Earfun Uboom X vs Harman Kardon Go + Play 3 (August 2026)

Short answer: the Earfun Uboom X. It ranks #1 of 70 boombox speakers at $128; the Harman Kardon Go + Play 3 ranks #3 and costs $385, so there is not much of a tradeoff to weigh.

On the Earfun Uboom X side: Tuned by Oluv and he knocked it out of the park again. The catch: The out of the box 0.33 firmware and EQ sounds horrible.

The case for the Harman Kardon Go + Play 3: Warm sound with boosted bass. The catch: Just a little over half as loud as the higher rated boomboxes.

One note: the Earfun Uboom X is discontinued, but it still ranks #1 of 70 boombox speakers, ahead of most of what is still sold new, so it is worth considering used.

Buy the Earfun Uboom X if the ranking matters more than the price. Buy the Harman Kardon Go + Play 3 if the price matters more than the ranking.

Specifications Side By Side

	Earfun Uboom X	Harman Kardon Go + Play 3
Price	$128 Discontinued	$385
Ranked	#1 of 70 in Boombox Size Portable Bluetooth Speakers	#3 of 70 in Boombox Size Portable Bluetooth Speakers
App	Yes (Earfun Audio app)	Yes (Harman Kardon One app)
Aux Input	Yes	Yes
Aux Latency	16ms	112ms
Bass Extension (-10dB)	~38Hz	35Hz
Battery Life	30 hours (Manufacturer specified)	8 hours (Manufacturer specified)
Bluetooth Codecs	AAC, SBC	SBC, AAC
Built in Microphone	Yes	Yes
EQ	Yes (App EQ)	Yes (App EQ)
IP Rating	IP67	None
Bluetooth Latency	SBC Video mode 48ms, AAC Video mode 128ms, SBC 112ms, AAC 176ms	120ms
Max Volume	110dB	103dB
Party Mode	Yes (Up to 50 speakers)	No
Power Bank	Yes	Yes
Power Input	USB-C	AC Power brick
TWS	Yes	Yes
Weight	9 lbs / 4.1 kg	10.4 lbs / 4.7 kg
Stereo	Yes	Yes
USB Playback	No	No
FM Tuner	No	-
Bluetooth Version	5.3	5.2
Output Power	80W	160W RMS
Dimensions	15.75" x 5.91" x 8.46" (400 x 150 x 215 mm)	17.28" x 9.45" x 7.56" (439 x 240 x 192 mm)
Drivers	2x 102mm (4") woofers + 2x 20mm tweeters	1x 130mm (5") subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters
Discontinued	Yes	-

The Two Speakers In Full

Earfun Uboom X: $128 Discontinued Myearfun Amazon

Pros: Tuned by Oluv and he knocked it out of the park again. Deeper bass than the 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.

Cons: The out of the box 0.33 firmware and EQ sounds horrible. Some people have mentioned sound interruption issues when using 2 in TWS, I don’t have this issue with my Pixel 7 Pro, try disabling AAC in that case. 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

App	Yes (Earfun Audio app)
Aux Input	Yes
Aux Latency	16ms
Bass Extension (-10dB)	~38Hz
Battery Life	30 hours (Manufacturer specified)
Bluetooth Codecs	AAC, SBC
Bluetooth Latency	SBC Video mode 48ms, AAC Video mode 128ms, SBC 112ms, AAC 176ms
Bluetooth Version	5.3
Built in Microphone	Yes
Dimensions	15.75" x 5.91" x 8.46" (400 x 150 x 215 mm)
Discontinued	Yes
Drivers	2x 102mm (4") woofers + 2x 20mm tweeters
EQ	Yes (App EQ)
FM Tuner	No
IP Rating	IP67
Max Volume	110dB
Output Power	80W
Party Mode	Yes (Up to 50 speakers)
Power Bank	Yes
Power Input	USB-C
Stereo	Yes
TWS	Yes
USB Playback	No
Weight	9 lbs / 4.1 kg

Check current price at Amazon ($128) →Check current price at Myearfun →

Harman Kardon Go + Play 3: $385 Amazon Ebay Refurbished

Pros: Warm sound with boosted bass. Deepest bass out of any speaker in this size. Sound is more natural than the Go + Play2.

Cons: Just a little over half as loud as the higher rated boomboxes. Only 8 hours of battery at medium volume. No water rating.

Setup: Use the hidden EQ modes to adjust the bass up when outside and down when inside. To adjust bass, quickly press the bluetooth and volume down buttons together, the number of light flashes tell you what mode you’re in. To adjust treble, quickly press the volume up and phone buttons at the same time, the number of yellow flashes on the light tell you what mode you are in.

App	Yes (Harman Kardon One app)
Aux Input	Yes
Aux Latency	112ms
Bass Extension (-10dB)	35Hz
Battery Life	8 hours (Manufacturer specified)
Bluetooth Codecs	SBC, AAC
Bluetooth Latency	120ms
Bluetooth Version	5.2
Built in Microphone	Yes
Dimensions	17.28" x 9.45" x 7.56" (439 x 240 x 192 mm)
Drivers	1x 130mm (5") subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters
EQ	Yes (App EQ)
IP Rating	None
Max Volume	103dB
Output Power	160W RMS
Party Mode	No
Power Bank	Yes
Power Input	AC Power brick
Stereo	Yes
TWS	Yes
USB Playback	No
Weight	10.4 lbs / 4.7 kg

Check current price at Amazon ($385) →Check current price at Ebay Refurbished →

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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.