JBL Partybox 310 vs Zealot PT21

Last updated: October 1, 2026

Short answer: the JBL Partybox 310 for sound, the Zealot PT21 for karaoke. The 310 has the deepest bass of any battery powered speaker and the most balanced sound in its class, with a handle and wheels, but it is very large. The PT21 packs dual 166mm woofers, 200W output, a bundled wireless microphone and echo in a lighter, more compact body than the ZE41, though app EQ support is incomplete and IPX5 handles splashes but not submersion.

JBL Partybox 310 vs Zealot PT21

Buy the Zealot PT21 new; the JBL Partybox 310 is no longer sold new, so it only makes sense as a used find.

Want more options? Browse the full Portable Bluetooth rankings.

Buy the Zealot PT21 at AliExpress ($225.86) →Buy the JBL Partybox 310 at Amazon ($449.95) →

Specifications Side By Side

JBL Partybox 310 Zealot PT21
Price$449.95 Discontinued$225.86
Ranked#4 of 43 in Party Size Portable Bluetooth Speakers#12 of 43 in Party Size Portable Bluetooth Speakers
AppYesNo
Aux InputYesYes
Bass Extension (-10dB)32Hz-
Battery Life18 hours (Manufacturer specified)60 hours (Manufacturer specified)
BluetoothYesYes
Bluetooth CodecsSBCSBC (inferred; additional codecs unverified)
Charging Time3.5 hours-
EQYes (3 band)Yes (Bass, Voice, Standard modes)
Guitar InputYes-
IP RatingIPX4IPX5
Microphone InputYes (Karaoke mode with echo effect)Yes (Karaoke mode with echo effect)
Party ModeNoYes (PartyAdd up to 100 speakers)
Power BankYes (USB-A, 5V/2.1A)Yes (USB-A)
Power InputAC Power cordType-C
StereoPartiallyYes
OmnidirectionalNoNo
TWSYesYes
USB PlaybackYesYes
Weight37.5 lbs (17 kg)20.7 lbs (9.4 kg)
Amplifier Power240W200W
Drivers2x 6.5” (165mm) woofers + 2x 2.5” (65mm) tweeters2x 166mm woofers + tweeters + midrange drivers
Digital Aux InputNoNo
LightsYesYes
WheelsYes-
Dimensions27.1”H x 12.8”W x 14.5”D (687.7 x 325.6 x 367.8 mm)21.1” x 8.6” x 11.9” (535 x 219 x 303 mm)
Bluetooth Version5.15.3
StrapNo-
Battery Capacity-48000mAh (12x4000mAh)
Frequency Response-20Hz - 20kHz (Manufacturer specified)
MicroSD Playback-Yes
Buy the Zealot PT21 at AliExpress ($225.86) →Buy the JBL Partybox 310 at Amazon ($449.95) →

More top alternatives to JBL Partybox 310:

Prices on this page were last checked October 2, 2026 at 10:18 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 310: $449.95 Discontinued Amazon eBay

JBL Partybox 310 ranking card

Newer model: the JBL Partybox 330, ranked higher, rated 4.6/5.

Pros: Absolute deepest bass of any battery powered speaker, most balanced sound in the class, handle and wheels are convenient. Increase treble one step in the app EQ to make it more neutral. Customizable color lighting modes. Very close to the JBL Partybox Stage 320 in terms of performance. Measured bass extension of 32Hz (-10dB).

Cons: Very large. Discontinued.

Full JBL Partybox 310 review and specifications →

Amplifier Power240W
AppYes
Aux InputYes
Bass Extension (-10dB)32Hz
Battery Life18 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsSBC
Bluetooth Version5.1
Charging Time3.5 hours
Digital Aux InputNo
Dimensions27.1”H x 12.8”W x 14.5”D (687.7 x 325.6 x 367.8 mm)
Drivers2x 6.5” (165mm) woofers + 2x 2.5” (65mm) tweeters
EQYes (3 band)
Guitar InputYes
IP RatingIPX4
LightsYes
Microphone InputYes (Karaoke mode with echo effect)
OmnidirectionalNo
Party ModeNo
Power BankYes (USB-A, 5V/2.1A)
Power InputAC Power cord
StereoPartially
StrapNo
TWSYes
USB PlaybackYes
Weight37.5 lbs (17 kg)
WheelsYes
Check current price at Amazon ($449.95) →Search eBay for JBL Partybox 310 →

Zealot PT21: $225.86 AliExpress eBay

Zealot PT21 ranking card

Pros: Dual 166mm woofers and 200W output in a lighter, more compact body than the ZE41, with a bundled wireless microphone and echo effect built in for karaoke. Quite deep bass for the price, even deeper than the JBL Boombox 4 in direct comparisons.

Cons: Unlike some other Zealot models, app-based EQ customization doesn’t appear to be fully supported yet, and IPX5 means it can handle splashes but not submersion.

Full Zealot PT21 review and specifications →

Amplifier Power200W
AppNo
Aux InputYes
Battery Capacity48000mAh (12x4000mAh)
Battery Life60 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsSBC (inferred; additional codecs unverified)
Bluetooth Version5.3
Digital Aux InputNo
Dimensions21.1” x 8.6” x 11.9” (535 x 219 x 303 mm)
Drivers2x 166mm woofers + tweeters + midrange drivers
EQYes (Bass, Voice, Standard modes)
Frequency Response20Hz - 20kHz (Manufacturer specified)
IP RatingIPX5
LightsYes
MicroSD PlaybackYes
Microphone InputYes (Karaoke mode with echo effect)
OmnidirectionalNo
Party ModeYes (PartyAdd up to 100 speakers)
Power BankYes (USB-A)
Power InputType-C
StereoYes
TWSYes
USB PlaybackYes
Weight20.7 lbs (9.4 kg)
Check current price at AliExpress ($225.86) →Search eBay for Zealot PT21 →