These are not really the same size class, and that is the honest framing here. The JBL Partybox Encore 2 ranks #4 of 113 boombox speakers by sound quality at $330; the Marshall Stockwell III ranks #84 of 120 large speakers by sound quality at $249.99.
The case for the JBL Partybox Encore 2: A compact karaoke party speaker with two wireless mics, better balanced sound than the original and a long battery. The catch: It still lacks some upper-bass punch and cannot match the scale of the larger PartyBoxes.
The Marshall Stockwell III is the longer-running, lighter choice. A stylish, rugged speaker with a very long battery you can swap yourself, a detailed app EQ, and power bank charging. It is rated for 40 hours of battery against 15 for the JBL Partybox Encore 2. At 2.9 lbs (1.3 kg) it weighs much less than the JBL Partybox Encore 2 at 14.1 lbs (6.4 kg). It supports AAC Bluetooth, which the JBL Partybox Encore 2 lacks. The tradeoff: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then.
Buy the JBL Partybox Encore 2 at $330 if you want a boombox speaker. Buy the Marshall Stockwell III at $249.99 if you want a large speaker instead.
Want more options? Browse the full Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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
| JBL Partybox Encore 2 | Marshall Stockwell III | |
|---|---|---|
| Price | $330 | $249.99 |
| Ranked | #4 of 113 in Boombox Size Portable Bluetooth Speakers | #84 of 120 in Large Size Portable Bluetooth Speakers |
| App | Yes (JBL PartyBox app) | Yes |
| Aux Input | Yes | Yes |
| Battery Life | 15 hours (Manufacturer specified) | 40+ hours (Manufacturer specified) |
| Built-in Microphone | No | - |
| EQ | Yes (7 band App EQ) | Yes (parametric, via app) |
| IP Rating | IPX4 | IP55 |
| Maximum SPL | 110dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Auracast) | - |
| Power Bank | Yes (USB-C) | Yes |
| Power Input | AC Power cord | USB-C |
| Removable Battery | Yes | - |
| Stereo | Yes | Partially |
| Omnidirectional | No | Yes |
| TWS | Yes | No |
| USB Playback | Yes | - |
| Weight | 14.1 lbs (6.4 kg) | 2.9 lbs (1.3 kg) |
| Wireless Microphones | Yes 2 Included | - |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LE Audio with LC3 |
| Bluetooth Version | 5.4 | 5.3 |
| Amplifier Power | 100W RMS | 44W |
| Dimensions | 12.6” x 13.3” x 10.4” (319.5 x 338.6 x 263 mm) | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) |
| Drivers | 1x 135mm (5.25”) woofer + 2x 20mm (0.75”) dome tweeters | 1x 3” woofer, 2x 1.75” wide-band drivers |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Strap | No | Yes (detachable strap) |
| Bass Extension (-10dB) | 42Hz | - |
| Frequency Response | - | 54Hz - 20kHz (Manufacturer specified) |
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