Short answer: the Zealot PT21 for output and bass, the Sony SRS-XP500 for balance. The XP500’s 20W 3-way system with dual passive radiators is well balanced with clear highs and punchy bass, but it is not as loud or as deep in the bass as a Partybox 100 or 110. The PT21’s dual 166mm woofers and 200W output are the stronger party pick, and it costs $225.86 against $549.99.
Buy the Zealot PT21. It is rated higher for sound quality and still sold new, while the Sony SRS-XP500 is discontinued.
Battery life favors the Zealot PT21: rated for 60 hours against 20 hours for the Sony SRS-XP500.
If water resistance matters to you, the Zealot PT21 at IPX5 (water jets) holds up far better than the Sony SRS-XP500 at no water resistance.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Zealot PT21 | Sony SRS-XP500 | |
|---|---|---|
| Price | $225.86 | $549.99 Discontinued |
| Ranked | #12 of 43 in Party Size Portable Bluetooth Speakers | #14 of 43 in Party Size Portable Bluetooth Speakers |
| App | No | Yes |
| Aux Input | Yes | Yes |
| Battery Capacity | 48000mAh (12x4000mAh) | - |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.0 |
| Dimensions | 21.1” x 8.6” x 11.9” (535 x 219 x 303 mm) | 10.8” x 22.5” x 11.6” (275 x 572 x 295 mm) |
| Drivers | 2x 166mm woofers + tweeters + midrange drivers | 2x 140mm woofers + 2x 50mm tweeters |
| EQ | Yes (Bass, Voice, Standard modes) | Yes |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | - |
| IP Rating | IPX5 | None |
| Microphone Input | Yes (Karaoke mode with echo effect) | Yes (Karaoke mode with echo effect) |
| MicroSD Playback | Yes | - |
| Amplifier Power | 200W | - |
| Party Mode | Yes (PartyAdd up to 100 speakers) | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-A) | Yes (USB-A) |
| Power Input | Type-C | AC Power cord |
| Stereo | Yes | Partially |
| Omnidirectional | No | No |
| TWS | Yes | No |
| USB Playback | Yes | Yes |
| Weight | 20.7 lbs (9.4 kg) | 24.7 lbs (11.2 kg) |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) | LDAC, AAC, SBC |
| Lights | Yes | Yes |
| Battery Life | 60 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Bass Extension (-10dB) | - | 42Hz |
| Charging Time | - | 3 hours |
| Guitar Input | - | Yes |
| Strap | - | No |
Related Speaker Comparisons
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- JBL Partybox 310 vs Zealot PT21
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Prices on this page were last checked October 2, 2026 at 10:18 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 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) |
| 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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- Head-to-Head Comparisons
Sony SRS-XP500: $549.99 Discontinued Amazon eBay
Newer model: the Sony SRS-XV500, ranked lower, rated 4/5.
Pros: 20W 3-way speaker system with dual passive radiators, well-balanced sound (clear highs, detailed mids, punchy bass). 20-hour battery life, immersive room-filling sound. Party Connect feature links multiple compatible Sony speakers. USB charging port for device charging on-the-go. Built-in handle and IPX4 water resistance. Microphone input and karaoke support. Measured bass extension of 42Hz (-10dB).
Cons: Not as loud and bass not as deep as a JBL Partybox 100 or JBL Partybox 110. Discontinued.
Full Sony SRS-XP500 review and specifications →
| App | Yes |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | 42Hz |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | LDAC, AAC, SBC |
| Bluetooth Version | 5.0 |
| Charging Time | 3 hours |
| Digital Aux Input | No |
| Dimensions | 10.8” x 22.5” x 11.6” (275 x 572 x 295 mm) |
| Drivers | 2x 140mm woofers + 2x 50mm tweeters |
| EQ | Yes |
| Guitar Input | Yes |
| IP Rating | None |
| Lights | Yes |
| Microphone Input | Yes (Karaoke mode with echo effect) |
| Omnidirectional | No |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-A) |
| Power Input | AC Power cord |
| Stereo | Partially |
| Strap | No |
| TWS | No |
| USB Playback | Yes |
| Weight | 24.7 lbs (11.2 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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