Short answer: the Harman Kardon Luna 2 on measured sound quality, the Tronsmart Mirtune C3 Plus on price. The Harman Kardon Luna 2 ranks #25 of 182 medium speakers, rated 4.1/5, at $199.95. The Tronsmart Mirtune C3 Plus ranks #84, rated 3.3/5, at $49.99, $149.96 cheaper.
The Harman Kardon Luna 2 is the better-sounding option. 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.
Why pick the Tronsmart Mirtune C3 Plus: An affordable waterproof speaker with a separate tweeter, app EQ, Auracast linking, stereo pairing and USB-C audio input. Watch for: In side by side tests by Clinch Audio Bass and Mateusz Cholewa, the Xiaomi Sound Party and Soundcore Boom 3i sounded more refined and fuller, and listeners described the C3 Plus’s treble as dull.
Buy the Harman Kardon Luna 2 when sound quality outweighs the price for you, and the Tronsmart Mirtune C3 Plus when the price outweighs sound quality instead.
Looking for alternatives? See the complete 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 Plus | |
|---|---|---|
| Price | $199.95 | $49.99 |
| Ranked | #25 of 182 in Medium Size Portable Bluetooth Speakers | #84 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) | 1.8 lbs (0.81 kg) |
| Bluetooth Version | 5.4 | 6.0 |
| Dimensions | 8.5” x 3.3” x 3.2” (216 x 84 x 81 mm) | 8.3”H x 3.1”W x 3.3”D (210 x 80 x 85 mm) |
| Drivers | 62mm x 82mm woofer with passive radiator, 20mm tweeter | 1x racetrack woofer + 1x tweeter |
| Frequency Response | 58Hz - 20kHz (-6dB) (Manufacturer specified) | 50Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 40W (25W woofer + 15W tweeter) | 50W |
| Digital Aux Input | No | Yes (USB-C) |
| Strap | No | Yes (lanyard) |
| Charging Time | - | 4 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 Plus: reviews by Oluv, Mateusz Cholewa and Techder Audios.
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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