Short answer: both are discontinued, so this only matters if you are buying used, though neither ranks well in its class. Used, the Diamondboxx L2 is the better pick: it ranks #40 of 54 party speakers by sound quality (rated 2.9/5), against #49 (rated 2.3/5) for the Sony GTK-XB90. Both are rated below 3.0/5 among the 54 party speakers; for better sound, the Sony ULT Tower 7 ranks #1 at $648.
The Diamondboxx L2 is the better-sounding, longer-running choice. A heavy boombox style party speaker that fills large spaces, with a very long battery and USB charging for phones. It is rated for 48 hours of battery against 16 for the Sony GTK-XB90. At 24.3 lbs (11 kg) it weighs noticeably less than the Sony GTK-XB90 at 30.9 lbs (14 kg). The catch: Boomyness in the 100Hz region.
What the Sony GTK-XB90 does well: A big one box party speaker with beat synced lights, a built in handle, DJ effects, and three device Bluetooth pairing. It supports LDAC Bluetooth, which the Diamondboxx L2 lacks. It links with other speakers (Partychain up to 100 speakers), which the Diamondboxx L2 cannot. The tradeoff: Bass is muddy and not deep, weird midrange peak, rolled off treble and overall strange tuning.
Buy the Diamondboxx L2 only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, start with the Sony ULT Tower 7 instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
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
| Diamondboxx L2 | Sony GTK-XB90 | |
|---|---|---|
| Price | $1,000 Discontinued | $429 Discontinued |
| Ranked | #40 of 54 in Party Size Portable Bluetooth Speakers | #49 of 54 in Party Size Portable Bluetooth Speakers |
| App | No | No |
| Aux Input | Yes | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | aptX HD, SBC | SBC, AAC, LDAC |
| Bluetooth Version | 4.2 | - |
| Charging Time | 9 hours | - |
| Dimensions | 23” x 14.5” x 9.5” (584.2 x 368.3 x 241.3 mm) | 13.2” x 26.4” x 13.2” (336 x 670 x 335 mm) |
| Drivers | 5.5” woofer, 1” tweeter | 12cm drivers + passive radiators |
| EQ | No | No |
| Frequency Response | 40Hz - 22kHz (Manufacturer specified) | - |
| IP Rating | None | None |
| Party Mode | No | Yes (Partychain up to 100 speakers) |
| Power Bank | No | Yes (USB-A, 2.1A) |
| Power Input | AC Power brick | AC Power cord |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | No | No |
| USB Playback | No | No |
| Weight | 24.3 lbs (11 kg) | 30.9 lbs (14 kg) |
| Amplifier Power | 260W RMS | - |
| Digital Aux Input | No | No |
| Battery Life | 6-48 hours (Manufacturer specified) | 16 hours (Manufacturer specified) |
| Bass Extension (-10dB) | - | ~50Hz |
| Lights | - | Yes |
Where the Ratings Come From
- Diamondboxx L2: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
- Sony GTK-XB90: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
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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