JBL Quantum 300 is in stock at Mascom International, priced at KSh 8,500 for a wired over-ear gaming headset built around 50mm neodymium drivers and a flip-up boom mic. Every unit is brand new and sealed. The JBL Quantum 300 is a hybrid design: its 3.5mm cable plugs into consoles, phones and laptops, while the USB audio adapter in the box unlocks JBL QuantumSURROUND and the JBL QuantumENGINE software on a PC. It weighs 245 grams and rests on memory foam cushions. Try it at our store in the Old Mutual Building, Kimathi Street, Nairobi CBD.
Designed for PC gamers, streamers and developers who play after work, the JBL Quantum 300 answers a frustration many Kenyan players share: a cheap headset that sounds flat and hides where an enemy is coming from. The larger drivers move more air for fuller bass, and on PC the surround processing places sounds around your head instead of only left and right. The mic flips up and out of your way when you are just listening. At Mascom International, we're seeing gamers on Safaricom Home Fibre in Kilimani and Westlands choose the JBL Quantum 300 for ranked nights on PC and weekend sessions on PS5.
Unlike other electronics retailers in Kenya that sell grey-import headsets with no local cover, Mascom International sells the JBL Quantum 300 with a 12-month warranty you claim in person at our Nairobi CBD store. Buyers throughout Kenya report that the USB adapter is the reason they step up from entry wired headsets, since it bypasses a laptop's own headphone jack. Order on WhatsApp for pay-on-arrival delivery, or walk in and compare the JBL Quantum 300 side by side with the other JBL Quantum models on our shelf before you decide.
Common Questions About the JBL Quantum 300
What is the JBL Quantum 300 price in Kenya?
The JBL Quantum 300 sells for KSh 8,500 at Mascom International in Nairobi, brand new and sealed in its JBL box. For that money you get the headset, the USB audio adapter, the mic windshield and a 12-month warranty serviced at our Kimathi Street store. You pay on arrival anywhere in Kenya, by cash or M-Pesa. It costs KSh 2,500 more than the JBL Quantum 100 and KSh 2,500 less than the JBL Quantum 350 Wireless.
What does the USB adapter on the JBL Quantum 300 do?
The USB audio adapter turns the JBL Quantum 300 from an analogue headset into a USB sound device, which unlocks JBL's PC features. Plugged into a Windows computer, it enables JBL QuantumSURROUND and the JBL QuantumENGINE app, with separate profiles, an equalizer with six presets and microphone settings. JBL also lists the USB connection for PlayStation and Mac, though surround and the app stay PC-only. On an Xbox, a Switch or a phone, leave the adapter out and use the 3.5mm plug.
Which consoles and phones does the JBL Quantum 300 work with?
Through its 3.5mm plug, the JBL Quantum 300 works with PS5, PS4, Xbox Series X, Xbox Series S, Xbox One, Nintendo Switch, PC, Mac, mobile and VR, according to JBL. On PlayStation and Xbox, the plug goes into the controller's jack. On a Switch, it goes straight into the console, so handheld play is covered. Before buying for a phone, check it still has a headphone jack; many recent Android phones and every current iPhone need a USB-C to 3.5mm adapter.
JBL Quantum 300 or JBL Quantum 350 Wireless: is wireless worth the extra KSh 2,500?
Wireless is worth it only if cables bother you; otherwise the JBL Quantum 300 gives you bigger 50mm drivers against the 40mm units in the JBL Quantum 350 Wireless. The JBL Quantum 350 Wireless runs up to 22 hours per charge over a 2.4GHz dongle, but JBL does not list it for Xbox or phones. The JBL Quantum 300 works on every listed platform through its cable and never needs charging. Pick the wired model for multi-console homes and the wireless one for a PC or PS5 desk.
How do the JBL Quantum 300 cushions cope with Nairobi heat and dust?
The JBL Quantum 300 uses memory foam ear cushions that detach for cleaning, which matters in dusty Nairobi estates and humid Mombasa flats. Sweat and dust build up inside any closed headset over long sessions, so pulling the cushions off to wipe the cups keeps them fresh for longer. The lightweight fabric headband lets more heat escape than a solid padded band. During the dry season, store the headset in a drawer or bag rather than on an open desk by a window.
Can the JBL Quantum 300 help you hear footsteps in Warzone and Valorant?
Footsteps sit mostly in the middle and upper frequencies, and the JBL Quantum 300 covers the full 20Hz to 20kHz range through its 50mm drivers. On a Windows PC with the USB adapter, JBL QuantumSURROUND spreads sound around your head, so a player behind you sounds behind you rather than simply left or right. On PS5, the console's own 3D audio works through the 3.5mm cable. Xbox and Switch players get standard stereo, which still separates left from right clearly.
Is the JBL Quantum 300 good for remote work calls?
Yes, the JBL Quantum 300 handles Teams, Zoom and Google Meet calls on a laptop, which makes it a sensible single headset for hybrid workers based in Upper Hill or Westlands offices. The voice-focus boom mic is directional, so colleagues hear you rather than the open-plan office around you. Over USB, the QuantumENGINE microphone settings let you adjust how your voice comes across. Flip the mic up between meetings and you have closed headphones for focused work.
