Short answer: the Zealot ZE21 for better sound quality, the Onn Medium Party Speaker Gen 2 for the lower price. The Zealot ZE21 ranks #17 of 75 boombox speakers at $247.41. The Onn Medium Party Speaker Gen 2 ranks #45 at $90, $157.41 cheaper.
What the Zealot ZE21 offers: The ZE21’s main attraction is unusually deep bass for a battery boombox: owner testing finds real output in the 40-50Hz region and audibility down toward the low 30s. Its TWS button can form a stereo pair with another compatible Zealot, and its large, rugged chassis gives it credible party-speaker scale. Watch for: That deep-bass emphasis comes with a pronounced 60-110Hz kick-bass dip and over-loud 250-600Hz lower mids, which can make rock and pop sound hollow or boxy. The supplied sound modes do not fully correct the tuning; the most positive independent report required source-side parametric EQ. Treble is also soft and clarity trails better-tuned rivals.
What the Onn Medium Party Speaker Gen 2 offers: Under $100 with LED lights synced to music. Simple controls, solid Bluetooth range. Mic input for karaoke/emcee. Built-in FM radio with 16 presets. Aux port. Watch for: Lacking detail compared to the Onn Large Party Gen 2 and not as deep of bass. Only available in the United States and Canada.
Buy the Zealot ZE21 if sound quality is the priority over the price, or the Onn Medium Party Speaker Gen 2 if the price is the priority over sound quality.
If battery life is a priority, the Zealot ZE21 is rated for 40 hours versus 20 hours for the Onn Medium Party Speaker Gen 2.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Zealot ZE21 | Onn Medium Party Speaker Gen 2 | |
|---|---|---|
| Price | $187.15 | $90 |
| Ranked | #17 of 75 in Boombox Size Portable Bluetooth Speakers | #45 of 75 in Boombox Size Portable Bluetooth Speakers |
| App | No | No |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 36Hz | - |
| Battery Life | 40 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| EQ | Yes (multiple modes) | No |
| IP Rating | IPX6 | IPX7 |
| MicroSD Playback | Yes | - |
| Party Mode | Yes (PartyAdd up to 100 speakers) | Yes (Party Sync Mode) |
| Power Input | USB-C | AC Power cord |
| Stereo | Yes | No |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 20.4 lbs (9.27 kg) | 11 lbs (5 kg) |
| Bluetooth Codecs | SBC | SBC |
| Power Bank | Yes (USB-A + USB-C) | Yes (USB-A, 5V/2.1A) |
| USB Playback | Yes | No |
| Built-in Microphone | No | No |
| Amplifier Power | 250W | 50W RMS / 200W peak |
| Dimensions | 16.7" x 10.3" x 14.3" (424 x 262 x 363 mm) | 9.6" x 10.9" x 15.1" (244.1 x 277.9 x 383 mm) |
| Drivers | 130W subwoofer + 2x 50mm woofers + passive radiators | 8" (203mm) woofer + tweeters |
| Maximum SPL | 116dB (Manufacturer specified) | - |
| Digital Aux Input | No | No |
| FM Tuner | - | Yes (16 presets) |
| Microphone Input | - | Yes (Karaoke mode with echo effect) |
| Lights | - | Yes |
Related Speaker Comparisons
More worthwhile head-to-heads for Zealot ZE21:
- Tribit Stormbox Blast vs Zealot ZE21
- Harman Kardon Go + Play 3 vs Zealot ZE21
- JBL Partybox Encore 2 vs Zealot ZE21
- JBL Partybox Encore Essential 2 vs Zealot ZE21
- JBL Partybox Encore vs Zealot ZE21
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
Zealot ZE21: $187.15 Amazon Aliexpress eBay
Pros: The ZE21’s main attraction is unusually deep bass for a battery boombox: owner testing finds real output in the 40-50Hz region and audibility down toward the low 30s. Its TWS button can form a stereo pair with another compatible Zealot, and its large, rugged chassis gives it credible party-speaker scale. Measured bass extension of 36Hz (-10dB).
Cons: That deep-bass emphasis comes with a pronounced 60-110Hz kick-bass dip and over-loud 250-600Hz lower mids, which can make rock and pop sound hollow or boxy. The supplied sound modes do not fully correct the tuning; the most positive independent report required source-side parametric EQ. Treble is also soft and clarity trails better-tuned rivals.
Full Zealot ZE21 review and specifications →
| Amplifier Power | 250W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 36Hz |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 16.7" x 10.3" x 14.3" (424 x 262 x 363 mm) |
| Drivers | 130W subwoofer + 2x 50mm woofers + passive radiators |
| EQ | Yes (multiple modes) |
| IP Rating | IPX6 |
| Maximum SPL | 116dB (Manufacturer specified) |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | Yes (PartyAdd up to 100 speakers) |
| Power Bank | Yes (USB-A + USB-C) |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 20.4 lbs (9.27 kg) |
- Links
- Reviews, Comparisons and Sound Samples
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- Jay’s Straight Up Reviews & More: Zealot ZE21 vs JBL Boombox 3 Tailgater Special @20ft. The Budget Beast Against the OG Boombox More from JaysStraightUpReviews →
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Onn Medium Party Speaker Gen 2: $90 Walmart eBay
Pros: Under $100 with LED lights synced to music. Simple controls, solid Bluetooth range. Mic input for karaoke/emcee. Built-in FM radio with 16 presets. Aux port.
Cons: Lacking detail compared to the Onn Large Party Gen 2 and not as deep of bass. Only available in the United States and Canada.
Full Onn Medium Party Speaker Gen 2 review and specifications →
| Amplifier Power | 50W RMS / 200W peak |
|---|---|
| App | No |
| Aux Input | Yes |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 9.6" x 10.9" x 15.1" (244.1 x 277.9 x 383 mm) |
| Drivers | 8" (203mm) woofer + tweeters |
| EQ | No |
| FM Tuner | Yes (16 presets) |
| IP Rating | IPX7 |
| Lights | Yes |
| Microphone Input | Yes (Karaoke mode with echo effect) |
| Omnidirectional | No |
| Party Mode | Yes (Party Sync Mode) |
| Power Bank | Yes (USB-A, 5V/2.1A) |
| Power Input | AC Power cord |
| Stereo | No |
| TWS | Yes |
| USB Playback | No |
| Weight | 11 lbs (5 kg) |
- Reviews, Comparisons and Sound Samples
- Jay’s Straight Up Reviews & More: ONN Large Party Speaker Gen 2 vs Medium Party Speaker Gen 2 🤜🤛A Family Feud🔌Plugged In Bass Boost On More from JaysStraightUpReviews →
- Jay’s Straight Up Reviews & More: Skullcandy Barrel XT vs ONN Medium Party Speaker Gen. 2 😬(Both Bass Boost On🔉) The Price is Right?🤑
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