Short answer: the Bogasing G4. Both are rated 4.0/5 for sound quality (#27 and #26 of 177 medium speakers), and the Bogasing G4 costs $42.49 against $290.99 for the Harman Kardon Luna, with sound quality a draw, the lower price decides it.
What the Harman Kardon Luna does well: A fully waterproof speaker with fairly balanced, bass rich sound, a separate tweeter, and stereo pairing with a second unit. The tradeoff: Bass is limited by its 57Hz specification.
The Bogasing G4 is the longer-running, lighter option. A light, affordable waterproof speaker with surprisingly strong bass for its size, solid loudness, long battery life and stereo pairing. It is rated for 24 hours of battery against 12 for the Harman Kardon Luna. At 1.8 lbs (830 g) it weighs noticeably less than the Harman Kardon Luna at 2.5 lbs (1.13 kg). It keeps a wired aux input, which the Harman Kardon Luna lacks. The catch: The upper treble is boosted and uneven, while the mids sit slightly behind the bass and highs, so it is not a neutral choice for vocal-focused music.
Buy the Bogasing G4. Both are rated the same for sound quality, and it costs $248.50 less than the Harman Kardon Luna.
Want more options? Browse the full Portable Bluetooth rankings.
A fully waterproof speaker with fairly balanced, bass rich sound, a separate tweeter, and stereo pairing with a second unit.
A light, affordable waterproof speaker with surprisingly strong bass for its size, solid loudness, long battery life and stereo pairing.
Prices on this page were last checked October 31, 2026 at 7:11 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 | Bogasing G4 | |
|---|---|---|
| Price | $290.99 | $42.49 |
| Ranked | #26 of 177 in Medium Size Portable Bluetooth Speakers | #27 of 177 in Medium Size Portable Bluetooth Speakers |
| App | No | No |
| Aux Input | No | Yes |
| Bass Extension (-10dB) | 57Hz | 56Hz |
| Battery Life | 12 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | LE Audio with LC3 |
| EQ | No | No |
| IP Rating | IP67 | IPX7 |
| MicroSD Playback | No | Yes |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | - |
| Weight | 2.5 lbs (1.13 kg) | 1.8 lbs (0.83 kg) |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 8.3” x 3.1” x 3.1” (210 x 78 x 80 mm) | 8.9”H x 2.5”W x 3.4”D (225 x 64 x 86 mm) |
| Drivers | 48mm x 90mm woofer, 20mm tweeter | Two drivers and passive radiators |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 40W | 50W |
| Digital Aux Input | No | No |
| Aux Latency | - | 16ms |
| Bluetooth Latency | - | 90ms |
| Maximum SPL | - | 100dB (measured by Alan Ross Reviews) |
| Party Mode | - | No |
Related Speaker Comparisons
More worthwhile head-to-heads for Harman Kardon Luna: