Short answer: the Sony ULT Field 5 on measured sound quality, the W-King D9 on price. The Sony ULT Field 5 ranks #55 of 105 large speakers, rated 3.5/5, at $348. The W-King D9 ranks #91, rated 2.5/5, at $71.24, $276.76 cheaper.
The Sony ULT Field 5 is the better-sounding choice. A tough 7.3 lbs (3.3 kg) portable with IP67 protection, LDAC/AAC support, aux input, a 10-band app EQ, Party Connect, USB-C power-bank output and a claimed 25-hour battery. It supports LDAC Bluetooth, which the W-King D9 lacks. It links with other speakers (Party Connect up to 100 speakers), which the W-King D9 cannot. It has an adjustable EQ, which the W-King D9 lacks. The tradeoff: It prioritizes bass and loudness over fidelity: reviews find the upper mids and highs subdued, with limited stereo separation and soundstage depth.
The W-King D9 is the longer-running, lighter option. A compact 4.4 lbs (2 kg) boombox with 60W RMS output, a claimed 106dB maximum level, a measured 47Hz -10dB bass point, IPX6 protection, power-bank output, USB-C charging, aux and microSD playback. It is rated for 40 hours of battery against 25 for the Sony ULT Field 5. At 4.4 lbs (2 kg) it weighs much less than the Sony ULT Field 5 at 7.3 lbs (3.3 kg). The catch: Treble rolls off early, limiting air and fine detail, while owner reports note Bluetooth interference and some noise at maximum speaker volume.
Buy the Sony ULT Field 5 if sound quality matters more than the price. Buy the W-King D9 if the price matters more than sound quality.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Sony ULT Field 5 | W-King D9 | |
|---|---|---|
| Price | $348.00 | $71.24 |
| Ranked | #55 of 105 in Large Size Portable Bluetooth Speakers | #91 of 105 in Large Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | Yes | Yes |
| Battery Life | 25 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC |
| Bluetooth Version | 5.3 | 5.3 |
| Built-in Microphone | Yes | Yes |
| Dimensions | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) | 4.7” x 12.4” x 4.7” (120 x 315 x 120 mm) |
| Drivers | 2x 46mm tweeters + 1x 79mm x 107mm woofer | 2x 40mm drivers + passive radiators |
| EQ | Yes (App + ULT button) | No |
| IP Rating | IP67 | IPX6 |
| Party Mode | Yes (Party Connect up to 100 speakers) | No |
| Power Bank | Yes (USB-C) | Yes (USB-A) |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | No |
| Weight | 7.3 lbs (3.3 kg) | 4.4 lbs (2.0 kg) |
| Amplifier Power | 27W | 60W RMS |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | No |
| Bass Extension (-10dB) | - | 47Hz |
| Maximum SPL | - | 106dB (measured by Alan Ross Reviews) |
| MicroSD Playback | - | Yes |
| Frequency Response | - | 80Hz - 16kHz (Manufacturer specified) |
Related Speaker Comparisons
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- JBL Xtreme 5 vs Sony ULT Field 5
- Tribit Stormbox Lava vs Sony ULT Field 5
- Sony ULT Field 5 vs Brane X
- Minirig 4 with subwoofer vs Sony ULT Field 5
Prices on this page were last checked October 12, 2026 at 4:13 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
Sony ULT Field 5: $348.00 Amazon $348.00 Sony $349.99 eBay
Older models: the Sony SRS-XB43 (ranked lower, rated 3.5/5) and the Sony SRS-XG300 (ranked lower, rated 3.1/5). See every Sony XB and ULT generation.
Same family: the Sony ULT Field 1 (smaller model, rated 3.1/5), the Sony ULT Field 7 (smaller model, rated 3.2/5), the Sony ULT Tower 10 (smaller model, rated 3.9/5), the Sony ULT Field 3 (smaller model, rated 3.4/5), the Sony ULT Tower 5 (larger model, rated 4.5/5), the Sony ULT Tower 7 (larger model, rated 4.7/5), the Sony ULT Tower 9 (larger model, rated 4.2/5) and the Sony ULT Tower Max (larger model, rated 4.8/5).
Pros: A tough 3.3kg portable with IP67 protection, LDAC/AAC support, aux input, a 10-band app EQ, Party Connect, USB-C power-bank output and a claimed 25-hour battery. Reviews find it energetic and dynamic with substantial bass, enough volume for a yard, and two ULT modes that let bass-focused listeners choose a deeper or punchier presentation.
Cons: It prioritizes bass and loudness over fidelity: reviews find the upper mids and highs subdued, with limited stereo separation and soundstage depth. Deep bass is less authoritative than the enclosure suggests, and the loud confirmation tone when pressing the ULT button is an unnecessary annoyance. Use the app EQ and audition it before buying for detail-focused music.
Full Sony ULT Field 5 review and specifications →
| Released | Apr 2025 (1 year ago) |
|---|---|
| Amplifier Power | 27W |
| App | Yes |
| Aux Input | Yes |
| Battery Life | 25 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) |
| Drivers | 2x 46mm tweeters + 1x 79mm x 107mm woofer |
| EQ | Yes (App + ULT button) |
| IP Rating | IP67 |
| Omnidirectional | No |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-C) |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| Weight | 7.3 lbs (3.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Joy & Oluv’Sone: Sony ULT Field 5 vs Anker SoundCore Boom 2 - listening test More from Oluv’Sone →
- Dominik Reviews: Sony ULT Field 5 vs JBL Xtreme 4 - Outdoor Sound Test - Sony shines or not? More from Dominik Reviews →
- Mateusz Cholewa: SONY ULT Field 5 vs BOGASING S8 PRO MAX More from Mateusz Cholewa →
- Mateusz Cholewa: MARSHALL Kilburn 3 vs SONY ULT Field 5
- Danny Pops: Don’t TOUCH that ULT Button! Sony ULT Field 5 Review More from DannyPops →
- Mark Ellis Reviews: Sony just changed summer sound 🤨 | Sony ULT Field 5 & 3 Review
- Head-to-Head Comparisons
W-King D9: $71.24 Amazon $71.24 eBay
Pros: A compact 2kg boombox with 60W RMS output, a claimed 106dB maximum level, a measured 47Hz -10dB bass point, IPX6 protection, power-bank output, USB-C charging, aux and microSD playback. Long-term owners praise its loud, punchy character and useful indoor/outdoor voicing for casual outdoor listening. Measured bass extension of 47Hz (-10dB).
Cons: Treble rolls off early, limiting air and fine detail, while owner reports note Bluetooth interference and some noise at maximum speaker volume. There is no app or adjustable EQ, and its bass does not reach as deep as larger rivals, so it is better suited to energetic background music than neutral listening.
Full W-King D9 review and specifications →
| Released | Dec 2020 (5 years ago) |
|---|---|
| Amplifier Power | 60W RMS |
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 47Hz |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 4.7” x 12.4” x 4.7” (120 x 315 x 120 mm) |
| Drivers | 2x 40mm drivers + passive radiators |
| EQ | No |
| Frequency Response | 80Hz - 16kHz (Manufacturer specified) |
| IP Rating | IPX6 |
| 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 |
| Strap | No |
| TWS | No |
| Weight | 4.4 lbs (2.0 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons