Bose Soundlink Flex 2nd gen vs W-King D320

Last updated: September 26, 2026

Short answer: the W-King D320 for features, the Bose Soundlink Flex 2nd gen for simplicity. The D320 packs 40W, IP67 waterproofing, 24 hour battery life, an EQ app with 6 modes, Bluetooth 5.3, AUX and MicroSD, dual tweeters with passive radiators and USB-C, but it is not stereo, has a warm tuning, lacks some detail and has rolled off treble. The Flex 2nd gen is not stereo and its warm, overly boosted bass drowns out midrange detail.

Bose Soundlink Flex 2nd gen vs W-King D320

The case for the Bose Soundlink Flex 2nd gen: It sounds pretty much identical to the 1st gen. The catch: it’s not stereo, sounds warm with overly boosted bass that drowns out midrange detail, and self drains the battery about 10% a week.

Buy the Bose Soundlink Flex 2nd gen when sound quality outweighs the price for you, and the W-King D320 when the price outweighs sound quality instead.

If battery life is a priority, the W-King D320 is rated for 24 hours versus 12 hours for the Bose Soundlink Flex 2nd gen.

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

Buy the Bose Soundlink Flex 2nd gen at Amazon ($159.00) →Buy the W-King D320 at AliExpress ($52.92) →

Specifications Side By Side

Bose Soundlink Flex 2nd gen W-King D320
Price$159.00$69.99
Ranked#35 of 145 in Medium Size Portable Bluetooth Speakers#47 of 145 in Medium Size Portable Bluetooth Speakers
AppYesYes
Battery Life12 hours (Manufacturer specified)24 hours (Manufacturer specified)
Built-in MicrophoneYesYes
EQYes (3 band)Yes
IP RatingIP67IP67
Party ModeYes (Bose Party mode)-
Power InputUSB-CUSB-C
StereoNoNo
OmnidirectionalNoNo
TWSYesNo
Weight1.3 lbs (586 g)3.1 lbs (1.4 kg)
Bluetooth Version5.35.3
Dimensions7.9” x 3.5” x 2” (201 x 90 x 52 mm)3.3” x 8.4” (83 x 214 mm) (diameter x height)
Aux InputNoYes
Drivers60mm full-range driver with passive radiators52mm x 91mm woofer, 2x 25mm tweeters + 2x passive radiators
Bluetooth CodecsSBC, AAC, aptX AdaptiveSBC (inferred; additional codecs unverified)
Digital Aux InputNoNo
StrapYes (built-in loop)-
MicroSD Playback-Yes
Frequency Response-100Hz - 18kHz (Manufacturer specified)
Amplifier Power-40W
Buy the Bose Soundlink Flex 2nd gen at Amazon ($159.00) →Buy the W-King D320 at AliExpress ($52.92) →

More worthwhile head-to-heads for Bose Soundlink Flex 2nd gen:

Prices on this page were last checked September 26, 2026 at 11:14 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

Bose Soundlink Flex 2nd gen ranking card

Older model: the Bose Soundlink Flex (ranked lower, rated 3.8/5).

Pros: A very portable 586g, IP67-rated speaker with a clear, well-balanced midrange that keeps voices and instruments intelligible. The second generation adds a Bose app with 3-band EQ, better-placed controls and stereo pairing with another Bose Soundlink Flex 2nd gen. It supports AAC and aptX Adaptive in addition to SBC, making it a stronger wireless option than most small rivals.

Cons: One Flex remains mono and cannot deliver genuine low-bass rumble; RTINGS also found the elevated treble can turn hi-hats and other high-frequency detail piercing. The claimed battery life is only 12 hours, and some owners report accelerated standby drain after firmware updates. It is expensive for its size, so the added app and codec support, not a transformational sound upgrade over the original, are the main reasons to choose it.

Full Bose Soundlink Flex 2nd gen review and specifications →

AppYes
Aux InputNo
Battery Life12 hours (Manufacturer specified)
Bluetooth CodecsSBC, AAC, aptX Adaptive
Bluetooth Version5.3
Built-in MicrophoneYes
Digital Aux InputNo
Dimensions7.9” x 3.5” x 2” (201 x 90 x 52 mm)
Drivers60mm full-range driver with passive radiators
EQYes (3 band)
IP RatingIP67
OmnidirectionalNo
Party ModeYes (Bose Party mode)
Power InputUSB-C
StereoNo
StrapYes (built-in loop)
TWSYes
Weight1.3 lbs (586 g)
Check current price at Amazon ($159.00) →Search eBay for Bose Soundlink Flex 2nd gen →

W-King D320: $69.99 AliExpress eBay

W-King D320 ranking card

Pros: A 1.4kg, IP67-rated travel speaker with claimed 40W output, USB-C charging, aux and microSD playback, speakerphone capability and an app with adjustable EQ. Owner reports praise its loud, deep-for-size bass and long runtime, while its two tweeters and passive radiators make it a capable choice for casual outdoor listening.

Cons: A single D320 is not stereo, and its warm balance trades away some detail and upper-treble air. The claimed 100Hz low-frequency specification suggests that its perceived bass should not be mistaken for true sub-bass; evaluate its tuning with the app rather than expecting a neutral default.

Full W-King D320 review and specifications →

Amplifier Power40W
AppYes
Aux InputYes
Battery Life24 hours (Manufacturer specified)
Bluetooth CodecsSBC (inferred; additional codecs unverified)
Bluetooth Version5.3
Built-in MicrophoneYes
Digital Aux InputNo
Dimensions3.3” x 8.4” (83 x 214 mm) (diameter x height)
Drivers52mm x 91mm woofer, 2x 25mm tweeters + 2x passive radiators
EQYes
Frequency Response100Hz - 18kHz (Manufacturer specified)
IP RatingIP67
MicroSD PlaybackYes
OmnidirectionalNo
Power InputUSB-C
StereoNo
TWSNo
Weight3.1 lbs (1.4 kg)
Check current price at AliExpress ($52.92) →Search eBay for W-King D320 →