Short answer: the Marshall Bromley 450, if you are buying new. The JBL Partybox 300 ranks higher than it (#10 vs #24 of 44 party speakers, 4.3/5 vs 3.7/5) but is discontinued, so only consider it used; the Marshall Bromley 450 is still sold new at $649.95.
The JBL Partybox 300 is the better-sounding choice. Exceptional sound quality with crisp, crystal clear highs and midranges, hard punchy bass without muddiness. Watch for: Hard to carry, too tall, drags on the ground.
The Marshall Bromley 450 is the longer-running, lighter choice. A balanced, warm sound with a flat midrange that keeps vocals and instruments clear, plenty of bass rumble and enough treble for energetic vocals, per RTINGS’ lab tests. It is rated for 40 hours of battery against 18 for the JBL Partybox 300. At 27.1 lbs (12.3 kg) it weighs noticeably less than the JBL Partybox 300 at 35.3 lbs (16 kg). It is rated IP55, while the JBL Partybox 300 has no water resistance. The catch: It is the quietest of its rivals: both the Soundboks Mix and Teufel Rockster Air 2 play louder, and near max volume the bass recedes and the sound gets less composed.
Buy the Marshall Bromley 450 new; the JBL Partybox 300 is no longer sold new, so it only makes sense as a used find.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| JBL Partybox 300 | Marshall Bromley 450 | |
|---|---|---|
| Price | $300 Discontinued | $649.95 |
| Ranked | #10 of 44 in Party Size Portable Bluetooth Speakers | #24 of 44 in Party Size Portable Bluetooth Speakers |
| App | No | Yes (Marshall Bluetooth app) |
| Aux Input | Yes | Yes (3.5mm, RCA) |
| Bass Extension (-10dB) | 40Hz | - |
| Battery Life | 18 hours (Manufacturer specified) | 40+ hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LC3 |
| Bluetooth Version | 4.2 | 5.3 |
| Dimensions | 27” x 13” x 12.7” (685.8 x 330.2 x 322.6 mm) | 14.4” x 19.4” x 10.3” (366 x 492 x 261 mm) |
| EQ | No | Yes |
| Frequency Response | 45Hz - 20kHz (Manufacturer specified) | 42Hz - 20kHz (Manufacturer specified) |
| Guitar Input | Yes | Yes |
| IP Rating | None | IP55 |
| Microphone Input | Yes (Karaoke mode with echo effect) | Yes (2x XLR/6.35mm combo) |
| Party Mode | No | Yes (Auracast) |
| Power Bank | Yes (USB-A) | Yes (USB-C) |
| Power Input | AC Power cord | USB-C |
| Stereo | Yes (lying down) | Yes |
| Omnidirectional | No | Yes |
| TWS | Yes | No |
| USB Playback | Yes | No |
| Weight | 35.3 lbs (16 kg) | 27.1 lbs (12.3 kg) |
| Amplifier Power | 120W | 400W |
| Drivers | 2x 6.5” (165mm) woofers + 3x 2.25” (57mm) tweeters | 2x 6.5” woofers, 4x 2” full-range drivers, 2 passive radiators |
| Digital Aux Input | No | Yes (USB-C) |
| Lights | Yes | Yes |
| Strap | No | No |
| Charging Time | - | 3.5 hours |
| Removable Battery | - | Yes |
| XLR Input | - | Yes (2x combo) |
| Built-in Microphone | - | No |
| Wi-Fi | - | No |
| Wheels | - | No |
Related Speaker Comparisons
More worthwhile head-to-heads for JBL Partybox 300:
- Sony ULT Tower 7 vs JBL Partybox 300
- JBL Partybox 330 vs JBL Partybox 300
- JBL Partybox Stage 320 vs JBL Partybox 300
- JBL Partybox 310 vs JBL Partybox 300
- Sony ULT Tower 5 vs JBL Partybox 300
Prices on this page were last checked October 4, 2026 at 9:58 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 Partybox 300: $300 Discontinued eBay
Newer model: the JBL Partybox 330, ranked higher, rated 4.6/5.
Pros: Exceptional sound quality with crisp, crystal clear highs and midranges, hard punchy bass without muddiness. 2x 6.5” woofers + 3x 2.25” tweeters, bass boost function, 45Hz-20kHz frequency range. 18-hour battery with 10400mAh capacity. Multiple inputs (RCA, USB, 3.5mm aux, mic, guitar). LED light modes (meter/pulse/party). True Wireless Stereo pairing up to 2 units. Measured bass extension of 40Hz (-10dB).
