Short answer: the Harman Kardon Luna if sound quality matters most, the Tronsmart Mirtune C3 if price matters most. The Harman Kardon Luna ranks #26 of 182 medium speakers, rated 4.0/5, at $290.99. The Tronsmart Mirtune C3 ranks #102, rated 3.1/5, at $29.99, $261 cheaper.
The Harman Kardon Luna is the better-sounding pick. A fully waterproof speaker with fairly balanced, bass rich sound, a separate tweeter, and stereo pairing with a second unit. Watch for: Boosted bass, and less detailed than higher-ranked speakers.
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 much less than the Harman Kardon Luna at 2.5 lbs (1.13 kg). It has an adjustable EQ, which the Harman Kardon Luna lacks. The catch: 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 when sound quality outweighs the price for you, and the Tronsmart Mirtune C3 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 | Tronsmart Mirtune C3 | |
|---|---|---|
| Price | $290.99 | $29.99 |
| Ranked | #26 of 182 in Medium Size Portable Bluetooth Speakers | #102 of 182 in Medium Size Portable Bluetooth Speakers |
| App | No | Yes (Tronsmart) |
| Aux Input | No | No |
| Bass Extension (-10dB) | 57Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 12 hours at 50% volume (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| EQ | No | 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 | Yes | - |
| Weight | 2.5 lbs (1.13 kg) | 1.2 lbs (0.53 kg) |
| Bluetooth Version | 5.3 | 6.0 |
| Dimensions | 8.3” x 3.1” x 3.1” (210 x 78 x 80 mm) | 7.1”H x 2.8”W x 2.8”D (180 x 70 x 72 mm) |
| Drivers | 48mm x 90mm woofer, 20mm tweeter | 1x racetrack woofer + 1x tweeter |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | 55Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 40W | 30W |
| Digital Aux Input | No | Yes (USB-C) |
| Battery Capacity | - | 14.8Wh (7.4V, 2000mAh) |
| Charging Time | - | 2 hours |
| Party Mode | - | Yes (Auracast) |
| Strap | - | Yes (lanyard) |
Where the Ratings Come From
- Harman Kardon Luna: reviews by Oluv, Alan Ross and Mateusz Cholewa.
- 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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