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Dimensions
Size comparison
Beosound A1 (3rd Gen)TOPROCK SYS3 BT20 137 USB-C
| Beosound A1 (3rd Gen) | TOPROCK SYS3 BT20 137 USB-C | Difference | |
|---|---|---|---|
| Height | 46 mm | 137 mm | −91 mm |
| Width | 133 mm | 396 mm | −263 mm |
| Depth | 133 mm | 296 mm | −163 mm |
| Weight | 576 g | 2,800 g | −2,224 g |
Drawn to the same scale from the official dimensions (front and side).
Why is Beosound A1 (3rd Gen) better than TOPROCK SYS3 BT20 137 USB-C?
- Output power60 W vs 20 W3×
- Weight576 g vs 2,800 g4.9×
- Hi-res codec (LDAC / aptX HD / LHDC)Yes · TOPROCK SYS3 BT20 137 USB-C: No
- aptXYes · TOPROCK SYS3 BT20 137 USB-C: No
Why is TOPROCK SYS3 BT20 137 USB-C better than Beosound A1 (3rd Gen)?
- StereoNo · Beosound A1 (3rd Gen): Yes
Specifications
Side by side
| Sound | ||
| Output power | 60 W | 20 W |
| Speaker channels | 1.0 | — |
| Channel count | 1 | — |
| Lowest frequency | 54 Hz | — |
| Highest frequency | 20,000 Hz | — |
| Spatial / 3D audio | Yes | — |
| Stereo | No | Yes |
| Battery & charging | ||
| Battery life | 24 h | — |
| Charging time | 3 h | — |
| Power bank function | — | Yes |
| Mains powered | No | No |
| Battery powered (portable) | Yes | Yes |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.1 | 5 |
| Bluetooth codecs | aptX Adaptive, AAC, SBC | SBC |
| Hi-res codec (LDAC / aptX HD / LHDC) | Yes | No |
| aptX | Yes | No |
| LDAC | No | No |
| Multipoint (two devices) | Yes | — |
| USB-C | Yes | Yes |
| USB audio | Yes | — |
| Smart & streaming | ||
| Companion app | Yes | — |
| Design & build | ||
| Weight | 576 g | 2,800 g |
| Width | 133 mm | 396 mm |
| Height | 46 mm | 137 mm |
| Depth | 133 mm | 296 mm |
| Protection rating | IP67 | — |
| Water resistance (IPx) | IPx7 | — |
| Dust protection (IP) | 6 | — |
| Features | ||
| Hands-free calls | Yes | — |
| Party / stereo pairing | Yes | Yes |
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