JBL Boombox 4 vs Zealot S89

Last updated: September 23, 2026

Short answer: the Zealot S89. It ranks #18 of 75 boombox speakers against the JBL Boombox 4’s #19, and it costs far less to get there.

JBL Boombox 4 vs Zealot S89

The S89’s value proposition is specific: bass, runtime, and volume. Our notes call it a great value for bass performance, play time, and max volume in the boombox class, and it likely shares internals with the well-regarded Zealot ZE21. Its 250W output tops the Boombox 4’s 210W, its 40-hour battery beats the Boombox 4’s 28 hours, and its -10dB bass extension of 36Hz reaches deeper than the Boombox 4’s 41Hz. The tradeoffs are real too: our notes describe it as a little rolled off up top and not that balanced through the rest of the range, with clarity that isn’t as good as better speakers and a bass EQ that comes across bloated and muddy.

The Boombox 4’s problem is value, not raw ability. Our notes call its output capability pretty insane for the size, but also call it pretty overpriced for the category, noting it actually sounds worse out of the box than the older Boombox 3 until you dial in the 7-band EQ. It also has no aux input, something the S89 does have.

What the Boombox 4 does hold onto: a genuinely tougher IP68 rating against the S89’s IPX6, and a removable battery with USB-C digital aux input the S89 lacks.

Buy the Zealot S89 for the better price-to-performance ratio: deeper bass, longer battery life, and higher output for less money, if you can live with rougher clarity and a muddier bass EQ.

Buy the JBL Boombox 4 only if the extended-submersion IP68 rating or JBL’s ecosystem and app support matter enough to justify the higher price.

Still deciding? The full Portable Bluetooth rankings cover every ranked option.

Buy the Zealot S89 at Amazon ($246.99) →Buy the JBL Boombox 4 at Amazon ($549.95) →

Specifications Side By Side

JBL Boombox 4 Zealot S89
Price$549.95$246.99
Ranked#19 of 75 in Boombox Size Portable Bluetooth Speakers#18 of 75 in Boombox Size Portable Bluetooth Speakers
AppYesNo
Aux InputNoYes
Bass Extension (-10dB)41Hz36Hz
Battery Life28 hours (Manufacturer specified)40 hours (Manufacturer specified)
EQYes (7 band)Yes (multiple modes)
IP RatingIP68IPX6
Bluetooth LatencyAAC 144ms, SBC 48ms-
Maximum SPL115dB (measured by Alan Ross Reviews)-
Party ModeYes (Auracast)Yes (PartyAdd up to 100 speakers)
Power InputAC Power cordUSB-C
Removable BatteryYes-
StereoYesYes
OmnidirectionalNoNo
Weight13.2 lbs (5.98 kg)16.1 lbs (7.3 kg)
Bluetooth CodecsSBC, LC3, AACSBC
Bluetooth Version5.45.3
Built-in MicrophoneNoNo
Power BankYes (USB-C, up to 30W)Yes (USB-A + USB-C)
TWSYesYes
Digital Aux InputYes (USB-C)No
USB PlaybackNoYes
FM TunerNo-
Microphone InputNo-
MicroSD PlaybackNoYes
Amplifier Power210W AC / 200W battery250W
Dimensions20.1" x 10.2" x 8.3" (510 x 260 x 210 mm)21.2" x 10.4" x 9.4" (538 x 265 x 240 mm)
Drivers2x 123mm woofers + 2x 20mm tweeters with passive radiators130W subwoofer + 2x 40mm drivers + 2x tweeters
Buy the Zealot S89 at Amazon ($246.99) →Buy the JBL Boombox 4 at Amazon ($549.95) →

More top alternatives to Zealot S89:

Prices on this page were last checked September 23, 2026 at 11:24 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 4: $549.95 Amazon B&H Photo Video eBay

JBL Boombox 4 ranking card

Pros: Pretty insane output capability for the size. Measured bass extension of 41Hz (-10dB).

Cons: Pretty overpriced for the category. Better than the Boombox 3 mostly because there are more 7 EQ bands instead of just 3 and it can be better tuned. Try Oluv’s EQ for it. Out of the box sounds worse than the Boombox 3. No Aux input.

Full JBL Boombox 4 review and specifications →

Amplifier Power210W AC / 200W battery
AppYes
Aux InputNo
Bass Extension (-10dB)41Hz
Battery Life28 hours (Manufacturer specified)
Bluetooth CodecsSBC, LC3, AAC
Bluetooth LatencyAAC 144ms, SBC 48ms
Bluetooth Version5.4
Built-in MicrophoneNo
Digital Aux InputYes (USB-C)
Dimensions20.1" x 10.2" x 8.3" (510 x 260 x 210 mm)
Drivers2x 123mm woofers + 2x 20mm tweeters with passive radiators
EQYes (7 band)
FM TunerNo
IP RatingIP68
Maximum SPL115dB (measured by Alan Ross Reviews)
MicroSD PlaybackNo
Microphone InputNo
OmnidirectionalNo
Party ModeYes (Auracast)
Power BankYes (USB-C, up to 30W)
Power InputAC Power cord
Removable BatteryYes
StereoYes
TWSYes
USB PlaybackNo
Weight13.2 lbs (5.98 kg)
Check current price at Amazon ($549.95) →Check current price at B&H Photo Video →Search eBay for JBL Boombox 4 →

Zealot S89: $246.99 Amazon Aliexpress eBay

Zealot S89 ranking card

Pros: A 7.3kg boombox with a claimed 36Hz bass extension, 40-hour battery life, IPX6 protection, USB-C charging, aux, USB and microSD playback, TWS and multi-speaker PartyAdd. Listener comparisons find it capable of very high output and substantial bass for outdoor use. Measured bass extension of 36Hz (-10dB).

Cons: At high volume, listener reports describe the bass as loose or muddy and the overall balance as less clear than better boombox speakers. The heavy cabinet and basic finish also make it less polished for daily portability, while its multiple EQ modes cannot substitute for a genuinely neutral tuning.

Full Zealot S89 review and specifications →

Amplifier Power250W
AppNo
Aux InputYes
Bass Extension (-10dB)36Hz
Battery Life40 hours (Manufacturer specified)
Bluetooth CodecsSBC
Bluetooth Version5.3
Built-in MicrophoneNo
Digital Aux InputNo
Dimensions21.2" x 10.4" x 9.4" (538 x 265 x 240 mm)
Drivers130W subwoofer + 2x 40mm drivers + 2x tweeters
EQYes (multiple modes)
IP RatingIPX6
MicroSD PlaybackYes
OmnidirectionalNo
Party ModeYes (PartyAdd up to 100 speakers)
Power BankYes (USB-A + USB-C)
Power InputUSB-C
StereoYes
TWSYes
USB PlaybackYes
Weight16.1 lbs (7.3 kg)
Check current price at Amazon ($246.99) →Check current price at Aliexpress ($193.58) →Search eBay for Zealot S89 →