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JBL PartyBox 300 Review

Are you looking for a party speaker with a variety of uses but still a punchy base? The JBL PartyBox 300, which offers guitar and microphone inputs for those karaoke weekends, might be exactly what you’re looking for. Use the Bluetooth connection on your tablet and smartphone to stream music, or connect your portable hard drive to play your downloaded mixtape. In the end, the JBL PartyBox 300 is prepared to deliver if you’re looking for a portable speaker that can tremble the earth’s surface and power your upcoming party!

InputsUSB, RCA, Aux, Mic/Guitar
OutputsRCA L/R
Wireless ConnectivityBluetooth
Transducers2 x 6.25 woofers and 3 x 2.25 tweeters
Frequency Response45Hz to 20 kHz
Battery Life18 hours
Charging Time5 hours
Dimensions27.1″ x 12.2″ x 12.5″
Weight35 lbs


  • separate volume controls for the guitar and microphone inputs.
  • Use the speaker’s built-in Lithium-ion 10.000mAh battery or the 12V DC output of your car to get about 18 hours of playback time.
  • There are three different LED light modes: pulse, meter, and party mode.
  • ‘Bass boost’ button that produces astounding bass.
  • To easily stream music, connect your flash drive to the USB port.
  • You don’t need to worry about bringing an extra charger because the USB port also allows you to charge other devices right from the speaker.
  • The JBL PartyBox 300’s True Wireless Stereo functionality enables you to pair a second compatible speaker with it via Bluetooth or a wired RCA output.


The JBL PartyBox 300 is a piece of technology with a very contemporary appearance that fits easily in your living room. Moving the device around the house or wherever you are feels very secure and rugged. The speaker is enormous, measuring 27 by 12 by 12 inches in all three dimensions. It can be used either horizontally or vertically and weighs about 35 pounds. It has a built-in handle and rubber feet on the side panels and bottom. It is easiest to use when vertical because the top panel is lined with controls, but it can be turned on its side if necessary.

The buttons on top include a standard power button, a bass boost button, a volume control, play/pause, and lighting effects. The front of the speaker, which is protected by a metallic grille panel, has a dual 6.5-inch woofer and three 2.25-inch tweeters for a loud sound. Additionally, they are pre-programmed to change the LED light effects, which can be adjusted to various profiles and turned off with the touch of a button.

Three moods are available on the LED profiles: pulse, meter, and party mode. There are various strobe light settings and patterns available depending on these moods. JBL has also discovered a really inventive way to display the volume level through the LEDs in addition to the lighting effects, which is a really nice feature since ordinarily, you would need to estimate how much the volume needs to be adjusted. Keep the device inside or out of the rain if possible because it is neither splash-proof nor waterproof.


As with many Bluetooth speakers, you can play music from your phone or tablet, or you can check out the inputs and outputs on the back for additional connective possibilities. The DC input, USB input and output, 3.5mm AUX input, L/R channel switch, RC input and output, 100-240V power cord input, and two 1/4″ input jacks—one for microphones and the other for guitars—are all located at the back of the device. You should be aware that if you want to use an XLR microphone, you will need an adapter because the inputs are a quarter-inch.

jbl partybox 300 Connections

You can connect a CD player or a turntable with an amp using the RCA input. The USB port enables you to plug in flash drives so that visitors can choose their preferred music without using a smartphone to connect. There are controls above the microphone and guitar inputs that let you change the volumes separately. Therefore, the JBL PartyBox 300 is the ideal karaoke machine for playing or singing along to music that is already playing through it. To enjoy even more bass at bigger events, you can also connect two PartyBox speakers together via Bluetooth or the RC cable.


A built-in rechargeable Lithium-ion 74.88Wh battery (equivalent to 7.2V 1040mAh) powers the JBL PartyBox 300. It charges in about 5 hours and has an 18-hour playback time. The playtime will vary based on LED usage and volume levels, so if you’re blasting it loudly and utilizing the “party mode” in LED profiles, expect a shorter playtime. Additionally, the PartyBox 300 has a detachable AC power cord that is included, allowing you to continuously run the light and sound show. Your smartphone or tablet can be docked at the speaker’s USB port to be charged.

Sound Quality

Frequency is expressed as a range, such as 100 Hz to 10,000 Hz, and is measured in Hertz. The speaker’s chances of reproducing audio as it was intended to be heard are better the wider the range. However, a wider range does not always imply better sound because it also depends on how each person’s ears perceive sound, which varies. While vocals and other instruments like a guitar typically have frequencies in the range of 250Hz to 4000Hz, the bass in an audio track is typically heard between 20Hz and 250Hz. The JBL PartyBox 300’s remaining frequencies up to 20,000Hz make up the treble.

Therefore, a crucial component of any audio device is sound quality. The PartyBox 300’s volume controls work in conjunction with the master volume of a paired mobile device or tablet, like the majority of Bluetooth speakers. The speaker’s 45Hz to 20kHz frequency response is excellent; the high frequencies are lively, the middle frequencies are distinct, and the bass is very full. Additionally, if the “bass boost” is turned on, the ground you are standing on will actually shake. Using the speaker’s bass-focused capabilities, music genres like hip-hop, rock, and electronic dance music (EDM) sound especially good.

The PartyBox has excellent clarity, so the music will never sound muddy or distorted. Regarding the speaker’s “loudness,” it produces a thunderous 120-watt RMS, which is a lot. To put its volume into perspective, if you were listening to the speaker at home while enjoying music or a movie, you hardly ever needed to turn it up past 30%. Anything higher would likely be used in larger, more noisy environments where the sound would need to travel.


The JBL PartyBox 300 costs $449.95 as of the writing of this article; this price may be affordable to some people while being costly to others. However, given that this speaker is ideal for all situations, including home music listening, parties, and serving as a portable sound system from a car trunk, you’re undoubtedly getting your money’s worth.

jbl partybox 300

What You Will Recieve

  • The JBL PartyBox 300
  • AC Power Cord
  • 12 DC Cable
  • Quick-Start Guide
  • Safety Sheet
  • Warranty card

A heavy-duty vehicle charging cable and two accessories, a power cable and audio cables, are included with the PartyBox 300. The PartyBox, as was already mentioned, weighs a hefty 35 pounds and has handles built right in. Sometimes it’s difficult to comprehend how this speaker is portable given its internal battery. Therefore, a solution would be a set of wheels that could be detached to make moving around simpler.


Anyone looking for a portable party speaker should consider the PartyBox 300 speaker. It will last for a long time thanks to its svelte appearance and robust design. Without distorting the music, the speaker is capable of producing insanely high volumes of bass and sound. For karaoke nights and using it as an amp, its mic and guitar inputs are fantastic. Up to 18 hours of playtime are possible with the huge 10.000mAh battery, which also lets you charge other USB-connected devices. Additionally, it is eye-catching and a spectacle for all of your nighttime adventures thanks to its various LED modes and light features.

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