Who should buy the JBL Quantum 300 and who should skip it?
The JBL Quantum 300 suits PC gamers who also own a console and want one headset with surround on the computer and stereo everywhere else. Skip it if you mostly play on a phone and listen to music on the move; a Bluetooth pair such as the JBL Tune 730BT at KSh 7,500 serves that better. Skip it too if you want no cable at all, where the JBL Quantum 350 Wireless at KSh 11,000 fits. Console-only players on a tight budget can save with the JBL Quantum 100.
Technical Specifications
Audio Hardware
- 50mm neodymium drivers — larger speakers than many budget headsets carry, giving fuller bass from explosions, engines and film soundtracks.
- 20Hz to 20kHz frequency response — reproduces everything from low rumble up to the high click of a reload or a door opening.
- 100dB SPL sensitivity at 1kHz and 1mW — reaches loud listening levels easily from a controller, phone or laptop headphone jack.
- 32-ohm impedance — easy to drive, so even a phone delivers good volume without an external headphone amplifier.
- JBL QuantumSURROUND on PC — virtual surround that places sounds in front, behind and beside you using the two drivers.
- Closed over-ear cups — they wrap around the ear, which keeps your game audio from spilling into a shared room or office.
Microphone and Voice Chat
- Flip-up voice-focus boom mic — a directional microphone that favours your voice over keyboard clatter and room chatter.
- Built-in, not removable — the mic stays fixed to the ear cup, so there is no loose part to lose in a backpack.
- Flip-up movement — swing the boom up and out of your line of sight whenever you only want to listen.
- Foam windshield included — reduces breathing noise and the pop of hard consonants during calls and streams.
- Microphone settings in JBL QuantumENGINE — adjust how your voice sounds on a Windows PC through the USB adapter.
- Works with common voice apps — Discord, Teams, Zoom and console party chat all pick it up as a standard headset mic.
Connections and Platform Support
- 3.5mm audio cable — JBL lists PS5, PS4, Xbox Series X and Series S, Xbox One, Nintendo Switch, mobile, Mac and VR.
- USB audio adapter — converts the 3.5mm plug to USB for PC, PlayStation and Mac, according to JBL's specification.
- JBL QuantumENGINE software — profiles, a six-preset equalizer and microphone controls, available on PC only.
- 1.2-metre cable — reaches comfortably from a desktop tower under the table or a controller held in your hands.
- No pairing or charging — plug in and play on any listed device straight out of the box, even during a power cut.
Build, Comfort and Durability
- 245 grams — light for a headset carrying 50mm drivers, so long weekend sessions stay comfortable on the head and neck.
- Memory foam ear cushions — they mould to the shape around your ears and detach for cleaning after sweaty sessions.
- Lightweight fabric headband — spreads the weight across the top of your head and lets heat escape.
- No battery to age — the wired design leaves nothing inside that loses capacity, so performance stays the same year after year.
- Ear cup opening of 5.8 x 4.9 cm and outer size of 9.9 x 8.8 x 2.7 cm — sized to surround most adult ears.
- Colour: Black, the single finish JBL lists for this model, so there is no colour choice to confirm.
Controls and Inputs
- Flip the boom by hand — no button presses needed to move the mic out of the way between rounds.
- Single 3.5mm plug — carries game audio and your voice together into controllers, the Switch and phones.
- USB adapter for PC — the computer treats the headset as its own USB sound device, ready for QuantumENGINE.
- Six equalizer presets in QuantumENGINE — switch the sound tuning between game styles, music and films in a few clicks.
- Separate profiles — save different settings for gaming, work calls and music, then swap between them on PC.
Package Contents
Open the JBL Quantum 300 box and you will find the headset with its attached flip-up boom mic and 3.5mm cable, the USB audio adapter, a foam windshield for the mic, a Quick Start Guide, a warranty card and a safety sheet. The JBL QuantumENGINE software comes as a download from JBL rather than on a disc. There is no carry case in the box, so a drawer or shelf keeps the headset clear of dust between sessions.
Warranty
Mascom International covers the JBL Quantum 300 with a 12-month warranty against manufacturing defects under normal use. The cover applies to the headset, its drivers, the boom mic, the cable and the USB audio adapter supplied in the box. Claims go through our service desk in Nairobi CBD, so bring the headset and your receipt to the Old Mutual Building on Kimathi Street.
Buying the JBL Quantum 300 from Mascom International
You can find the JBL Quantum 300 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. Bring your laptop or controller and listen to the surround effect for yourself before paying. The JBL Quantum 300 comes in Black.
For stock checks, orders or setup questions, contact us:
- Phone/WhatsApp: +254 708 852 521
- Email: info@mascomintl.com
- Website: www.mascomintl.com
Every order ships with pay-on-arrival to all 47 counties, so you inspect the headset before paying. Nairobi and its environs get same-day delivery, while Thika, Machakos, Nyeri and Kisumu get theirs on the next business day. Mandera, Wajir, Marsabit, Lamu, Tana River, and Turkana receive delivery within 2-3 business days. Your purchase is protected by the 12-month warranty described above. Our team gives you accurate specifications, fair and current pricing, and real support after the sale, from installing QuantumENGINE to fixing a console audio setting.