Cons: Hard to carry, too tall, drags on the ground. Max spl and bass extension are only as good as the Partybox 100. No real reason to ever get one, get a Partybox 100 instead. Discontinued.
Full JBL Partybox 300 review and specifications →
| Amplifier Power | 120W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 40Hz |
| Battery Life | 18 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.2 |
| Digital Aux Input | No |
| Dimensions | 27” x 13” x 12.7” (685.8 x 330.2 x 322.6 mm) |
| Drivers | 2x 6.5” (165mm) woofers + 3x 2.25” (57mm) tweeters |
| EQ | No |
| Frequency Response | 45Hz - 20kHz (Manufacturer specified) |
| Guitar Input | Yes |
| IP Rating | None |
| Lights | Yes |
| Microphone Input | Yes (Karaoke mode with echo effect) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A) |
| Power Input | AC Power cord |
| Stereo | Yes (lying down) |
| Strap | No |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 35.3 lbs (16 kg) |
- Links
- 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
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Marshall Bromley 450: $649.95 Amazon B&H Photo Video eBay
Pros: A balanced, warm sound with a flat midrange that keeps vocals and instruments clear, plenty of bass rumble and enough treble for energetic vocals, per RTINGS’ lab tests. Drivers on all four sides keep the tonal balance nearly the same from any angle, and M1M Tech Channel found it more open and airy than the Soundboks Mix and Teufel Rockster Air 2, with deeper bass than both. RTINGS measured 18.8 hours of battery from a swappable LiFePO4 pack shared with the Bromley 750, and it adds IP55 protection, two XLR/6.35mm combo inputs, USB-C audio, Auracast and physical bass and treble knobs.
Cons: It is the quietest of its rivals: both the Soundboks Mix and Teufel Rockster Air 2 play louder, and near max volume the bass recedes and the sound gets less composed. The warm tuning lacks some fine treble detail. There is no graphic EQ, only bass and treble knobs, and its stereo spreads left and right channels around the cabinet, so panned elements can land on the wrong side. At 12.3 kg it has a carry handle but no wheels.
Full Marshall Bromley 450 review and specifications →
| Amplifier Power | 400W |
|---|---|
| App | Yes (Marshall Bluetooth app) |
| Aux Input | Yes (3.5mm, RCA) |
| Battery Life | 40+ hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, LC3 |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Charging Time | 3.5 hours |
| Digital Aux Input | Yes (USB-C) |
| Dimensions | 14.4” x 19.4” x 10.3” (366 x 492 x 261 mm) |
| Drivers | 2x 6.5” woofers, 4x 2” full-range drivers, 2 passive radiators |
| EQ | Yes |
| Frequency Response | 42Hz - 20kHz (Manufacturer specified) |
| Guitar Input | Yes |
| IP Rating | IP55 |
| Lights | Yes |
| Microphone Input | Yes (2x XLR/6.35mm combo) |
| Omnidirectional | Yes |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-C) |
| Power Input | USB-C |
| Removable Battery | Yes |
| Stereo | Yes |
| Strap | No |
| TWS | No |
| USB Playback | No |
| Weight | 27.1 lbs (12.3 kg) |
| Wheels | No |
| Wi-Fi | No |
| XLR Input | Yes (2x combo) |
- Links
- Reviews, Comparisons and Sound Samples
- RTINGS: Marshall Bromley 450 Review More from Rtings.com →
- M1M Tech Channel: The best in its class? Marshall Bromley 450 vs. Soundboks & Teufel More from M1MTechChannel →
- HeadphoneCheck: Marshall Bromley 450 test
- Tom’s Guide: Marshall Bromley 450 vs Bromley 750 face-off
- Smart Home Sounds: Marshall Bromley 450 review More from Smart Home Sounds →
- Storytripper HD: JBL Partybox 120 vs Marshall Bromley 450 (Indoor) More from storytripperhd →
- Storytripper HD: Marshall Bromley 450 vs Marshall Bromley 750 (outdoor)
- Storytripper HD: Marshall Woburn III vs Marshall Bromley 450
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- Marshall Bromley 450 vs Soundboks Go
- Marshall Bromley 450 vs Tronsmart Halo 300
- Marshall Bromley 450 vs Onn Large Party gen 2
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