These are not really the same size class, and that is the honest framing here. The JBL Boombox 3 Wifi ranks #26 of 91 boombox speakers by sound quality at $389.95; the Marshall Kilburn III ranks #42 of 103 large speakers by sound quality at $379.99.
The JBL Boombox 3 Wifi is the tougher choice. Loudest speaker in the category. It is rated IP67 against IP54 for the Marshall Kilburn III. The catch: Bass boosted.
The Marshall Kilburn III is the longer-running, lighter option. Spacious soundstage with broad stereo dispersion from Marshall’s True Stereophonic multi-driver layout, delivering warm, room-filling sound with 45Hz bass extension. It is rated for 50 hours of battery against 24 for the JBL Boombox 3 Wifi. At 6.3 lbs (2.85 kg) it weighs much less than the JBL Boombox 3 Wifi at 14.6 lbs (6.6 kg). It supports AAC Bluetooth, which the JBL Boombox 3 Wifi lacks. Watch for: Noticeable dips in the midrange compromise frequency response neutrality, making vocals and acoustic instruments sound somewhat recessed or muffled compared to more linear competitors like the JBL Xtreme 4 unless the bass dial is dialed back.
Buy the JBL Boombox 3 Wifi at $389.95 for a boombox speaker, or the Marshall Kilburn III at $379.99 for a large speaker instead.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| JBL Boombox 3 Wifi | Marshall Kilburn III | |
|---|---|---|
| Price | $389.95 | $379.99 |
| Ranked | #26 of 91 in Boombox Size Portable Bluetooth Speakers | #42 of 103 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 43Hz | 45Hz |
| Battery Life | 24 hours (Manufacturer specified) | 50 hours (Manufacturer specified) |
| IP Rating | IP67 | IP54 |
| Maximum SPL | 111dB (measured by Alan Ross Reviews) | 91dB |
| Party Mode | No | Yes (Auracast) |
| Power Bank | Yes (USB-A, 5V/2A) | Yes |
| Power Input | AC Power cable | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 14.6 lbs (6.6 kg) | 6.3 lbs (2.85 kg) |
| Wi-Fi | Yes | - |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC |
| App | No | Yes |
| EQ | No | Yes |
| USB Playback | No | - |
| Built-in Microphone | No | No |
| Amplifier Power | 200W AC / 140W battery | 50W |
| Dimensions | 19.1” x 10.1” x 7.9” (484 x 256 x 200 mm) | 10.7” x 5.9” x 6.7” (272 x 150 x 170 mm) |
| Drivers | 1x 189mm subwoofer + 2x 81mm woofers + 2x 20mm tweeters | 1x 4” woofer + 2x 2” full-range drivers |
| Digital Aux Input | No | No |
| Bluetooth Version | 5.3 | 5.3 |
| Strap | No | Yes (built-in strap) |
| Frequency Response | - | 45Hz - 20kHz |
Watch Them Compared
Videos and reviews that test both speakers side by side.
Related Speaker Comparisons
How JBL Boombox 3 Wifi compares with other leading options:
- EarFun Uboom X vs JBL Boombox 3 Wifi
- JBL Boombox 3 Wifi vs Tribit Stormbox Blast
- Harman Kardon Go + Play 3 vs JBL Boombox 3 Wifi
- JBL Boombox 3 Wifi vs JBL Partybox Encore 2
- JBL PartyBox On-The-Go 2 Plus vs JBL Boombox 3 Wifi
Prices on this page were last checked October 10, 2026 at 5:37 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
JBL Boombox 3 Wifi: $389.95 Amazon eBay
Newer model: the JBL Boombox 4, ranked higher, rated 4/5, released Jul 2025. It adds USB audio input, app control, adjustable EQ and party mode, but drops the aux input. Water resistance goes from IP67 to IP68. See every JBL Boombox generation.
Same family: the JBL Boombox 3 (smaller model, ranked lower, rated 3.8/5).
Pros: Loudest speaker in the category. Slightly better frequency response than the non-wifi version. Measured bass extension of 43Hz (-10dB).
Cons: Bass boosted. Dip at 160Hz
Full JBL Boombox 3 Wifi review and specifications →
| Released | May 2023 (3 years ago) |
|---|---|
| Amplifier Power | 200W AC / 140W battery |
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 43Hz |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 19.1” x 10.1” x 7.9” (484 x 256 x 200 mm) |
| Drivers | 1x 189mm subwoofer + 2x 81mm woofers + 2x 20mm tweeters |
| EQ | No |
| IP Rating | IP67 |
| Maximum SPL | 111dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A, 5V/2A) |
| Power Input | AC Power cable |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| USB Playback | No |
| Weight | 14.6 lbs (6.6 kg) |
| Wi-Fi | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Dominik Reviews: JBL Partybox Encore 2 vs JBL Boombox 3 WiFi - Sound Test - Wide vs Narrow Soundstage! More from Dominik Reviews →
- Mateusz Cholewa: JBL Encore 2 Partybox Deep Bass 🆚 Jbl Boombox 3 WiFi 🎶 More from Mateusz Cholewa →
- Alan Ross Reviews: Not quite! JBL Authentics 300 review and sound test vs Boombox 3, Encore and Stormbox Blast More from alanrossreviews →
- Alan Ross Reviews: WiFi Edition: JBL Boombox 3 ultimate review! vs Boombox 3 Bluetooth edition
- Mateusz Cholewa: Soundcore Rave 3🧐 🆚 Jbl Boombox 3 WiFi
- Mateusz Cholewa: Marshall Kilburn 3 vs Jbl Boombox 3 WiFi Czy to najlepszy Boombox? - Który lepszy w muzyce ROCK?
