Try both in a build →Marantz Cinema 50 in the slot, Marantz CINEMA 40 one swap away.
The short answer
Buy the Marantz Cinema 50 for most rooms — the topology that defines this tier (9.4, four independent subs, XT32) is identical on both sheets. The CINEMA 40's honest case is an amplifier rated higher under a stricter THD test plus more inputs and triggers — a custom-install case more than a listening one.
As tracked by Home Theater Builder: the Marantz Cinema 50 tracks at $2,000; the Marantz CINEMA 40 at $3,800.How we verify this data →
Two 9.4 receivers from the same family, same XT32 correction, same four independent sub outs. The step-up money buys an amplifier measured under a harder test — and more back-panel plumbing.
Specifications · side by side · per-field provenance
● SOURCE-TRACKED
Spec
Marantz Cinema 50
Marantz CINEMA 40
Price
$2,000
$3,800
Brand
Marantz
Marantz
Channel configuration
9.4
9.4
Main channels
9
9
Processing channels
11
11
Subwoofer pre-outs
4
4
Zone 2 capable
Yes
Yes
Zone 3 capable
No
Yes
Watts per channel (8 Ω)
110
125
THD (%)
0.08
0.05
Channels driven (power rating)
two channels driven
two channels driven
Impedance range
4 – 16 Ω/ohms
4 – 16 Ω/ohms
Speaker impedance, min (Ω)
4
4
Speaker impedance, max (Ω)
16
16
Dolby Atmos
Yes
Yes
DTS:X
Yes
Yes
Auro-3D
Yes
Yes
IMAX Enhanced
Yes
Yes
Room correction system
Audyssey MultEQ XT32
Audyssey MultEQ XT32
Measurement mic included
Yes
Yes
HDMI inputs
6
7
HDMI outputs
3
3
HDMI max bandwidth (Gbps)
40
40
HDMI eARC ports
1
1
HDR support
HDR10, HLG, Dolby Vision, HDR10+, Dynamic HDR
HDR10, HLG, Dolby Vision, HDR10+, Dynamic HDR
ALLM passthrough
Yes
Yes
Phono input
Yes
Yes
Wi-Fi
Yes
Yes
Bluetooth
Yes
Yes
AirPlay 2
Yes
Yes
HEOS
Yes
Yes
IP control
Yes
Yes
Streaming services
Spotify Connect, TuneIn, Pandora, Deezer, Amazon Music HD
Spotify Connect, TuneIn, Pandora, Amazon Music HD, Deezer
12 V trigger outputs
1
3
Form factor
full size
full size
Width (in)
17.4
17.3
Height (in)
6.5
6.5
Depth (in)
15.5
15.8
Weight (lbs)
24
32.4
Power consumption (W)
680
710
Max passthrough resolution
not stated
8K 60
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 power figures differ on two axes at once, in the step-up's favor: the CINEMA 40's curated rating is 125W at 0.05% THD against the Cinema 50's 110W at 0.08%, both at 8Ω with two channels driven. Rated higher under the stricter distortion threshold, its advantage is at least what's printed — though still ~0.6 dB. Elsewhere the 40 states seven HDMI inputs to the 50's six and three 12V trigger outputs to the 50's one. Topology, correction, and the 4–16Ω rating are identical stated fields.
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 Marantz Cinema 50 drive the KEF LS50 Meta?
Marantz Cinema 50 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 Marantz CINEMA 40 drive the KEF LS50 Meta?
Marantz CINEMA 40 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.
Buy the Marantz Cinema 50 for most rooms — the topology that defines this tier (9.4, four independent subs, XT32) is identical on both sheets. The CINEMA 40's honest case is an amplifier rated higher under a stricter THD test plus more inputs and triggers — a custom-install case more than a listening one.
