Short answer: the Harman Kardon Onyx Studio 9. It ranks #15 of 113 boombox speakers by sound quality, rated 4.1/5, at $184.99. The Tronsmart Fiitune X30 ranks #54, rated 3.3/5, at $144.90, $40.09 cheaper, not enough of a saving to outweigh the sound-quality gap.
The Harman Kardon Onyx Studio 9 is the better-sounding choice. An elegant living room portable with balanced, smooth, non-fatiguing sound, app EQ, and stereo pairing for music lovers. The catch: It has no water resistance, aux input or USB playback, and its eight-hour claimed battery life is short for an outdoor portable.
The Tronsmart Fiitune X30 is the longer-running, tougher pick. A loud six driver speaker with LDAC Bluetooth, water resistance and a long rated battery. It is rated for 14 hours of battery against 8 for the Harman Kardon Onyx Studio 9. It is rated IPX6, while the Harman Kardon Onyx Studio 9 has no water resistance. It supports LDAC Bluetooth, which the Harman Kardon Onyx Studio 9 lacks. Watch for: Side by side it clearly lost to the Harman Kardon Go + Play 3, the Soundcore Boom 2 and the EarFun Uboom X: listeners described muddy, dark mid-bass that fails to reproduce low notes, dull and underemphasized treble, and a boxy, sterile sound at low volume next to the JBL Xtreme 4.
Buy the Harman Kardon Onyx Studio 9. It is rated higher for sound quality, and the $40.09 you would save on the Tronsmart Fiitune X30 does not close the gap.
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Prices on this page were last checked November 14, 2026 at 6:17 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
| Harman Kardon Onyx Studio 9 | Tronsmart Fiitune X30 | |
|---|---|---|
| Price | $184.99 | $144.90 |
| Ranked | #15 of 113 in Boombox Size Portable Bluetooth Speakers | #54 of 113 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 41Hz | - |
| Maximum SPL | 101dB (measured by Alan Ross Reviews) | - |
| IP Rating | None | IPX6 |
| Power Input | AC Power Cable (2-Prong) | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 9.3 lbs (4.2 kg) | 7.9 lbs (3.6 kg) |
| App | Yes (Harman Kardon One app) | Yes (Tronsmart) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, LDAC |
| EQ | Yes (App EQ) | Yes |
| Party Mode | Yes (Auracast) | - |
| USB Playback | No | - |
| Bluetooth Version | 5.3 | 5.3 |
| Battery Life | 8 hours (Manufacturer specified) | 14 hours (Manufacturer specified) |
| Amplifier Power | 50W RMS | 80W |
| Dimensions | 11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm) | 14.6” x 7.7” x 5.1” (370 x 195 x 130 mm) |
| Drivers | 120mm woofer + 3x 20mm tweeters | Racetrack woofer + 2x midrange + 2x tweeters + upward-firing driver |
| Digital Aux Input | No | - |
| Aux Input | No | Yes |
| Strap | No | No |
Where the Ratings Come From
- Harman Kardon Onyx Studio 9: reviews by Alan Ross.
- Tronsmart Fiitune X30: reviews by Dominik, Jagist and Storytripper HD.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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