Short answer: the Harman Kardon Luna 2 if sound quality matters most, the Tronsmart Mirtune C3 if price matters most. The Harman Kardon Luna 2 ranks #25 of 182 medium speakers, rated 4.1/5, at $199.95. The Tronsmart Mirtune C3 ranks #102, rated 3.1/5, at $29.99, $169.96 cheaper.
The Harman Kardon Luna 2 is the better-sounding pick. A stylish waterproof speaker with clear, spacious mids, tight bass that stays clean at volume, and stereo pairing with a second unit. The catch: Treble can sound bright and edgy, and it loses more output off-axis than some rivals.
The Tronsmart Mirtune C3 is the lighter pick. A small, light waterproof speaker at a budget price, with Auracast multi speaker sync, stereo pairing, USB-C audio input and app EQ. At 1.2 lbs (530 g) it weighs noticeably less than the Harman Kardon Luna 2 at 1.6 lbs (735 g). Watch for: In GiT’s three way blind test it came behind the Creative Muvo Go and Xiaomi Sound Outdoor, sounding good only on sparse tracks, and listeners in AudioPro Reviews’ comparison found the JBL Flip 6 fuller with more bass.
Buy the Harman Kardon Luna 2 when sound quality outweighs the price for you, and the Tronsmart Mirtune C3 when the price outweighs sound quality instead.
Want more options? Browse the full Portable Bluetooth rankings.
Prices on this page were last checked November 14, 2026 at 6:17 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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Specifications Side By Side
| Harman Kardon Luna 2 | Tronsmart Mirtune C3 | |
|---|---|---|
| Price | $199.95 | $29.99 |
| Ranked | #25 of 182 in Medium Size Portable Bluetooth Speakers | #102 of 182 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes (Tronsmart) |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 12 hours at 50% volume (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| EQ | Yes (4 presets + custom) | Yes (app) |
| IP Rating | IP67 | IPX7 |
| 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) | 1.2 lbs (0.53 kg) |
| Bluetooth Version | 5.4 | 6.0 |
| Dimensions | 8.5” x 3.3” x 3.2” (216 x 84 x 81 mm) | 7.1”H x 2.8”W x 2.8”D (180 x 70 x 72 mm) |
| Drivers | 62mm x 82mm woofer with passive radiator, 20mm tweeter | 1x racetrack woofer + 1x tweeter |
| Frequency Response | 58Hz - 20kHz (-6dB) (Manufacturer specified) | 55Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 40W (25W woofer + 15W tweeter) | 30W |
| Digital Aux Input | No | Yes (USB-C) |
| Strap | No | Yes (lanyard) |
| Battery Capacity | - | 14.8Wh (7.4V, 2000mAh) |
| Charging Time | - | 2 hours |
| Party Mode | - | Yes (Auracast) |
Where the Ratings Come From
- Harman Kardon Luna 2: reviews by Joy & Oluv’Sone, Mateusz Cholewa and Storytripper HD.
- Tronsmart Mirtune C3: reviews by THBOX, GiT and AudioPro.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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