Short answer: the Harman Kardon Onyx Studio 8, because the Aiwa Exos-9 is no longer sold new. The Onyx Studio 8 has a warm sound with boosted bass, though it is not as loud as others. The Exos-9 still sounds great even against today’s models, but its features are lacking and it is generally not recommended anymore.
On the Aiwa Exos-9 side: Still a great sounding speaker even against today’s models. The tradeoff: Features are lacking, generally not recommended anymore, not sold new anymore.
The case for the Harman Kardon Onyx Studio 8: Warm sound with boosted bass. Set against that: Not as loud as others.
Buy the Harman Kardon Onyx Studio 8 if you want one new; the Aiwa Exos-9 is discontinued, so only look for it used.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Aiwa Exos-9 | Harman Kardon Onyx Studio 8 | |
|---|---|---|
| Price | $250 Discontinued | $199.00 |
| Ranked | #8 of 75 in Boombox Size Portable Bluetooth Speakers | #11 of 75 in Boombox Size Portable Bluetooth Speakers |
| App | No | Yes (Harman Kardon One app) |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 44Hz | 35Hz |
| Battery Life | 10 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | Yes |
| EQ | Yes (5-band graphic EQ + 4 presets) | Yes (App EQ) |
| IP Rating | None | None |
| Party Mode | No | No |
| Power Input | AC Power cable | DC Barrel Connector (19V/2.1A) |
| Stereo | Yes | Partially (1 woofer) |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 15.2 lbs (6.9 kg) | 7.3 lbs (3.3 kg) |
| Power Bank | Yes (USB-A) | No |
| USB Playback | No | No |
| FM Tuner | No | - |
| Microphone Input | Yes (with adapter) | - |
| Amplifier Power | 200W | 50W RMS |
| Dimensions | 19.4" x 7.5" x 11.7" (492.8 x 190.5 x 297.2 mm) | 10.6" x 11.9" x 6.3" (268 x 302.5 x 159.5 mm) |
| Drivers | 6.5" dual voice coil woofer + 2x 3" midwoofers + 2x 1" silk dome tweeters | 120mm woofer + 2x 20mm tweeters |
| Discontinued | Yes | - |
| Digital Aux Input | No | No |
| Bluetooth Version | 4.2 | 5.2 |
| Aux Latency | - | 42ms |
| Bluetooth Latency | - | 175ms |
| Maximum SPL | - | 96dB (measured by Alan Ross Reviews) |
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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.
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The Two Speakers In Full
Aiwa Exos-9: $250 Discontinued eBay
Pros: Aiwa Exos-9 uses 6.5” dual voice coil woofer + 2x 3” midwoofers + 2x 1” silk dome tweeters. Its 6.9 kg, claimed 10 hours (Manufacturer specified) battery life, aux input and stereo playback make it a practical option for its intended room or portable use. Measured bass extension of 44Hz (-10dB).
Cons: Bass is limited by its 44Hz specification. There is no companion app. Discontinued.
Full Aiwa Exos-9 review and specifications →
| Amplifier Power | 200W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 44Hz |
| Battery Life | 10 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 19.4" x 7.5" x 11.7" (492.8 x 190.5 x 297.2 mm) |
| Discontinued | Yes |
| Drivers | 6.5" dual voice coil woofer + 2x 3" midwoofers + 2x 1" silk dome tweeters |
| EQ | Yes (5-band graphic EQ + 4 presets) |
| FM Tuner | No |
| IP Rating | None |
| Microphone Input | Yes (with adapter) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A) |
| Power Input | AC Power cable |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | No |
| Weight | 15.2 lbs (6.9 kg) |
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons
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
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