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  3. Stanmore III vs GX-30ARC

Marshall Stanmore III vs Onkyo GX-30ARC

What Stanmore III does better (1) and where GX-30ARC wins (2) — every spec side by side.

Marshall Stanmore III
Marshall · 2022Stanmore III
4.6Score
1 advantage≈ $280
Higher score
vs
Onkyo GX-30ARC
Onkyo · 2025GX-30ARC
2 advantages≈ $280
7.8Sound8.4
Dimensions

Size comparison

Stanmore IIIGX-30ARC
350 × 203188146 × 220170
Stanmore IIIGX-30ARCDifference
Height203 mm220 mm−17 mm
Width350 mm146 mm+204 mm
Depth188 mm170 mm+18 mm

Drawn to the same scale from the official dimensions (front and side).

Why is Stanmore III better than GX-30ARC?

  1. Lowest frequency45 Hz vs 51 Hz+13%

Why is GX-30ARC better than Stanmore III?

  1. Output power80 W vs 100 W+25%
  2. Highest frequency20,000 Hz vs 22,000 Hz+10%
Specifications

Side by side

Sound
Output power80 W100 W
Speaker channelsStereo2.0
Channel count—2
Lowest frequency45 Hz51 Hz
Highest frequency20,000 Hz22,000 Hz
StereoYesYes
Battery & charging
Mains poweredYesYes
Battery powered (portable)NoNo
Connectivity
WirelessYesYes
Bluetooth version5.25.3
Bluetooth codecsSBCSBC
Hi-res codec (LDAC / aptX HD / LHDC)NoNo
aptXNoNo
LDACNoNo
LE AudioYes—
USB-C—Yes
3.5 mm jack / AUXYes—
HDMI eARC / ARCYes—
Optical input—Yes
Smart & streaming
Wi-FiYes—
Companion appYes—
Design & build
Weight4,250 g—
Width350 mm146 mm
Height203 mm220 mm
Depth188 mm170 mm
Water resistance (IPx)IPx0—
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