JBL isn’t just turning up the volume—it’s cranking the backyard chaos. The new JBL Boombox 4 and PartyBox 720 speakers have landed, promising deeper bass, brighter lights, and enough sound to get your neighbors Googling noise complaints. With AI-powered audio boosts and lighter, more powerful builds, these Bluetooth beasts are built for anyone who thinks “subtle” is a dirty word.
Dropping nearly 2 pounds from its frame, the JBL Boombox 4 now tips the scales at 12.8 lbs (5.8 kg)—but don’t mistake leaner for weaker. This beast cranks out 50% more power on battery, proving it shed the weight just to hit harder.
Portable party speakers are already a massive category for JBL, and the brand just keeps stacking the lineup higher. The new PartyBox 720 slots in as the latest expansion, aimed squarely at poolside DJs, backyard bass junkies, and anyone who thinks “subtle” is a personality flaw.
JBL Boombox 4: Bass Boost and IP68 Rating
The Boombox 4 brings an upgraded Bass Boost with two flavors: Deep Bass for room-shaking lows and Punchy Bass when the playlist leans fast and heavy. Kick it on, and the JBL logos on the radiators light up in white or orange—because nothing says “serious bass” like glowing badges.
Inside, the Boombox 4 ditches its old subwoofer setup for two fresh midrange drivers and a third passive radiator, giving it a more balanced sound across the spectrum. Battery life gets a serious boost too—28 hours standard, or up to 34 with Playtime Boost—and now it’s user-replaceable, meaning this beast won’t be dead weight after a few years.
Add in IP68 waterproofing, dustproofing, and even USB-C lossless audio for wired purists, and it’s ready for anything from the pool to the beach.
JBL Boombox 4 Key Specs
- Audio Power:
- AC mode: 2 x 65W woofers + 2 x 40W tweeters
- Battery mode: 2 x 60W woofers + 2 x 40W tweeters
- Frequency Response: 37 Hz – 20 kHz
- Drivers: 2 x 5″ woofers, 2 x 0.75″ tweeters, 3 passive radiators
- Battery Life: Up to 28 hours (34 hours with Playtime Boost)
- Battery Type: Rechargeable Li-ion, 99 Wh, user-replaceable
- Charge Time: ~3 hours
- Connectivity:
- Bluetooth 5.4 (A2DP 1.4, AVRCP 1.6)
- USB-C (lossless wired playback + powerbank function)
- Auracast + JBL PartyBoost for linking speakers
- Special Features:
- AI Sound Boost for real-time optimized audio
- Dual Bass Boost modes (Deep & Punchy) with glowing JBL logos
- IP68 waterproof + dustproof rating
- Powerbank function for charging devices
- Dimensions / Weight:
- 20″ x 10″ x 8″ (51 x 26 x 21 cm)
- 13 lbs / 5.89 kg
JBL PartyBox 720: Powerful Sound, Party Lights, and Outdoor-Ready Performance
The PartyBox 720 rolls in as JBL’s biggest battery-powered party speaker yet, unleashing 800-watts RMS through dual 9-inch woofers and 30mm dome tweeters—enough to rattle a basketball court. Its new dynamic lightshow flips between starry and strobe effects in sync with your playlist, all fully customizable through the JBL PartyBox app.
Practical touches make it more portable too, with wider wheels, a sturdier handle, and 15 hours of battery life (plus 2 bonus hours from a 10-minute fast charge using dual replaceable batteries).
IPX4 splashproofing keeps it safe from spilled drinks, while Auracast expands the party by linking multiple JBL speakers. Inputs cover everything from USB-C to XLR for mics, guitars, and DJ rigs.
JBL PartyBox 720 Key Specs
- Audio Power: 800 Watts RMS
- Frequency Response: 32 Hz – 20 kHz
- Drivers: 2 x 9-inch woofers, 2 x 1.25-inch dome tweeters
- Battery Life: Up to 15 hours (plus 2 hours from a 10-min fast charge)
- Battery Type: Dual replaceable Li-ion (99 Wh each)
- Charge Time: ~3 hours
- Connectivity:
- Bluetooth 5.4 (A2DP 1.4, AVRCP 1.6)
- USB-C charge out (supports fast charging)
- Aux-in (3.5mm)
- Line-in
- 2 x XLR inputs (mics, guitars, or DJ gear)
- Guitar input
- Special Features:
- Dynamic synced lightshow (customizable via JBL PartyBox app)
- Auracast support for linking multiple speakers
- JBL Original Pro Sound + AI Sound Boost
- Dual mic & guitar inputs for live performances
- IPX4 splashproof
- Dimensions / Weight:
- 37.1″ x 16.4″ x 16″ (94.2 x 41.6 x 40.6 cm)
- 68.3 lbs / 31 kg
- Wider wheels + ergonomic handle for transport
The Bottom Line
The JBL Boombox 4 and PartyBox 720 are unapologetically built for scale—lighter builds, smarter AI-powered audio, user-replaceable batteries, and full waterproofing/splashproofing mean JBL isn’t just chasing volume, it’s chasing longevity and versatility. With competition heating up from Sony, Tronsmart, and Soundcore, JBL’s edge comes down to execution: refined engineering, ecosystem features like Auracast and PartyBoost, and a reputation for pushing drivers harder without the distortion. If you want the tech that backs up the noise, JBL still knows how to run the party.
Price & Availability:
The JBL PartyBox 720 is up for pre-sale now at $1,099 with a global release set for September 21, 2025. Or consider the PartyBox 520 if looking for something smaller and less expensive, $879 at Amazon
The JBL Boombox 4 drops September 28th for $549.95 at Amazon in black, blue, or squad camo. However, the previous generation Boombox 3 may be a better deal until sold out, currently $399 at Amazon.
Related Reading:
- Klipsch Wants You To Crank It Up With Their Music City Series Party Speakers: CES 2025
- DAS BOOM: Soundcore Boom 3i Surfaces As The U-Boat Of Budget Waterproof Bass Cannons
- Tronsmart Halo 300: The Underdog Party Speaker — Does It Make Sense Over Sony And JBL’s Options In 2025?
- JBL’s PartyBox Speakers Aim To Keep Your Party Going All Night Long: CES 2024
