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 $130, 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.
What the Earfun Uboom Slim gets right: Excellent pricing, strong waterproof build (IPX7), good battery life (16 hours), smooth sound with volume compensation. Set against that: Not as deep bass as others.
On the W-King T9 side: 80W output power, 106dB max volume, 24-hour battery life, power bank function, Bluetooth 5.3 with 100ft range. The catch: Peaks in the upper mids which makes it sound a bit harsh.
Buy the Earfun Uboom Slim ($79) for a medium speaker; the W-King T9 ($130) 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.
Specifications Side By Side
| Earfun Uboom Slim | W-King T9 | |
|---|---|---|
| Price | $79 | $78.83 |
| Ranked | #40 of 142 in Medium Size Portable Bluetooth Speakers | #38 of 78 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 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 |
Related Speaker Comparisons
How Earfun Uboom Slim compares with other leading options:
- Soundcore Motion 300 vs Earfun Uboom Slim
- JBL Charge 6 vs Earfun Uboom Slim
- JBL Flip 7 vs Earfun Uboom Slim
- Bose Soundlink Revolve+ II vs Earfun Uboom Slim
- Soundcore Motion 300 vs W-King T9
Prices on this page were last checked September 23, 2026 at 11:24 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
Earfun Uboom Slim: $79 eBay
Pros: Excellent pricing, strong waterproof build (IPX7), good battery life (16 hours), smooth sound with volume compensation, speakerphone capability. Measured bass extension of ~63Hz (-10dB).
Cons: Not as deep bass as others. Warm tuned, peaks in the mids and lower treble, rolled off upper treble
Full Earfun Uboom Slim review and specifications →
| Amplifier Power | 20W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~63Hz |
| Battery Life | 16 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 2.6"H x 7.1"W x 2.6"D (65 x 180 x 65 mm) |
| Drivers | 45mm speaker drivers |
| EQ | No |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.2 lbs (560 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
W-King T9: $78.83 Amazon Aliexpress eBay
Pros: 80W output power, 106dB max volume, 24-hour battery life, power bank function, Bluetooth 5.3 with 100ft range, TWS stereo pairing with wireless microphone, dual subwoofers, RGB lighting, MicroSD and AUX support, USB-C charging, karaoke capability. Measured bass extension of 47Hz (-10dB).
Cons: Peaks in the upper mids which makes it sound a bit harsh.
Full W-King T9 review and specifications →
| Amplifier Power | 80W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 47Hz |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 11.8" x 5.9" x 4.7" (300 x 150 x 120 mm) |
| Drivers | 2x 4.04" subwoofers + drivers |
| EQ | No |
| IP Rating | None |
| Lights | Yes |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A) |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 10.1 lbs (4.6 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: W-King t9 party speaker vs Soundcore Rave Neo and Trance (Rave Mega) 🥳 More from alanrossreviews →
- Alan Ross Reviews: W-King T9 or Soundcore Motion Boom - King vs World Champion! 👌
- Jay’s Straight Up Reviews & More: W-King T9 🆚 ONN Large Party Speaker -By Request for Big Tee. Can the Smaller T9 Hang With The ONN? More from JaysStraightUpReviews →
- Head-to-Head Comparisons