- Josh’s Gadgets and More: JBL Boombox 3 Wifi vs Ruimatech RM-10
- Josh’s Gadgets and More: JBL Boombox 3 WiFi vs ONN Pro X-Large Boombox Sound Comparison
- Head-to-Head Comparisons
- JBL Boombox 3 Wifi vs JBL Boombox 3
- JBL Boombox 3 Wifi vs Harman Kardon Onyx Studio 5
- JBL Boombox 3 Wifi vs Bugani Brief Pro
- JBL Boombox 3 Wifi vs Harman Kardon Go + Play 2
- JBL Boombox 3 Wifi vs Ruimatech RM-10
- JBL Boombox 3 Wifi vs Hopestar A90
- JBL Boombox 3 Wifi vs W-King X20S
- JBL Boombox 3 Wifi vs Tribit Stormbox Blast 2
- See all 85 comparisons
Marshall Kilburn III: $379.99 Amazon eBay
Older model: the Marshall Kilburn II (ranked lower, rated 3.8/5). See every Marshall Portable Speakers generation.
Same family: the Marshall Willen II (smaller model, rated 4/5), the Marshall Emberton III (smaller model, rated 2.7/5), the Marshall Middleton II (smaller model, ranked higher, rated 4.1/5) and the Marshall Stockwell III (smaller model, ranked lower, rated 3/5).
Pros: Spacious soundstage with broad stereo dispersion from Marshall’s True Stereophonic multi-driver layout, delivering warm, room-filling sound with 45Hz bass extension. Independent physical bass and treble dials allow quick tonal adjustments on the fly, backed by app-based EQ and placement compensation. Battery life is outstanding at up to 50+ hours with USB-C power-bank charging, IP54 splash resistance, 3.5mm aux input, and Bluetooth 5.3 with Auracast broadcast support. Measured bass extension of 45Hz (-10dB).
Cons: Noticeable dips in the midrange compromise frequency response neutrality, making vocals and acoustic instruments sound somewhat recessed or muffled compared to more linear competitors like the JBL Xtreme 4 unless the bass dial is dialed back. The Marshall Kilburn II retains slightly punchier perceived loudness at maximum volume due to a more aggressive V-shaped contour. At 2.85 kg with only IP54 splash resistance, it is heavy and cannot withstand water immersion. Lacks a built-in microphone and LDAC codec support.
Full Marshall Kilburn III review and specifications →
| Released | May 2025 (1 year ago) |
|---|---|
| Amplifier Power | 50W |
| App | Yes |
| Aux Input | Yes |
| Bass Extension (-10dB) | 45Hz |
| Battery Life | 50 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 10.7” x 5.9” x 6.7” (272 x 150 x 170 mm) |
| Drivers | 1x 4” woofer + 2x 2” full-range drivers |
| EQ | Yes |
| Frequency Response | 45Hz - 20kHz |
| IP Rating | IP54 |
| Maximum SPL | 91dB |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in strap) |
| TWS | Yes |
| Weight | 6.3 lbs (2.85 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Mateusz Cholewa: Marshall Kilburn 3 vs Marshall Middleton 2 Opinion in Subtitles More from Mateusz Cholewa →
- Mateusz Cholewa: Marshall Kilburn 3 vs Marshall Middleton
- Mateusz Cholewa: Marshall Kilburn 3 vs Marshall Kilburn 2
- Mateusz Cholewa: New 2025😎 Marshall Kilburn 3 UNBOXING 📦Audio TEST vs Kilburn 2
- Mateusz Cholewa: Marshall Kilburn 3 vs Jbl Boombox 3 WiFi Czy to najlepszy Boombox? - Który lepszy w muzyce ROCK?
- Mateusz Cholewa: Marshall Kilburn 3 DEEP BASS👌💪💖🆚 Marshall Kilburn 2 Outside
- Mateusz Cholewa: MARSHALL Kilburn 3 vs SONY ULT Field 5
- Mateusz Cholewa: Marshall Kilburn 3 vs JBL Xtreme 4 – OUTSIDE🤗
- Mateusz Cholewa: Marshall Kilburn 3 Deep Bass vs Tribit Stormbox Lava Deep Bass
- Storytripper HD: Marshall Kilburn III vs JBL Xtreme 5 (Verion Outdoor) More from storytripperhd →
- Mateusz Cholewa: Marshall Kilburn 3 DEEP BASS 💪vs HK Go Plus Play 3 DEEP BASS❤❤❤
- Mateusz Cholewa: Marshall Kilburn 3 vs EarFun UBOOM X
- Mateusz Cholewa: MARSHALL Kilburn 3 🆚 JBL Xtreme 4
- What Hi-Fi?: Marshall Kilburn III review
- RTINGS: Marshall Kilburn III Speaker Review More from Rtings.com →
- Head-to-Head Comparisons
- Marshall Kilburn III vs Marshall Kilburn II
- Marshall Kilburn III vs JBL Xtreme 4
- Marshall Kilburn III vs Marshall Middleton
- Marshall Kilburn III vs Marshall Middleton II
- Marshall Kilburn III vs Sony ULT Field 5
- Marshall Kilburn III vs Tribit Stormbox Lava
- Marshall Kilburn III vs JBL Xtreme 5
- Marshall Kilburn III vs EarFun Uboom X
- See all 9 comparisons