Short answer: the Zealot ZE51 if sound quality matters most, the Zealot S78 if price matters most. The Zealot ZE51 ranks #14 of 74 boombox speakers at $296.39. The Zealot S78 ranks #74 at $159.68, $136.71 cheaper.
What the Zealot ZE51 offers: Cleaner sound and a wider stereo soundstage than the Zealot ZE41, with less distortion at high volume for better instrumental detail and clarity. Watch for: The Zealot ZE41 still wins on raw bass depth and price. Large and heavy like the rest of the boombox class, and clarity still isn’t up to dedicated hi-fi speakers.
The case for the Zealot S78: 120W RMS output with 150W peak power, exceptional 40-hour battery life, power bank function, IP67 waterproof, EQ with multiple modes, dual woofers with tweeters and passive radiators, MicroSD and USB playback, AUX input, TWS stereo pairing, USB-C charging The catch: Gets distorted above 50%. Not much bass. Volume level fluctuates at high volume.
Buy the Zealot ZE51 if sound quality matters more than the price. Buy the Zealot S78 if the price matters more than sound quality.
If sound quality matters at all to you, skip the Zealot S78. It ranks near the bottom of the 74 boombox speakers, so look higher up the list instead.
Specifications Side By Side
| Zealot ZE51 | Zealot S78 | |
|---|---|---|
| Price | $296.39 after coupon | $159.68 |
| Ranked | #14 of 74 in Boombox Size Portable Bluetooth Speakers | #74 of 74 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | Yes | Yes |
| Battery Capacity | 48000mAh (12x4000mAh) | - |
| Bluetooth Version | 5.3 | - |
| Dimensions | 22.1" x 9.4" x 13" (562 x 238 x 331 mm) | 16.1" x 6.6" x 7.3" (410 x 167 x 185 mm) |
| EQ | Yes (Hi-Res, 3D Surround, Extra Bass, Vocal and other sound modes) | Yes (multiple modes) |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | - |
| IP Rating | IPX5 | IP67 |
| Microphone Input | Yes (Karaoke mode) | - |
| MicroSD Playback | Yes | Yes |
| Output Power | 250W | 120W RMS / 150W peak |
| Power Bank | Yes (USB-A + USB-C) | Yes (USB-A) |
| Power Input | Type-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | Yes |
| Weight | 26 lbs / 11.81 kg | 9.7 lbs / 4.4 kg |
| Digital Aux Input | No | No |
| Battery Life | - | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | - | SBC |
| Party Mode | - | No |
| Built in Microphone | - | No |
| Drivers | - | 2x ~120mm (4.72") woofers + 2x ~42mm tweeters + 2x passive radiators |
Related Speaker Comparisons
More useful head-to-heads from the same speaker class:
- Harman Kardon Onyx Studio 9 vs Tribit Stormbox Blast 2
- Sony SRS-XG300 vs Zealot ZE41
- Tribit Stormbox Blast vs Zealot ZE41
- Zealot ZE51 vs Zealot S95
- Harman Kardon Onyx Studio 7 vs Zealot S78
Prices on this page were last checked August 29, 2026 at 8:52 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
Zealot ZE51: $296.39 after coupon Amazon Aliexpress eBay
Pros: Cleaner sound and a wider stereo soundstage than the Zealot ZE41, with less distortion at high volume for better instrumental detail and clarity.
Cons: The Zealot ZE41 still wins on raw bass depth and price. Large and heavy like the rest of the boombox class, and clarity still isn’t up to dedicated hi-fi speakers.
Full Zealot ZE51 review and specifications →
| App | Yes |
|---|---|
| Aux Input | Yes |
| Battery Capacity | 48000mAh (12x4000mAh) |
| Bluetooth Version | 5.3 |
| Digital Aux Input | No |
| Dimensions | 22.1" x 9.4" x 13" (562 x 238 x 331 mm) |
| EQ | Yes (Hi-Res, 3D Surround, Extra Bass, Vocal and other sound modes) |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX5 |
| MicroSD Playback | Yes |
| Microphone Input | Yes (Karaoke mode) |
| Omnidirectional | No |
| Output Power | 250W |
| Power Bank | Yes (USB-A + USB-C) |
| Power Input | Type-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 26 lbs / 11.81 kg |
- Links
- Reviews, Comparisons and Sound Samples
- J_Strat Battles: ZEALOT ZE51 VS JBL BOOMBOX 4 (OLD FIRMWARE VERSION) 🧨🧨🧨
- J_Strat Battles: Zealot ZE51 VS ZE21
- J_Strat Battles: ZEALOT ZE51 VS W-KING X20 🥳🥳
- J_Strat Battles: Zealot ZE51 vs ZE21 bass boost/vocal eq battle 💪🏻😎
- J_Strat Battles: Zealot ZE51 short hz test video
- Reddit Search for Zealot ZE51 Review
- Head-to-Head Comparisons
Zealot S78: $159.68 Amazon Aliexpress eBay
Pros: 120W RMS output with 150W peak power, exceptional 40-hour battery life, power bank function, IP67 waterproof, EQ with multiple modes, dual woofers with tweeters and passive radiators, MicroSD and USB playback, AUX input, TWS stereo pairing, USB-C charging
Cons: Gets distorted above 50%. Not much bass. Volume level fluctuates at high volume.
Full Zealot S78 review and specifications →
| App | No |
|---|---|
| Aux Input | Yes |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 16.1" x 6.6" x 7.3" (410 x 167 x 185 mm) |
| Drivers | 2x ~120mm (4.72") woofers + 2x ~42mm tweeters + 2x passive radiators |
| EQ | Yes (multiple modes) |
| IP Rating | IP67 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Output Power | 120W RMS / 150W peak |
| Party Mode | No |
| Power Bank | Yes (USB-A) |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 9.7 lbs / 4.4 kg |
- Reviews, Comparisons and Sound Samples
- Jay’s Straight Up Reviews & More: W-King X20 vs Zealot S78 Bluetooth Boombox Battle Outdoor Tailgater Special 🚗 Let the Whoopin’ Begin More from JaysStraightUpReviews →
- Jay’s Straight Up Reviews & More: DBSOARS F29 Max vs Zealot S78 🛜 (5B) Budget Bluetooth Boombox Basement Battle 🔊 Bass Modes Enabled
- Reddit Search for Zealot S78 Review
- Head-to-Head Comparisons