Short answer: the JBL Partybox Encore Essential 2 for off axis sound, the Marshall Stockwell II for natural tone. The Essential 2’s dome tweeters over cone appear to give better off axis performance, though it is missing a little bit of upper bass. The Stockwell II is possibly the most natural sounding Marshall speaker, but it is not stereo.

Buy the JBL Partybox Encore Essential 2 at $249.95 if you want a boombox speaker. Buy the Marshall Stockwell II at $229.99 if you want a large speaker instead.
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Specifications Side By Side
| JBL Partybox Encore Essential 2 | Marshall Stockwell II | |
|---|---|---|
| Price | $249.95 | $229.99 |
| Ranked | #6 of 113 in Boombox Size Portable Bluetooth Speakers | #11 of 120 in Large Size Portable Bluetooth Speakers |
| App | Yes (JBL PartyBox app) | No |
| Aux Input | Yes | Yes |
| Battery Life | 15 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Built-in Microphone | No | Yes |
| EQ | Yes (7 band App EQ) | No |
| Guitar Input | Yes | - |
| IP Rating | IPX4 | IPX4 |
| Microphone Input | Yes (Karaoke mode with echo effect) | - |
| Party Mode | Yes (Auracast) | No |
| Power Bank | Yes (USB-C) | No |
| Power Input | AC Power cord | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | Yes |
| TWS | Yes | No |
| USB Playback | Yes | - |
| Weight | 13.7 lbs (6.2 kg) | 3.1 lbs (1.4 kg) |
| Wireless Microphones | No | - |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Bluetooth Version | 5.4 | 5.0 |
| Amplifier Power | 100W RMS | 20W |
| Dimensions | 12.6” x 13.5” x 10.3” (319.5 x 342 x 260.4 mm) | 7.1” x 6.3” x 2.8” (180 x 161 x 70 mm) |
| Drivers | 1x 135mm (5.25”) woofer + 2x 20mm (0.75”) dome tweeters | 3” woofer, 2x 2” fullrange tweeters |
| Maximum SPL | 110dB (measured by Alan Ross Reviews) | 96dB (measured by Alan Ross Reviews) |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Strap | No | Yes (built-in strap) |
| Bass Extension (-10dB) | 42Hz | 44Hz |
| Bluetooth Latency | - | 50ms |
| Frequency Response | - | 60Hz - 20kHz (Manufacturer specified) |
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