Zealot ZE51 vs EarFun Uboom X

Last updated: October 12, 2026

Short answer: the Zealot ZE51, if you are buying new. The EarFun Uboom X ranks higher than it (#1 vs #16 of 98 boombox speakers, 4.7/5 vs 4.1/5) but is discontinued, so only consider it used; the Zealot ZE51 is still sold new at $296.39.

Zealot ZE51 vs EarFun Uboom X

Buy the Zealot ZE51 new; the EarFun Uboom X is no longer sold new, so it only makes sense as a used find.

Still deciding? The full Portable Bluetooth rankings cover every ranked option.

Check Zealot ZE51 price at Amazon ($296.39) →

Specifications Side By Side

Zealot ZE51 EarFun Uboom X
Price$296.39 after coupon$159.99 Discontinued
Ranked#16 of 98 in Boombox Size Portable Bluetooth Speakers#1 of 98 in Boombox Size Portable Bluetooth Speakers
AppYesYes (Earfun Audio app)
Aux InputYesYes
Battery Capacity48000mAh (12x4000mAh)-
BluetoothYesYes
Bluetooth Version5.35.3
Dimensions22.1” x 9.4” x 13” (562 x 238 x 331 mm)15.7” x 5.9” x 8.5” (400 x 150 x 215 mm)
EQYes (Hi-Res, 3D Surround, Extra Bass, Vocal and other sound modes)Yes (App EQ)
Frequency Response20Hz - 20kHz (Manufacturer specified)-
IP RatingIPX5IP67
Microphone InputYes (Karaoke mode)-
MicroSD PlaybackYes-
Amplifier Power250W80W
Power BankYes (USB-A + USB-C)Yes (USB-C)
Power InputType-CUSB-C
StereoYesYes
OmnidirectionalNoNo
TWSYesYes
USB PlaybackYesNo
Weight26 lbs (11.81 kg)9 lbs (4.1 kg)
Digital Aux InputNoNo
Bluetooth CodecsSBC (inferred; additional codecs unverified)AAC, SBC
Drivers1x 133mm + 2x 93mm + 2x 45mm2x 102mm (4”) woofers + 2x 20mm tweeters
Battery Life4 hours (Manufacturer specified)30 hours (Manufacturer specified)
StrapYes (strap)-
Aux Latency-16ms
Bass Extension (-10dB)-~38Hz
Built-in Microphone-Yes
Bluetooth Latency-SBC Video mode 48ms, AAC Video mode 128ms, SBC 112ms, AAC 176ms
Maximum SPL-110dB (measured by Alan Ross Reviews)
Party Mode-Yes (Party Connect mode, up to 50 speakers)
FM Tuner-No
Lights-Yes
Check Zealot ZE51 price at Amazon ($296.39) →

How EarFun Uboom X compares with other leading options:

Prices on this page were last checked October 13, 2026 at 3:17 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 $296.39 AliExpress $235.33 eBay

Zealot ZE51 ranking card

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 →

ReleasedMar 2026 (7 months ago)
Amplifier Power250W
AppYes
Aux InputYes
Battery Capacity48000mAh (12x4000mAh)
Battery Life4 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsSBC (inferred; additional codecs unverified)
Bluetooth Version5.3
Digital Aux InputNo
Dimensions22.1” x 9.4” x 13” (562 x 238 x 331 mm)
Drivers1x 133mm + 2x 93mm + 2x 45mm
EQYes (Hi-Res, 3D Surround, Extra Bass, Vocal and other sound modes)
Frequency Response20Hz - 20kHz (Manufacturer specified)
IP RatingIPX5
MicroSD PlaybackYes
Microphone InputYes (Karaoke mode)
OmnidirectionalNo
Power BankYes (USB-A + USB-C)
Power InputType-C
StereoYes
StrapYes (strap)
TWSYes
USB PlaybackYes
Weight26 lbs (11.81 kg)
Check current price at Amazon ($296.39) →Check current price at AliExpress ($235.33) →Search eBay for Zealot ZE51 →

EarFun Uboom X: $159.99 Discontinued eBay

EarFun Uboom X ranking card

Pros: Tuned by Oluv and he knocked it out of the park again. Deeper bass than the Tribit Stormbox Blast. Extremely neutral, possibly the best of any modern Bluetooth speaker slightly behind the Vifa Helsinki. This is the only speaker that sounds correct at every single volume level due to Oluv’s individual EQ settings at each volume level. Other speakers will need a different EQ at each volume level. Amazing sounding at low levels as it boosts bass and treble at low levels to account for the equal-loudness contour. Just considering the midrange and treble, this speaker is better sounding than the EarFun Uboom L. Measured bass extension of ~38Hz (-10dB).

Cons: The out of the box 0.33 firmware and EQ sounds horrible. Some users have reported sound interruption issues when running two in TWS, though not on every source device, and disabling AAC resolves it where it occurs. Discontinued.

Setup: Please update it using the Earfun app (Android or iOS) and select an Oluv EQ. The Earfun app has sound profiles created by Oluv for Studio, Indoor, Indoor+, Outdoor, Outdoor+, BOOM xxX, and Ground 0 which are all fantastic. Oluv has a newer firmware pack that brings it up a few more notches of neutral

Full EarFun Uboom X review and specifications →

ReleasedMar 2024 (2 years ago)
Amplifier Power80W
AppYes (Earfun Audio app)
Aux InputYes
Aux Latency16ms
Bass Extension (-10dB)~38Hz
Battery Life30 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsAAC, SBC
Bluetooth LatencySBC Video mode 48ms, AAC Video mode 128ms, SBC 112ms, AAC 176ms
Bluetooth Version5.3
Built-in MicrophoneYes
Digital Aux InputNo
Dimensions15.7” x 5.9” x 8.5” (400 x 150 x 215 mm)
Drivers2x 102mm (4”) woofers + 2x 20mm tweeters
EQYes (App EQ)
FM TunerNo
IP RatingIP67
LightsYes
Maximum SPL110dB (measured by Alan Ross Reviews)
OmnidirectionalNo
Party ModeYes (Party Connect mode, up to 50 speakers)
Power BankYes (USB-C)
Power InputUSB-C
StereoYes
TWSYes
USB PlaybackNo
Weight9 lbs (4.1 kg)
Search eBay for EarFun Uboom X →