Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The Sony ULT Field 7 ranks #61 of 113 boombox speakers by sound quality at $448; the W-King T9 Pro ranks #38 of 53 party speakers by sound quality at $171.49.
The Sony ULT Field 7 is the longer-running, lighter pick. A waterproof stereo party speaker with a 30 hour battery and karaoke mic and guitar inputs. It is rated for 30 hours of battery against 12 for the W-King T9 Pro. At 13.9 lbs (6.3 kg) it weighs noticeably less than the W-King T9 Pro at 20 lbs (9.05 kg). It is rated IP67, while the W-King T9 Pro has no water resistance. The tradeoff: A peak around 8kHz, and bass does not reach as deep as the top-ranked speakers.
What the W-King T9 Pro does well: A rolling party speaker with dual woofers, a removable battery for long events, stereo pairing, and music synced lights. The catch: Reviewer comparisons describe the tuning as warm and gritty rather than clean or detailed.
Buy the Sony ULT Field 7 ($448) for a boombox speaker; the W-King T9 Pro ($171.49) suits a party speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Prices on this page were last checked November 7, 2026 at 7:34 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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Specifications Side By Side
| Sony ULT Field 7 | W-King T9 Pro | |
|---|---|---|
| Price | $448.00 | $171.49 |
| Ranked | #61 of 113 in Boombox Size Portable Bluetooth Speakers | #38 of 53 in Party Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~52Hz | - |
| Battery Life | 30 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Guitar Input | Yes | - |
| IP Rating | IP67 | None |
| Microphone Input | Yes (Karaoke mode with echo effect) | - |
| Party Mode | Yes (Party Connect up to 100 speakers) | No |
| Power Bank | Yes (USB-A, 5V/1.5A) | No |
| Power Input | AC Power cord | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| USB Playback | Yes | Yes |
| Weight | 13.9 lbs (6.3 kg) | 20 lbs (9.05 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC |
| App | No | No |
| EQ | Yes (App + ULT button) | No |
| TWS | Yes | No |
| Built-in Microphone | Yes | - |
| Bluetooth Version | 5.2 | 5.3 |
| Dimensions | 20.2” x 8.8” x 8.7” (512 x 224 x 222 mm) | 10.8” x 10.1” x 21.1” (274 x 255.7 x 535.5 mm) |
| Amplifier Power | 100W | 250W (peak) |
| Drivers | 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9”) tweeters | 2x 6.5” woofers, 2x 2.5” tweeters |
| Digital Aux Input | No | No |
| Strap | No | - |
| Charging Time | - | 4 hours |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Lights | - | Yes |
| Wheels | - | Yes |
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