Short answer: pick based on which sound signature and feature set you want, not price. The Studio 8 ranks #11 of 75 boombox speakers at $199, and the Studio 9 ranks #14 at $189.99, a difference of only $9.01.
The two generations trade bass depth for a different tonal balance. The Studio 8’s pros describe a “warm sound with boosted bass,” and its bass extension reaches down to 35Hz. The Studio 9’s own cons admit “not as deep bass as previous Onyx Studio speakers” (its extension is 41Hz) along with “slight recessed mids, boost in the upper mids, rolled off upper treble.” If a warm, bass-forward sound is what you want, the Studio 8 delivers it more directly; if you want more volume headroom, the Studio 9’s cons don’t mention loudness as a weak point the way the Studio 8’s do.
Loudness favors the newer model. The Studio 8’s own cons state it’s “not as loud as others” in its class, with a 96dB max volume rating, while the Studio 9 reaches 101dB.
What the Studio 9 adds over the Studio 8:
- Auracast multi-speaker connection alongside classic stereo pairing, which the Studio 8 doesn’t support.
- A move to USB-C charging, described in its own pros as an upgrade from the prior generation’s AC power brick.
- Three tweeters instead of two, paired with a single 120mm woofer versus the Studio 8’s two 75mm woofers.
What the Studio 8 keeps that the Studio 9 lacks: an aux input and a built-in microphone. Both share the same 50W RMS output, 8-hour battery life, and Harman Kardon One app with EQ, and neither carries a water resistance rating.
Buy the Harman Kardon Onyx Studio 8 if you want the warmer, deeper-bass sound signature and don’t need Auracast or extra volume headroom.
Buy the Harman Kardon Onyx Studio 9 if you want Auracast multi-speaker linking and a bit more max volume, and can accept a slightly thinner bass response and recessed mids in exchange.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Harman Kardon Onyx Studio 8 | Harman Kardon Onyx Studio 9 | |
|---|---|---|
| Price | $199.00 | $189.99 |
| Ranked | #11 of 75 in Boombox Size Portable Bluetooth Speakers | #14 of 75 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | No |
| Aux Latency | 42ms | - |
| Bass Extension (-10dB) | 35Hz | 41Hz |
| Battery Life | 8 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| Built-in Microphone | Yes | - |
| IP Rating | None | None |
| Bluetooth Latency | 175ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | 101dB (measured by Alan Ross Reviews) |
| Power Input | DC Barrel Connector (19V/2.1A) | AC Power Cable (2-Prong) |
| Stereo | Partially (1 woofer) | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 7.3 lbs (3.3 kg) | 9.3 lbs (4.2 kg) |
| App | Yes (Harman Kardon One app) | Yes (Harman Kardon One app) |
| Bluetooth Codecs | SBC | SBC |
| Power Bank | No | - |
| EQ | Yes (App EQ) | Yes (App EQ) |
| Party Mode | No | Yes (Auracast) |
| USB Playback | No | No |
| Bluetooth Version | 5.2 | 5.3 |
| Amplifier Power | 50W RMS | 50W RMS |
| Dimensions | 10.6" x 11.9" x 6.3" (268 x 302.5 x 159.5 mm) | 11.4" x 11.3" x 5.1" (289.2 x 287.5 x 130 mm) |
| Drivers | 120mm woofer + 2x 20mm tweeters | 120mm woofer + 3x 20mm tweeters |
| Digital Aux Input | No | No |
Related Speaker Comparisons
More worthwhile head-to-heads for 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 Encore Essential 2 vs Harman Kardon Onyx Studio 8
- JBL Partybox Encore vs Harman Kardon Onyx Studio 8
Prices on this page were last checked September 23, 2026 at 11:24 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
Harman Kardon Onyx Studio 8: $199.00 Amazon eBay
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. Measured bass extension of 35Hz (-10dB).
Cons: Bass is limited by its 35Hz specification.
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 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) |
| 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!
- Head-to-Head Comparisons
- Harman Kardon Onyx Studio 8 vs Harman Kardon Onyx Studio 6
- Harman Kardon Onyx Studio 8 vs Yeahbox Sonic Boom Ultra
- Harman Kardon Onyx Studio 8 vs Harman Kardon Onyx Studio 7
- Harman Kardon Onyx Studio 8 vs Vifa Copenhagen 2.0
- Harman Kardon Onyx Studio 8 vs Aiwa Exos-9
- Harman Kardon Onyx Studio 8 vs JBL Partybox Encore Essential
- Harman Kardon Onyx Studio 8 vs Zealot ZE51
- Harman Kardon Onyx Studio 8 vs JBL Partybox Encore
- See all 56 comparisons
Harman Kardon Onyx Studio 9: $189.99 Amazon eBay
Pros: An elegant 4.2kg living-room portable with a measured 41Hz -10dB bass point, 101dB maximum level, three tweeters, app EQ, stereo pairing and Auracast multi-speaker linking. Reviews praise its balanced, smooth presentation and non-fatiguing treble, making it a more music-focused choice than most party speakers. Measured bass extension of 41Hz (-10dB).
Cons: It has no water resistance, aux input or USB playback, and its eight-hour claimed battery life is short for an outdoor portable. Bass is less deep than some earlier Onyx Studio models, while the slightly recessed mids and rolled-off top end mean it is not the most open or detailed option; it still charges from an AC power cable rather than USB-C.
Full Harman Kardon Onyx Studio 9 review and specifications →
| Amplifier Power | 50W RMS |
|---|---|
| App | Yes (Harman Kardon One app) |
| Aux Input | No |
| Bass Extension (-10dB) | 41Hz |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Digital Aux Input | No |
| Dimensions | 11.4" x 11.3" x 5.1" (289.2 x 287.5 x 130 mm) |
| Drivers | 120mm woofer + 3x 20mm tweeters |
| EQ | Yes (App EQ) |
| IP Rating | None |
| Maximum SPL | 101dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Input | AC Power Cable (2-Prong) |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | No |
| Weight | 9.3 lbs (4.2 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Harman Kardon Onyx Studio 9 vs Harman Kardon Onyx Studio 7
- Harman Kardon Onyx Studio 9 vs Zealot ZE51
- Harman Kardon Onyx Studio 9 vs Zealot ZE41
- Harman Kardon Onyx Studio 9 vs Harman Kardon Onyx Studio 6
- Harman Kardon Onyx Studio 9 vs Zealot ZE21
- Harman Kardon Onyx Studio 9 vs Zealot S89
- Harman Kardon Onyx Studio 9 vs Yeahbox Sonic Boom Ultra
- Harman Kardon Onyx Studio 9 vs JBL Boombox 4
- See all 64 comparisons