Short answer: the Harman Kardon Luna. It ranks #24 of 150 medium speakers by sound quality, rated 4.0/5, at $290.99. The Teufel Rockster Go 2 ranks #80, rated 3.2/5, at $129.99, $161 cheaper, a saving that is not big enough to make up the sound-quality gap.
Why pick the Harman Kardon Luna: Harman Kardon Luna uses 48mm x 90mm woofer, 20mm tweeter. The catch: Bass is limited by its 57Hz specification.
The case for the Teufel Rockster Go 2: At 0.74 kg, the IP67 Rockster Go 2 is genuinely easy to carry, and its claimed 28-hour battery life, USB-C fast charging, stereo pairing, and tripod mount suit outdoor use. The tradeoff: There is no companion app or 3.5 mm input.
Buy the Harman Kardon Luna. It is rated higher for sound quality, and saving $161 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.
Specifications Side By Side
| Harman Kardon Luna | Teufel Rockster Go 2 | |
|---|---|---|
| Price | $290.99 | $129.99 |
| Ranked | #24 of 150 in Medium Size Portable Bluetooth Speakers | #80 of 150 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) |
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Prices on this page were last checked September 30, 2026 at 2:57 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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The Two Speakers In Full
Harman Kardon Luna: $290.99 Amazon eBay
Newer model: the Harman Kardon Luna 2, ranked higher, rated 4.1/5.
Pros: Harman Kardon Luna uses 48mm x 90mm woofer, 20mm tweeter. Its 1.13 kg, claimed 12 hours (Manufacturer specified) battery life, IP67 protection and mono playback make it a practical option for its intended room or portable use. The sound is fairly balanced apart from the boosted bass. Measured bass extension of 57Hz (-10dB).
Cons: Bass is limited by its 57Hz specification. There is no companion app. No EQ adjustment. Boosted bass, and less detailed than higher-ranked speakers.
Full Harman Kardon Luna review and specifications →
| Amplifier Power | 40W |
|---|---|
| App | No |
| Aux Input | No |
| Bass Extension (-10dB) | 57Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Digital Aux Input | No |
| Dimensions | 8.3” x 3.1” x 3.1” (210 x 78 x 80 mm) |
| Drivers | 48mm x 90mm woofer, 20mm tweeter |
| EQ | No |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP67 |
| MicroSD Playback | No |
| Omnidirectional | No |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 2.5 lbs (1.13 kg) |
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Teufel Rockster Go 2: $129.99 Amazon eBay
Older model: the Teufel Rockster Go (ranked lower, rated 2.6/5).
Pros: At 0.74 kg, the IP67 Rockster Go 2 is genuinely easy to carry, and its claimed 28-hour battery life, USB-C fast charging, stereo pairing, and tripod mount suit outdoor use. Independent listening found a balanced, clear midrange and tuneful bass at sensible levels.
Cons: There is no companion app or 3.5 mm input. Reviewers found it loses some definition at maximum volume, and the claimed battery figure is optimistic for loud outdoor playback.
Full Teufel Rockster Go 2 review and specifications →
| Amplifier Power | 8W |
|---|---|
| App | Yes (Teufel Go) |
| Aux Input | No |
| Battery Life | 15 hours, 28 with Eco Mode (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC |
| Built-in Microphone | No |
| Charging Time | 2.5 hours (Manufacturer specified) |
| Digital Aux Input | Yes (USB-C sound card) |
| Dimensions | 8.3” x 4.3” x 2.4” (211 x 109 x 61 mm) |
| Drivers | 2x 50mm wide-band drivers + 1x 64mm passive radiator |
| EQ | Yes |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP67 |
| Omnidirectional | No |
| Party Mode | Yes (Party Link, up to 100 speakers) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (detachable strap) |
| TWS | Yes |
| USB Playback | No |
| Weight | 1.6 lbs (735 g) |
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