Short answer: the EarFun Uboom Slim for smoothness, the W-King T9 for output and battery. The two are priced within pennies at $79 and $111.23, but the T9 claims 80W, 106dB max volume and a 24-hour battery with power bank function, at the cost of upper-mid peaks that sound a bit harsh. The Uboom Slim answers with IPX7 build, 16 hours and smooth, volume-compensated sound, though its bass is not as deep.
Buy the EarFun Uboom Slim ($79) for a medium speaker; the W-King T9 ($111.23) suits a large speaker instead.
There is a real gap in water resistance: the EarFun Uboom Slim at IPX7 (brief submersion) against the W-King T9, which has no water resistance.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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Specifications Side By Side
| EarFun Uboom Slim | W-King T9 | |
|---|---|---|
| Price | $79 Discontinued | $111.23 |
| Ranked | #43 of 179 in Medium Size Portable Bluetooth Speakers | #53 of 120 in Large Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | ~63Hz | 47Hz |
| Battery Life | 16 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Weight | 1.2 lbs (560 g) | 10.1 lbs (4.6 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Bluetooth Version | 5.2 | 5.3 |
| Built-in Microphone | Yes | Yes |
| Drivers | 45mm speaker drivers | 2x 4.04” subwoofers + drivers |
| Amplifier Power | 20W | 80W |
| IP Rating | IPX7 | None |
| Digital Aux Input | No | No |
| Dimensions | 2.6”H x 7.1”W x 2.6”D (65 x 180 x 65 mm) | 11.8” x 5.9” x 4.7” (300 x 150 x 120 mm) |
| App | No | No |
| Aux Input | Yes | Yes |
| EQ | No | No |
| TWS | Yes | Yes |
| Maximum SPL | - | 106dB (measured by Alan Ross Reviews) |
| MicroSD Playback | - | Yes |
| Power Bank | - | Yes (USB-A) |
| Party Mode | - | No |
| Lights | - | Yes |
| Strap | - | No |
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