Short answer: the Zealot PT21. It ranks #12 of 46 party speakers by sound quality (rated 4.1/5) at $225.86 and is still sold new; the Sony GTK-XB72 ranks #43 (rated 2.2/5) and is discontinued, so it is only an option used.
The Zealot PT21 is the better-sounding, longer-running option. Dual 166mm woofers and 200W output in a lighter, more compact body than the Zealot ZE41, with a bundled wireless microphone and echo effect built in for karaoke. It is rated for 60 hours of battery against 23 for the Sony GTK-XB72. At 20.7 lbs (9.4 kg) it weighs noticeably less than the Sony GTK-XB72 at 26.9 lbs (12.2 kg). It is rated IPX5, while the Sony GTK-XB72 has no water resistance. Watch for: Unlike some other Zealot models, app-based EQ customization doesn’t appear to be fully supported yet, and IPX5 means it can handle splashes but not submersion.
Why pick the Sony GTK-XB72: Exceptional sound quality, powerful bass, vibrant multi-colored LED lights. The catch: No deep bass at all, weird midrange peak, rolled off treble and overall strange tuning.
Buy the Zealot PT21. It is rated higher for sound quality; the Sony GTK-XB72 is no longer sold new.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Zealot PT21 | Sony GTK-XB72 | |
|---|---|---|
| Price | $225.86 | $349 Discontinued |
| Ranked | #12 of 46 in Party Size Portable Bluetooth Speakers | #43 of 46 in Party Size Portable Bluetooth Speakers |
| App | No | No |
| Aux Input | Yes | Yes |
| Battery Capacity | 48000mAh (12x4000mAh) | - |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 4.2 |
| Dimensions | 21.1” x 8.6” x 11.9” (535 x 219 x 303 mm) | 13.6” x 25.8” x 14.9” (345 x 656 x 379 mm) |
| Drivers | 2x 166mm woofers + tweeters + midrange drivers | 10cm driver + passive radiators |
| EQ | Yes (Bass, Voice, Standard modes) | No |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | - |
| IP Rating | IPX5 | None |
| Microphone Input | Yes (Karaoke mode with echo effect) | - |
| MicroSD Playback | Yes | - |
| Amplifier Power | 200W | - |
| Party Mode | Yes (PartyAdd up to 100 speakers) | Yes (Partychain up to 100 speakers) |
| Power Bank | Yes (USB-A) | Yes (USB-A) |
| Power Input | Type-C | AC Power cord |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | No |
| USB Playback | Yes | Yes |
| Weight | 20.7 lbs (9.4 kg) | 26.9 lbs (12.2 kg) |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) | SBC, AAC, LDAC |
| Lights | Yes | Yes |
| Battery Life | 60 hours (Manufacturer specified) | 23 hours (Manufacturer specified) |
| Bass Extension (-10dB) | - | ~56Hz |
| FM Tuner | - | Yes |
| Strap | - | No |
Related Speaker Comparisons
How Zealot PT21 compares with other leading options:
- Sony ULT Tower 7 vs Zealot PT21
- Zealot PT21 vs JBL Partybox 330
- JBL Partybox Stage 320 vs Zealot PT21
- JBL Partybox 310 vs Zealot PT21
- Sony ULT Tower 5 vs Zealot PT21
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
Zealot PT21: $225.86 AliExpress $225.86 eBay
Pros: Dual 166mm woofers and 200W output in a lighter, more compact body than the Zealot ZE41, with a bundled wireless microphone and echo effect built in for karaoke. Quite deep bass for the price, even deeper than the JBL Boombox 4 in direct comparisons.
Cons: Unlike some other Zealot models, app-based EQ customization doesn’t appear to be fully supported yet, and IPX5 means it can handle splashes but not submersion.
Full Zealot PT21 review and specifications →
| Released | Nov 2025 (11 months ago) |
|---|---|
| Amplifier Power | 200W |
| App | No |
| Aux Input | Yes |
| Battery Capacity | 48000mAh (12x4000mAh) |
| Battery Life | 60 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 5.3 |
| Digital Aux Input | No |
| Dimensions | 21.1” x 8.6” x 11.9” (535 x 219 x 303 mm) |
| Drivers | 2x 166mm woofers + tweeters + midrange drivers |
| EQ | Yes (Bass, Voice, Standard modes) |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX5 |
| Lights | Yes |
| MicroSD Playback | Yes |
| Microphone Input | Yes (Karaoke mode with echo effect) |
| Omnidirectional | No |
| Party Mode | Yes (PartyAdd up to 100 speakers) |
| Power Bank | Yes (USB-A) |
| Power Input | Type-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 20.7 lbs (9.4 kg) |
- Links
- Reviews, Comparisons and Sound Samples
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- Jagist reviews: Zealot PT21 Unboxing And Review!!! 😈😈😈 More from Jagistreviews →
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- Head-to-Head Comparisons
Sony GTK-XB72: $349 Discontinued eBay
Newer model: the Sony SRS-XP700, ranked higher, rated 4/5, released Apr 2021 (also discontinued). It adds app control and adjustable EQ.
Older model: the Sony GTK-XB90 (ranked higher, rated 2.3/5). See every Sony GTK, XP and XV generation.
Pros: Exceptional sound quality, powerful bass, vibrant multi-colored LED lights. ClearAudio+ and Extra Bass technology for dynamic sound. LIVE SOUND button with angled speakers and DSP for 3D sound experience. FM radio, USB, RCA inputs with Music Center app control for lighting effects and EQ. Easy to use with convenient Bluetooth and FM radio. Measured bass extension of ~56Hz (-10dB).
Cons: No deep bass at all, weird midrange peak, rolled off treble and overall strange tuning. Discontinued.
Full Sony GTK-XB72 review and specifications →
| Released | Mar 2019 (7 years ago) |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~56Hz |
| Battery Life | 23 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 4.2 |
| Digital Aux Input | No |
| Dimensions | 13.6” x 25.8” x 14.9” (345 x 656 x 379 mm) |
| Drivers | 10cm driver + passive radiators |
| EQ | No |
| FM Tuner | Yes |
| IP Rating | None |
| Lights | Yes |
| Omnidirectional | No |
| Party Mode | Yes (Partychain up to 100 speakers) |
| Power Bank | Yes (USB-A) |
| Power Input | AC Power cord |
| Stereo | Yes |
| Strap | No |
| TWS | No |
| USB Playback | Yes |
| Weight | 26.9 lbs (12.2 kg) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons