Most Bluetooth speakers are built for a room. The JBL PartyBox Stage 320 is built for a tennis court, and Prime Day just made it the easiest it has ever been to own one. Amazon has it at $449, against its usual $599, which is an all-time low for this 240W portable party speaker with 18-hour battery life, a built-in lightshow, dual mic and guitar inputs, telescopic handle, and sturdy wheels. No Prime membership required.
240 watts and a lightshow that syncs to the beat
The PartyBox Stage 320 runs two 6.5-inch woofers for deep, precise bass at full volume alongside a pair of 25mm dome tweeters for clean high-frequency detail. JBL rates the combined output at 240W, which is enough to fill an outdoor space the size of a tennis court with music that doesn’t compress or distort when pushed to the top of its range. This is not a speaker you position on a table and stand near: it’s a speaker you place at one end of a backyard, a park, or a venue and let do the work across the entire space.
The built-in lightshow adds starry lights, light trails, and strobe effects that sync automatically to whatever is playing, which transforms the PartyBox Stage 320 from a speaker into a complete audio and visual setup without any additional hardware. The effect is substantial enough that the lightshow alone changes the atmosphere of a space after dark, and it requires nothing more than plugging the speaker in and playing music.
Dual mic inputs and a guitar input let you bring live performance into the mix with karaoke EQ tuning built in, so vocalists and instrumentalists can plug in directly without an external mixer. Auracast wireless connectivity lets you stereo pair two Stage 320 units for a wider soundstage, or link multiple JBL Auracast-enabled PartyBoxes across a larger venue for a completely wireless multi-speaker setup.
18 hours of battery and wheels that actually work
The 18-hour battery life covers an event from setup through last song without a recharge, and a 10-minute fast charge adds another two hours when the battery runs low. The replaceable battery design means you can swap in a fully charged unit mid-event rather than waiting for a recharge, which is a practical feature for back-to-back events that most competing speakers at this size don’t offer. The IPX4 splash-proof rating handles rain and poolside use without issue.
The telescopic handle and wide, sturdy wheels are functional rather than decorative: the Stage 320 weighs enough that moving it without wheels would be a two-person job, and the handle telescopes to a comfortable rolling height so you can navigate it across uneven outdoor surfaces without dragging it. Bluetooth connectivity handles wireless audio from any device, with auxiliary and USB inputs available for wired connections when needed.
Sound system rentals for a backyard event or small venue typically run well above what the PartyBox Stage 320 costs at its all-time low, and a rental doesn’t come home with you afterward. At $449 for 240W, 18 hours, a synchronized lightshow, and wheels, this is the kind of purchase that pays for itself the first time you use it.