Short answer: the Harman Kardon Luna. It ranks #26 of 182 medium speakers by sound quality, rated 4.0/5, at $290.99. The Teufel Rockster Go 2 ranks #93, rated 3.2/5, at $99.99, $191 cheaper, a saving that is not big enough to make up the sound-quality gap.
The Harman Kardon Luna is the better-sounding choice. A fully waterproof speaker with fairly balanced, bass rich sound, a separate tweeter, and stereo pairing with a second unit. The tradeoff: Boosted bass, and less detailed than higher-ranked speakers.
The Teufel Rockster Go 2 is the lighter pick. A light, rugged waterproof speaker with very long battery life in eco mode, stereo pairing and a tripod mount. At 1.6 lbs (735 g) it weighs noticeably less than the Harman Kardon Luna at 2.5 lbs (1.13 kg). It supports AAC Bluetooth, which the Harman Kardon Luna lacks. It has an adjustable EQ, which the Harman Kardon Luna lacks. The catch: There is no companion app or 3.5 mm input.
Buy the Harman Kardon Luna. It is rated higher for sound quality, and saving $191 with the Teufel Rockster Go 2 does not make up for the sound-quality gap.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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 | Teufel Rockster Go 2 | |
|---|---|---|
| Price | $290.99 | $99.99 |
| Ranked | #26 of 182 in Medium Size Portable Bluetooth Speakers | #93 of 182 in Medium Size Portable Bluetooth Speakers |
| App | No | Yes (Teufel Go) |
| Aux Input | No | No |
| Bass Extension (-10dB) | 57Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 15 hours, 28 with Eco Mode (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC |
| EQ | No | Yes |
| IP Rating | IP67 | IP67 |
| MicroSD Playback | No | - |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | No |
| Weight | 2.5 lbs (1.13 kg) | 1.6 lbs (735 g) |
| Bluetooth Version | 5.3 | - |
| Dimensions | 8.3” x 3.1” x 3.1” (210 x 78 x 80 mm) | 8.3” x 4.3” x 2.4” (211 x 109 x 61 mm) |
| Drivers | 48mm x 90mm woofer, 20mm tweeter | 2x 50mm wide-band drivers + 1x 64mm passive radiator |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | 60Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 40W | 8W |
| Digital Aux Input | No | Yes (USB-C sound card) |
| Party Mode | - | Yes (Party Link, up to 100 speakers) |
| Built-in Microphone | - | No |
| Power Bank | - | No |
| Charging Time | - | 2.5 hours (Manufacturer specified) |
| Strap | - | Yes (detachable strap) |
Where the Ratings Come From
- Harman Kardon Luna: reviews by Oluv, Alan Ross and Mateusz Cholewa.
- Teufel Rockster Go 2: reviews by Techder Audios and Tong Zou.
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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