Mascom International stocks the JBL Xtreme 4 at KSh 31,000, brand new and sealed, with up to 24 hours of battery, six more hours through Playtime Boost, IP67 protection and Auracast linking. The JBL Xtreme 4 drives two woofers and two tweeters for 100W RMS in total when plugged in, and AI Sound Boost reshapes the sound in real time so bass holds up at high volume. It charges over USB-C, works as a powerbank, and its battery can be swapped out later. Pick up the JBL Xtreme 4 at our shop on Kimathi Street, Old Mutual Building, First Floor Room 4, Nairobi CBD.
Built for university students, field engineers, NGO field staff and anyone who moves between places, the JBL Xtreme 4 handles the gap between a pocket speaker and a heavy party unit. Small speakers sound thin once more than five people gather, while bigger models are a burden on a matatu or a long walk. At 2.1kg with a shoulder strap, the JBL Xtreme 4 travels like a bag and still covers a hostel common room, a team-building camp in Naivasha or a staff party in Industrial Area. Its IP67 seal shrugs off dust, rain and the occasional spilled soda.
Where most Nairobi electronics shops sell speakers sealed and unheard, Mascom International opens a demo unit so you can play your own songs on the JBL Xtreme 4 at full volume. At Mascom International, we're seeing buyers pick this model as the middle ground: bigger sound than a Charge-sized speaker without Boombox weight or Boombox prices. Every JBL Xtreme 4 we sell is genuine, sealed and backed by our warranty. Visit us in Nairobi CBD, or order on WhatsApp and pay when the speaker reaches your door.
Common Questions About the JBL Xtreme 4
How much is the JBL Xtreme 4 in Kenya?
The JBL Xtreme 4 costs KSh 31,000 brand new and sealed at Mascom International, Kimathi Street, Nairobi CBD. That covers the speaker, a USB-C charging cable, the shoulder strap and a 12-month warranty against manufacturing defects. Delivery is pay-on-arrival anywhere in Kenya, by cash or M-Pesa, so you check the sealed box before money changes hands. If you want the newer generation, the JBL Xtreme 5 sits KSh 11,000 higher at KSh 42,000, while the smaller JBL Charge 6 costs KSh 18,000, KSh 13,000 less.
JBL Xtreme 4 or JBL Charge 6: which should I buy?
Choose the JBL Xtreme 4 if you want more volume and fuller bass for groups; choose the JBL Charge 6 if you value a smaller, lighter speaker that fits a backpack side pocket. The JBL Xtreme 4 runs two woofers and two tweeters, so it fills a hall or a garden that would stretch the JBL Charge 6. It is bigger, so it comes with a strap. Both support Auracast and AI Sound Boost, so they link together. For solo listening or cycling trips, the JBL Charge 6 saves KSh 13,000.
How do I charge the JBL Xtreme 4 during KPLC power cuts?
The JBL Xtreme 4 charges over USB-C, so any good USB-C wall adapter, a laptop port or a large power bank can top it up during a KPLC outage. JBL quotes about 3.5 hours for a full charge, and the speaker supports speed charging with a suitable adapter. No wall adapter comes in the box, so use your phone's USB-C charger or buy one at Mascom International. Kenyan three-pin sockets accept standard UK-style adapters without any converter.
What does AI Sound Boost do on the JBL Xtreme 4?
AI Sound Boost on the JBL Xtreme 4 analyses the music signal as it plays and adjusts the drivers to keep bass full without distortion. Older speakers often cut bass sharply at high volume to protect themselves, which makes songs sound flat outdoors. Here the processing shapes the output instead, so the low end stays present when you turn it up. It works automatically in the background, and you can still adjust the equaliser in the JBL Portable app.
Can the JBL Xtreme 4 battery be replaced when it wears out?
Yes, the JBL Xtreme 4 has a replaceable battery, sold separately by JBL, so an ageing cell does not mean throwing away the whole speaker. Lithium batteries lose capacity after years of daily charging, especially in hot rooms or car boots. A swap restores the original playtime and extends the speaker's life well beyond a typical portable. Ask our team at Mascom International about sourcing a replacement battery when the time comes. Until then, avoid leaving the speaker charging in direct sun, which slows that wear.
How long does the JBL Xtreme 4 play on one charge?
The JBL Xtreme 4 plays for up to 24 hours on a full charge, and Playtime Boost adds up to six more hours. Playtime Boost trims power use to stretch the battery, which suits a long camping trip in Hell's Gate or a full day at a university sports event. Playing loud with heavy bass shortens the figure. The built-in powerbank can also lend charge to a phone, though that draws down the speaker's own reserve.
Will the JBL Xtreme 4 connect to my other JBL speakers?
The JBL Xtreme 4 links with other Auracast-capable JBL speakers, such as the JBL Charge 6, JBL Flip 7 and JBL Go 4, for stereo or multi-speaker playback. It does not link with older PartyBoost models such as the JBL Charge 5, because the two systems are not compatible. Multi-point Bluetooth also lets two phones stay connected at once, so friends can take turns choosing songs without re-pairing every time. Bring your current speaker to Mascom International and we will test the link for you before you buy.
Who should buy the JBL Xtreme 4, and who should skip it?
