Short answer: the Sony ULT Tower 5 for better sound quality, the Zealot PT21 for the lower price. The Sony ULT Tower 5 ranks #5 of 39 party speakers at $448. The Zealot PT21 ranks #12 at $225.86, $222.14 cheaper.
What the Sony ULT Tower 5 offers: At $449.99, its 300W system with a 9-inch woofer delivers a notably capable party-speaker package: a removable 20-hour battery, IPX4 splash resistance, 10-band EQ and ULT1/ULT2 modes. AudioTribe’s first impressions praise its deeper bass and clearer sound than the JBL PartyBox Club 120; it also has USB-C and USB-A, RCA, balanced XLR and mic inputs for DJ and karaoke use. Watch for: It has a shorter 20-hour battery claim than the Tower 7’s 30 hours, no wheels, and only IPX4 splash resistance. Its single-woofer, two-tweeter layout lacks the Tower 7’s 360-degree rear-driver array, and the reviewer describes the sound assessment as first impressions rather than a controlled measurement comparison.
What the Zealot PT21 offers: Dual 166mm woofers and 200W output in a lighter, more compact body than the 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. 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.
Buy the Sony ULT Tower 5 when sound quality outweighs the price for you, and the Zealot PT21 when the price outweighs sound quality instead.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Sony ULT Tower 5 | Zealot PT21 | |
|---|---|---|
| Price | $448.00 | $216.73 |
| Ranked | #5 of 39 in Party Size Portable Bluetooth Speakers | #12 of 39 in Party Size Portable Bluetooth Speakers |
| App | Yes (Sony Sound Connect) | No |
| Aux Input | RCA input | Yes |
| Battery Life | 20 hours (manufacturer specified) | - |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 5.3 | 5.3 |
| Built-in Microphone | No | - |
| Digital Aux Input | Yes (USB-C) | No |
| Dimensions | 14.1" x 21.1" x 11.1" (358 x 536 x 282 mm) | 21.1" x 8.6" x 11.9" (535 x 219 x 303 mm) |
| Drivers | 3 drivers: 1x 9" woofer, 2x 2.4" tweeter | 2x 166mm woofers + tweeters + midrange drivers |
| EQ | Yes (10 band; ULT1 / ULT2 / Flat) | Yes (Bass, Voice, Standard modes) |
| Guitar Input | No | - |
| IP Rating | IPX4 | IPX5 |
| Microphone Input | Yes | Yes (Karaoke mode with echo effect) |
| Omnidirectional | No | No |
| Amplifier Power | 300W | 200W |
| Party Mode | Yes (Auracast) | Yes (PartyAdd up to 100 speakers) |
| Power Bank | Yes (USB-C charging) | Yes (USB-A) |
| Power Input | AC power cord | Type-C |
| Removable Battery | Yes | - |
| Stereo | Yes | Yes |
| TWS | Yes (Stereo Pair) | Yes |
| USB Playback | Yes (USB-A and USB-C) | Yes |
| Weight | 28 lbs (12.7 kg) | 20.7 lbs (9.4 kg) |
| Wi-Fi | No | - |
| Lights | Yes | Yes |
| Battery Capacity | - | 48000mAh (12x4000mAh) |
| Frequency Response | - | 20Hz - 20kHz (Manufacturer specified) |
| MicroSD Playback | - | Yes |
Related Speaker Comparisons
More top alternatives to Sony ULT Tower 5:
- Sony ULT Tower 5 vs Sony ULT Tower 7
- Sony ULT Tower 5 vs JBL Partybox 330
- Sony ULT Tower 5 vs JBL Partybox Stage 320
- Sony ULT Tower 5 vs JBL Partybox Club 120
- Sony ULT Tower 5 vs JBL Partybox 130
Prices on this page were last checked September 16, 2026 at 12:41 AM 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 Tower 5: $448.00 Amazon eBay
Pros: At $449.99, its 300W system with a 9-inch woofer delivers a notably capable party-speaker package: a removable 20-hour battery, IPX4 splash resistance, 10-band EQ and ULT1/ULT2 modes. AudioTribe’s first impressions praise its deeper bass and clearer sound than the JBL PartyBox Club 120; it also has USB-C and USB-A, RCA, balanced XLR and mic inputs for DJ and karaoke use.
Cons: It has a shorter 20-hour battery claim than the Tower 7’s 30 hours, no wheels, and only IPX4 splash resistance. Its single-woofer, two-tweeter layout lacks the Tower 7’s 360-degree rear-driver array, and the reviewer describes the sound assessment as first impressions rather than a controlled measurement comparison.
Full Sony ULT Tower 5 review and specifications →
| Amplifier Power | 300W |
|---|---|
| App | Yes (Sony Sound Connect) |
| Aux Input | RCA input |
| Battery Life | 20 hours (manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Digital Aux Input | Yes (USB-C) |
| Dimensions | 14.1" x 21.1" x 11.1" (358 x 536 x 282 mm) |
| Drivers | 3 drivers: 1x 9" woofer, 2x 2.4" tweeter |
| EQ | Yes (10 band; ULT1 / ULT2 / Flat) |
| Guitar Input | No |
| IP Rating | IPX4 |
| Lights | Yes |
| Microphone Input | Yes |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-C charging) |
| Power Input | AC power cord |
| Removable Battery | Yes |
| Stereo | Yes |
| TWS | Yes (Stereo Pair) |
| USB Playback | Yes (USB-A and USB-C) |
| Weight | 28 lbs (12.7 kg) |
| Wi-Fi | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Sony ULT Tower 5 vs JBL Partybox Club 120
- Sony ULT Tower 5 vs JBL Partybox 130
- Sony ULT Tower 5 vs JBL Partybox Stage 320
- Sony ULT Tower 5 vs JBL Partybox 330
- Sony ULT Tower 5 vs Sony ULT Tower 7
- Sony ULT Tower 5 vs JBL Partybox 110
- Sony ULT Tower 5 vs Onn XL Wireless Party Speaker
- Sony ULT Tower 5 vs Sony SRS-XP700
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Zealot PT21: $216.73 Aliexpress eBay
Pros: Dual 166mm woofers and 200W output in a lighter, more compact body than the 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 →
| Amplifier Power | 200W |
|---|---|
| App | No |
| Aux Input | Yes |
| Battery Capacity | 48000mAh (12x4000mAh) |
| 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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