EarFun Uboom X vs Marshall Kilburn III

Last updated: October 10, 2026

Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The EarFun Uboom X ranks #1 of 91 boombox speakers by sound quality at $159.99; the Marshall Kilburn III ranks #42 of 103 large speakers by sound quality at $379.99.

EarFun Uboom X vs Marshall Kilburn III

The EarFun Uboom X is the deeper-bass, tougher option. Tuned by Oluv and he knocked it out of the park again. Its bass reaches about 38Hz before falling 10dB, against 45Hz for the Marshall Kilburn III. It is rated IP67 against IP54 for the Marshall Kilburn III. The catch: The out of the box 0.33 firmware and EQ sounds horrible.

The Marshall Kilburn III is the longer-running, lighter pick. Spacious soundstage with broad stereo dispersion from Marshall’s True Stereophonic multi-driver layout, delivering warm, room-filling sound with 45Hz bass extension. It is rated for 50 hours of battery against 30 for the EarFun Uboom X. At 6.3 lbs (2.85 kg) it weighs noticeably less than the EarFun Uboom X at 9 lbs (4.1 kg). The tradeoff: Noticeable dips in the midrange compromise frequency response neutrality, making vocals and acoustic instruments sound somewhat recessed or muffled compared to more linear competitors like the JBL Xtreme 4 unless the bass dial is dialed back.

One note: the EarFun Uboom X is no longer sold new, but at #1 of 91 boombox speakers by sound quality it still outranks most current models, so used is worth considering.

Buy the EarFun Uboom X at $159.99 for a boombox speaker, or the Marshall Kilburn III at $379.99 for a large speaker instead.

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

Check Marshall Kilburn III price at Amazon ($379.99) →

Specifications Side By Side

EarFun Uboom X Marshall Kilburn III
Price$159.99 Discontinued$379.99
Ranked#1 of 91 in Boombox Size Portable Bluetooth Speakers#42 of 103 in Large Size Portable Bluetooth Speakers
AppYes (Earfun Audio app)Yes
Aux InputYesYes
Aux Latency16ms-
Bass Extension (-10dB)~38Hz45Hz
Battery Life30 hours (Manufacturer specified)50 hours (Manufacturer specified)
BluetoothYesYes
Bluetooth CodecsAAC, SBCSBC, AAC
Built-in MicrophoneYesNo
EQYes (App EQ)Yes
IP RatingIP67IP54
Bluetooth LatencySBC Video mode 48ms, AAC Video mode 128ms, SBC 112ms, AAC 176ms-
Maximum SPL110dB (measured by Alan Ross Reviews)91dB
Party ModeYes (Party Connect mode, up to 50 speakers)Yes (Auracast)
Power BankYes (USB-C)Yes
Power InputUSB-CUSB-C
TWSYesYes
Weight9 lbs (4.1 kg)6.3 lbs (2.85 kg)
StereoYesYes
OmnidirectionalNoNo
USB PlaybackNo-
FM TunerNo-
Bluetooth Version5.35.3
Amplifier Power80W50W
Dimensions15.7” x 5.9” x 8.5” (400 x 150 x 215 mm)10.7” x 5.9” x 6.7” (272 x 150 x 170 mm)
Drivers2x 102mm (4”) woofers + 2x 20mm tweeters1x 4” woofer + 2x 2” full-range drivers
Digital Aux InputNoNo
LightsYes-
Frequency Response-45Hz - 20kHz
Strap-Yes (built-in strap)
Check Marshall Kilburn III price at Amazon ($379.99) →

Watch Them Compared

Videos and reviews that test both speakers side by side.

More worthwhile head-to-heads for EarFun Uboom X:

Prices on this page were last checked October 10, 2026 at 5:37 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

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 →

Marshall Kilburn III: $379.99 Amazon eBay

Marshall Kilburn III ranking card

Older model: the Marshall Kilburn II (ranked lower, rated 3.8/5). See every Marshall Portable Speakers generation.

Same family: the Marshall Willen II (smaller model, rated 4/5), the Marshall Emberton III (smaller model, rated 2.7/5), the Marshall Middleton II (smaller model, ranked higher, rated 4.1/5) and the Marshall Stockwell III (smaller model, ranked lower, rated 3/5).

Pros: Spacious soundstage with broad stereo dispersion from Marshall’s True Stereophonic multi-driver layout, delivering warm, room-filling sound with 45Hz bass extension. Independent physical bass and treble dials allow quick tonal adjustments on the fly, backed by app-based EQ and placement compensation. Battery life is outstanding at up to 50+ hours with USB-C power-bank charging, IP54 splash resistance, 3.5mm aux input, and Bluetooth 5.3 with Auracast broadcast support. Measured bass extension of 45Hz (-10dB).

Cons: Noticeable dips in the midrange compromise frequency response neutrality, making vocals and acoustic instruments sound somewhat recessed or muffled compared to more linear competitors like the JBL Xtreme 4 unless the bass dial is dialed back. The Marshall Kilburn II retains slightly punchier perceived loudness at maximum volume due to a more aggressive V-shaped contour. At 2.85 kg with only IP54 splash resistance, it is heavy and cannot withstand water immersion. Lacks a built-in microphone and LDAC codec support.

Full Marshall Kilburn III review and specifications →

ReleasedMay 2025 (1 year ago)
Amplifier Power50W
AppYes
Aux InputYes
Bass Extension (-10dB)45Hz
Battery Life50 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsSBC, AAC
Bluetooth Version5.3
Built-in MicrophoneNo
Digital Aux InputNo
Dimensions10.7” x 5.9” x 6.7” (272 x 150 x 170 mm)
Drivers1x 4” woofer + 2x 2” full-range drivers
EQYes
Frequency Response45Hz - 20kHz
IP RatingIP54
Maximum SPL91dB
OmnidirectionalNo
Party ModeYes (Auracast)
Power BankYes
Power InputUSB-C
StereoYes
StrapYes (built-in strap)
TWSYes
Weight6.3 lbs (2.85 kg)
Check current price at Amazon ($379.99) →Search eBay for Marshall Kilburn III →