Short answer: the Monster Rockin’ Roller 270, if you are buying new. The Harman Kardon Onyx Studio 8 ranks higher than it (#12 vs #82 of 89 boombox speakers, 4.1/5 vs 2.1/5) but is discontinued, so only consider it used; the Monster Rockin’ Roller 270 is still sold new at $249.
Why pick the Harman Kardon Onyx Studio 8: At 3.3 kg, Harman Kardon Onyx Studio 8 combines a 120mm woofer and 2x 20mm tweeters with Bluetooth and aux. The tradeoff: Bass is limited by its 35Hz specification.
What the Monster Rockin’ Roller 270 does well: 100 hour battery life. The tradeoff: Bass not as deep as competitors, less neutral than ION speakers.
Buy the Monster Rockin’ Roller 270 if you want one new; the Harman Kardon Onyx Studio 8 is discontinued, so only look for it used.
There is a real gap in water resistance: the Monster Rockin’ Roller 270 at IPX4 (splashing) against the Harman Kardon Onyx Studio 8, which has no water resistance.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Harman Kardon Onyx Studio 8 | Monster Rockin’ Roller 270 | |
|---|---|---|
| Price | $197.90 Discontinued | $249.00 |
| Ranked | #12 of 89 in Boombox Size Portable Bluetooth Speakers | #82 of 89 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Aux Latency | 42ms | - |
| Bass Extension (-10dB) | 35Hz | 53Hz |
| Battery Life | 8 hours (Manufacturer specified) | 100 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| IP Rating | None | IPX4 |
| Bluetooth Latency | 175ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | 96dB (Manufacturer specified) |
| Power Input | DC Barrel Connector (19V/2.1A) | USB-C |
| Stereo | Partially (1 woofer) | No |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 7.3 lbs (3.3 kg) | 28.7 lbs (13 kg) |
| App | Yes (Harman Kardon One app) | Yes (Monster Zone Control app) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Power Bank | No | Yes (USB-A, 5V/2.1A) |
| EQ | Yes (App EQ) | Yes |
| Party Mode | No | No |
| USB Playback | No | No |
| Bluetooth Version | 5.2 | 5.0 |
| Amplifier Power | 50W RMS | 200W |
| Dimensions | 10.6” x 11.9” x 6.3” (268 x 302.5 x 159.5 mm) | 15” x 18.6” x 10.9” (381 x 472 x 276 mm) |
| Drivers | 120mm woofer + 2x 20mm tweeters | 2x 3” (76mm) woofers + 2x tweeters (size undisclosed) |
| Digital Aux Input | No | No |
| Strap | No | No |
| FM Tuner | - | Yes |
| Wheels | - | Yes |
Related Speaker Comparisons
More top alternatives to Harman Kardon Onyx Studio 8:
- Tribit Stormbox Blast vs Harman Kardon Onyx Studio 8
- Harman Kardon Go + Play 3 vs Harman Kardon Onyx Studio 8
- JBL Partybox Encore 2 vs Harman Kardon Onyx Studio 8
- JBL PartyBox On-The-Go 2 Plus vs Harman Kardon Onyx Studio 8
- JBL Partybox Encore Essential 2 vs Harman Kardon Onyx Studio 8
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 Onyx Studio 8: $197.90 Discontinued Amazon eBay
Newer model: the Harman Kardon Onyx Studio 9, ranked lower, rated 4.1/5.
Pros: At 3.3 kg, Harman Kardon Onyx Studio 8 combines a 120mm woofer and 2x 20mm tweeters with Bluetooth and aux. Claimed 8 hours (manufacturer specified) battery life and up to 96db make its feature set practical for its intended room or portable use. A built-in microphone and the Harman Kardon One app with EQ. Measured bass extension of 35Hz (-10dB).
Cons: Bass is limited by its 35Hz specification. Warm tuning with boosted bass, not as loud as others, and no water resistance rating. Discontinued.
Full Harman Kardon Onyx Studio 8 review and specifications →
| Amplifier Power | 50W RMS |
|---|---|
| App | Yes (Harman Kardon One app) |
| Aux Input | Yes |
| Aux Latency | 42ms |
| Bass Extension (-10dB) | 35Hz |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Latency | 175ms |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 10.6” x 11.9” x 6.3” (268 x 302.5 x 159.5 mm) |
| Drivers | 120mm woofer + 2x 20mm tweeters |
| EQ | Yes (App EQ) |
| IP Rating | None |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | DC Barrel Connector (19V/2.1A) |
| Stereo | Partially (1 woofer) |
| Strap | No |
| TWS | Yes |
| USB Playback | No |
| Weight | 7.3 lbs (3.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: Harman Kardon Onyx Studio 8 review - part 2 of 3 More from alanrossreviews →
- Alan Ross Reviews: Onyx Studio 8 vs HK Onyx 6, Xtreme 3, PartyBox Encore, Go+ Play, Bag of Riddim! part 3 of 3
- Alan Ross Reviews: Dead room vs Live room - Onyx studio 8 self tuning test! part 1 of 3
- Alan Ross Reviews: Ultimate HK Onyx Studio speaker review and comparison! 8 speakers!
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Monster Rockin’ Roller 270: $249.00 Amazon eBay
Pros: 100 hour battery life. 270° sound coverage, stereo output. IPX4 weather-resistant. Wheels and integrated handle. Qi wireless charging pad for your phone. TWS pairing with another 270. Measured bass extension of 53Hz (-10dB).
Cons: Bass not as deep as competitors, less neutral than ION speakers. Very heavy
Full Monster Rockin’ Roller 270 review and specifications →
| Amplifier Power | 200W |
|---|---|
| App | Yes (Monster Zone Control app) |
| Aux Input | Yes |
| Bass Extension (-10dB) | 53Hz |
| Battery Life | 100 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.0 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 15” x 18.6” x 10.9” (381 x 472 x 276 mm) |
| Drivers | 2x 3” (76mm) woofers + 2x tweeters (size undisclosed) |
| EQ | Yes |
| FM Tuner | Yes |
| IP Rating | IPX4 |
| Maximum SPL | 96dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A, 5V/2.1A) |
| Power Input | USB-C |
| Stereo | No |
| Strap | No |
| TWS | Yes |
| USB Playback | No |
| Weight | 28.7 lbs (13 kg) |
| Wheels | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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