Buy the JBL Xtreme 4 if you want group-level sound that still travels on one shoulder, for students, outdoor clubs and small office events. Skip it if you need a speaker for a crowd of a hundred or more; the JBL Boombox 3 at KSh 50,000 handles that better. Karaoke fans should skip it too, since it has no microphone input; the JBL PartyBox Encore Essential 2 at KSh 38,000 suits singing nights. For a pocket speaker, the JBL Go 4 costs KSh 5,700.
Technical Specifications
Audio Hardware
- Two woofers and two tweeters — woofers move the bass and mids, tweeters handle the highs, so vocals stay clear above the beat.
- 100W RMS total on AC power — 30W to each woofer and 20W to each tweeter when the speaker is plugged into a charger.
- 70W RMS total on battery — 20W to each woofer and 15W to each tweeter, still enough for a lively room away from sockets.
- 44Hz to 20kHz frequency response — the span of tones it reproduces, from deep kick drums up to bright cymbals.
- AI Sound Boost — real-time processing that keeps bass full at high volume instead of cutting it to protect the drivers.
Wireless Connectivity
- Bluetooth 5.3 — the current Bluetooth standard, giving a stable link to phones, tablets and laptops across a garden or hall.
- Auracast multi-speaker — links with other Auracast JBL speakers for a stereo pair or a whole group playing in sync.
- Multi-point connection — two phones stay paired at once, so a second person can play the next song without re-pairing.
- JBL Portable app — free on Android and iOS, offering an equaliser, firmware updates and Auracast setup from your phone.
- Works with any Bluetooth phone — Android handsets, iPhones and Windows laptops all play to it without installing extra software first.
- No Wi-Fi needed — everything runs over Bluetooth, so it plays the same way on a mountain trail as in a city flat.
Battery
- Up to 24 hours of playtime — a full day of moderate-volume listening before you need a charger.
- Playtime Boost adds up to 6 hours — a battery-saving mode that stretches a trip without a socket to about 30 hours.
- 3.5-hour charging time — JBL's figure for a full refill, and speed charging cuts waiting time with a suitable USB-C adapter.
- Replaceable battery — the cell can be swapped for a new one, sold separately, extending the speaker's useful life by years.
- Built-in powerbank — the speaker shares its charge with your phone through a USB-C cable when you run low far from a socket.
- USB-C charging — the same connector as most current phones, so one cable and one adapter can serve both devices on a trip.
Build and Durability
- IP67 waterproof and dustproof — sealed against dust and able to survive a dunk in water up to 1 metre deep.
- 2.1kg weight — light enough to carry on a shoulder all afternoon, yet weighted enough to sit firmly on a picnic table.
- 29.7 x 14.9 x 14.1cm size — about a school ruler long, so it fits a weekend bag.
- Detachable shoulder strap — clips on and off, so you carry it hands-free on walks and remove it for indoor use.
- Fabric and rubber exterior — tough fabric guards the drivers while rubber ends absorb knocks when the speaker is set down.
Controls and Inputs
- Top-mounted buttons — power, Bluetooth, play and pause, and volume sit along the top for quick reach from any side.
- Auracast button — one press starts linking with nearby Auracast-capable JBL speakers.
- USB-C port — handles charging the speaker and also feeds power out to a phone when used as a powerbank.
- Playtime Boost control — switched on through the JBL Portable app when you need extra hours more than full volume.
- Equaliser settings — the JBL Portable app lets you raise or lower bass, mids and treble to suit the room, then saves your preferred setting.
- Volume buttons — change the level on the speaker itself, independent of the phone, so whoever stands nearest can turn it down quickly.
Package Contents
The JBL Xtreme 4 arrives brand new in a sealed JBL box. Inside are the JBL Xtreme 4 speaker, a USB-C charging cable, the detachable shoulder strap, a quick start guide, and a warranty card with safety sheet. A wall adapter is not included, so charge it with your phone's USB-C adapter or buy a compatible charger, sold separately at Mascom International. The replaceable battery pack is also sold separately by JBL.
Warranty
The JBL Xtreme 4 ships with a 12-month warranty through Mascom International, covering manufacturing defects under normal use. To make a claim, bring the speaker and your receipt to our Nairobi CBD service desk at Old Mutual Building, Kimathi Street, and our staff will process it for you.
Where to Buy the JBL Xtreme 4 in Kenya
The JBL Xtreme 4 is available to test and buy at Mascom International, Old Mutual Building, First Floor Room 4, Kimathi Street, Nairobi CBD. Our doors are open Monday through Saturday, 9:00 AM to 7:00 PM. Stop by, pair your phone and compare it side by side with the JBL Charge 6 and JBL Xtreme 5 before choosing. JBL sells it in Black, Blue and Camo, so check which colours are in stock with us on WhatsApp.
Reach Mascom International through:
- Phone/WhatsApp: +254 708 852 521
- Email: info@mascomintl.com
- Website: www.mascomintl.com
All 47 counties get pay-on-arrival delivery. Nairobi and its environs receive orders the same day, while Eldoret, Kakamega, Nanyuki, Malindi and other major towns get theirs the next business day. Mandera, Wajir, Marsabit, Lamu, Tana River, and Turkana receive delivery within 2-3 business days. The speaker is backed by the 12-month warranty set out above.
Our promise is simple: specifications you can trust, prices that match what you pay at the counter, and a team that answers after the sale.
