences that matter: the LX505 states eight HDMI 2.1 ports and eleven curated processing channels to the LX305's nine, with a 40 Gbps curated bandwidth on both. Neither sheet states an impedance range in our data — a shared silence worth knowing before pairing low-dipping speakers.
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 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.
Can the Pioneer VSX-LX505 drive the KEF LS50 Meta?
Pioneer VSX-LX505 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.
Buy the Pioneer VSX-LX305 unless you need the LX505's stated eight HDMI 2.1 ports or its eleven processing channels — the amplifier difference is ~0.25 dB under an identical (if generous) context, and the Dirac Live correction is the same stated system on both.
The house rating style is generous but CONSISTENT: 170W vs 180W, both curated at 8Ω / one channel driven / 1% THD — so the ~0.25 dB gap is real, unlike most cross-brand sticker fights.
The LX505 states eight HDMI 2.1 ports and carries 11 curated processing channels vs 9 — the actual step-up content.
Neither Pioneer states a speaker impedance range in our data — a shared disclosure gap the spec pages don't admit.
Both state full-bandwidth Dirac Live, IMAX Enhanced, and zone 3 — platform parity where it counts.
