Earfun Uboom L Specifications and Review

Last updated: August 17, 2026

The Earfun Uboom L ranks #1 out of 136 total Medium Size Portable Bluetooth Speakers for sound quality. See Top Recommended Speakers By Attribute for all the top speaker suggestions.

Brand: EarFun

Prices on this page were last checked August 21, 2026 at 5:30 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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Earfun Uboom L - ranked #1 of 136 Medium Size Portable Bluetooth Speakers · Editor's rating 4.6/5
Check price at Amazon ($50 after coupon UBOOMLWC) →

#1 Earfun Uboom L: $50 after coupon UBOOMLWC Amazon Myearfun eBay

Pros: Tuned by Oluv and he knocked it out of the park. The audiophile choice. 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 volume level. Other speakers will need a different EQ at each volume level. For maximum volume without distortion use max volume - 1 step for most songs. Oluv left another higher volume for songs that are quiet. Amazing sounding at low levels as it boosts bass and treble at low levels to account for the equal-loudness contour.

Cons: Latency is high (400ms) without turning on low latency mode (66ms) which doesn’t work when two speakers are TWS paired. Low latency mode can be turned on by pressing the Bluetooth button twice. If latency in TWS paired mode is a very important feature, like if you watch a lot of video, you may want to choose another speaker. The power button can sometimes get accidentally pressed when put in a bag. The aux input has quite a bit of latency and isn’t recommended for video use.

Setup: Try setting up the Earfun App (Android or iOS) to see if that works. If not, you’ll need to flash firmware 1.2.7 to work with the app and set with Oluv’s EQ in the Earfun app which sounds the best. The instructions say that you need a USB3 cable, but most USB2 cables work just fine, try the one included with your phone. Check the current firmware version by turning it on, then pressing the power and Bluetooth buttons at the same time. To flash, turn the speaker off then hold down the Bluetooth button while plugging in the cable. To flash on a mac, see these instructions. In TWS mode, long press the outdoor button for 2 seconds to change TWS to Party mode and back.

How it compares: Just below it: Soundcore Motion 300 - $30 more, 3 fewer hours of battery life.

AppYes (firmware >= 1.2.6)
Aux InputYes
Aux Latency216ms
Bass Extension (-10dB)56Hz
Battery Life16 hours (Manufacturer specified)
Bluetooth CodecsAAC, SBC
Bluetooth Latency400ms normal / 66ms low latency mode
Bluetooth Version5.0
Built in MicrophoneYes
Digital Aux InputNo
Dimensions3.1" x 8.3" x 2.8" (78 x 210 x 72 mm)
Drivers2x 55mm drivers + 2x passive radiators
EQYes (10 band, firmware >= 1.2.6)
IP RatingIP67
Max Volume103dB
OmnidirectionalNo
Output Power28W
Party ModeNo
Power BankNo
Power InputUSB-C
StereoYes
TWSYes
Weight1.4 lbs / 650 g
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