vs
9.4Sound6.8
4.9Connectivity4.9
Dimensions
Size comparison
Acton IVKilburn III
| Acton IV | Kilburn III | Difference | |
|---|---|---|---|
| Height | 171 mm | 150 mm | +21 mm |
| Width | 260 mm | 273 mm | −13 mm |
| Depth | 150 mm | 169 mm | −19 mm |
| Weight | 2,650 g | 2,800 g | −150 g |
Drawn to the same scale from the official dimensions (front and side).
Why is Acton IV better than Kilburn III?
- Output power110 W vs 50 W2.2×
- Hi-res codec (LDAC / aptX HD / LHDC)Yes · Kilburn III: No
- LDACYes · Kilburn III: No
- Highest frequency38,000 Hz vs 20,000 Hz+90%
- Weight2,650 g vs 2,800 g+6%
- Lowest frequency37 Hz vs 45 Hz+22%
Why is Kilburn III better than Acton IV?
Kilburn III has no measurable advantages in this pair.
Specifications
Side by side
| Sound | ||
| Driver type | Dynamic | Dynamic |
| Driver size | 101.6 mm | 101.6 mm |
| Output power | 110 W | 50 W |
| Speaker channels | Stereo | 2.0 |
| Channel count | 2 | 2 |
| Lowest frequency | 37 Hz | 45 Hz |
| Highest frequency | 38,000 Hz | 20,000 Hz |
| Spatial / 3D audio | — | Yes |
| Hi-Res Audio | Yes | — |
| Adjustable equaliser | Yes | Yes |
| Stereo | Yes | Yes |
| Battery & charging | ||
| Battery life | — | 50 h |
| Charging time | — | 3 h |
| Quick charge (claimed) | — | 20 min → 8 h |
| Fast charging support | — | Yes |
| Power bank function | — | Yes |
| Mains powered | Yes | No |
| Battery powered (portable) | No | Yes |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.3 | 5.3 |
| Bluetooth codecs | LDAC, LC3, AAC, SBC | LC3, AAC, SBC |
| Hi-res codec (LDAC / aptX HD / LHDC) | Yes | No |
| aptX | No | No |
| LDAC | Yes | No |
| Multipoint (two devices) | Yes | Yes |
| LE Audio | Yes | Yes |
| Auracast | Yes | Yes |
| USB-C | — | Yes |
| 3.5 mm jack / AUX | Yes | Yes |
| Smart & streaming | ||
| Spotify Connect | Yes | — |
| Companion app | Yes | Yes |
| Design & build | ||
| Weight | 2,650 g | 2,800 g |
| Width | 260 mm | 273 mm |
| Height | 171 mm | 150 mm |
| Depth | 150 mm | 169 mm |
| Protection rating | — | IP54 |
| Water resistance (IPx) | — | IPx4 |
| Dust protection (IP) | — | 5 |
| Features | ||
| Party / stereo pairing | Yes | — |
