Short answer: the Harman Kardon Luna 2, and it is the higher-ranked of the two. It places #25 of 172 against #37 of 172 for the Bose SoundLink Flex 2nd gen, with an articulate, spacious midrange and tight bass from its 62mm x 82mm woofer and passive radiator. The Flex sounds pretty much identical to the 1st gen but is not stereo, and it self-drains about 10% of battery a week.
Buy the Harman Kardon Luna 2. It is rated higher for sound quality, and the $40.95 you would save on the Bose Soundlink Flex 2nd gen does not close the gap.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Articulate, spacious midrange with precise imaging and instrument separation.
Amazon $199.95 B&H Photo Video $199.95 eBay
A very portable 586g, IP67-rated speaker with a clear, well-balanced midrange that keeps voices and instruments intelligible.
Amazon $159.00 eBayPrices on this page were last checked October 15, 2026 at 5:41 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.
Specifications Side By Side
| Harman Kardon Luna 2 | Bose Soundlink Flex 2nd gen | |
|---|---|---|
| Price | $199.95 | $159.00 |
| Ranked | #25 of 172 in Medium Size Portable Bluetooth Speakers | #37 of 172 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, aptX Adaptive |
| EQ | Yes (4 presets + custom) | Yes (3 band) |
| IP Rating | IP67 | IP67 |
| MicroSD Playback | No | - |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | No | - |
| Weight | 1.6 lbs (735 g) | 1.3 lbs (586 g) |
| Bluetooth Version | 5.4 | 5.3 |
| Dimensions | 8.5” x 3.3” x 3.2” (216 x 84 x 81 mm) | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) |
| Drivers | 62mm x 82mm woofer with passive radiator, 20mm tweeter | 60mm full-range driver with passive radiators |
| Frequency Response | 58Hz - 20kHz (-6dB) (Manufacturer specified) | - |
| Amplifier Power | 40W (25W woofer + 15W tweeter) | - |
| Digital Aux Input | No | No |
| Strap | No | Yes (built-in loop) |
| Built-in Microphone | - | Yes |
| Party Mode | - | Yes (Bose Party mode) |
Related Speaker Comparisons
More worthwhile head-to-heads for Harman Kardon Luna 2: