JBL 3 Series MkIII is a major overhaul of the 3 Series platform, built for the way music, video and content are produced today. The family includes three powered studio monitors — 305P MkIII, 306P MkIII and 308P MkIII — plus the 310S MkIII subwoofer.  Creators have configuration flexibility ranging from a compact stereo setup to 2.1, surround and immersive monitoring.

The redesign starts with the acoustic system. The redesigned high-frequency driver and improved JBL Image Control Waveguide deliver a wide, consistent listening area with exceptional stereo imaging.  A new low-frequency driver uses stiffer cone materials, an upgraded magnet assembly and an aluminum shorting ring to improve power handling and reduce distortion.  The front-firing JBL Slipstream port helps bass response stay more predictable on desks, near walls and in compact rooms.

MkIII also improves the signal path by leveraging a new Class D amplifier, which provides higher output, more headroom, and lower noise.  Balanced Neutrik combo inputs and selectable +4 dBu / -10 dBV sensitivity make setup straightforward with common studio devices and playback systems.

Because project studios and home studios can take many forms, every full-range model includes four one-touch controls for corrective EQ adjustments. This provides 81 corrective EQ combinations for placement, wall distance and high- or low-frequency adjustments.  No dip switches, measurement rigs or calibration software is required.

The system is designed to expand for any speaker configuration. Every monitor includes eight M4 mounting points for elevated, inverted or side-firing placement.  The 310S MkIII adds low-frequency extension and bass management for 2.1, surround and immersive workflows.

The result is a more capable 3 Series: accurate, adaptable and ready for any project in any room.

The JBL 3 Series MKIII Studio Monitor Range

MKIII Feature Highlights

PRESS RELEASE | November 3, 2026

JBL Professional Introduces 3 Series MkIII Powered Studio Monitors and Subwoofer

 

NORTHRIDGE, CALIFORNIA — HARMAN Professional Solutions, the global leader in audio, video, control and lighting systems, today announced the JBL Professional 3 Series MkIII powered studio monitor family. Representing the most extensive redesign of the 3 Series platform to date, the new lineup includes the JBL 305P MkIII, 306P MkIII and 308P MkIII powered studio monitors, along with the JBL 310S MkIII powered subwoofer. 

Building on the legacy of the JBL Professional 3 Series, the MkIII family introduces redesigned acoustic systems, new Class D amplification, simplified room optimisation and integrated mounting options to support workflows ranging from compact stereo production setups to 2.1, surround and immersive monitoring.

The redesigned high-frequency driver works with an updated JBL Image Control Waveguide to provide a wider, more consistent listening area and stable stereo imaging across the workspace. New low-frequency drivers feature stiffer cone materials, upgraded magnet assemblies and aluminum shorting rings to improve power handling while reducing distortion. A front-firing JBL Slipstream™ port design helps deliver more predictable bass performance when monitors are placed on desks, near walls or in other space-constrained environments.
 
The MkIII family also introduces new Class D amplification, providing increased output, greater headroom and lower system noise. Balanced Neutrik® combo inputs and selectable +4 dBu/-10 dBV input sensitivity simplify integration with common studio interfaces, mixers and playback systems.
 
To help users adapt monitors to different production environments, every full-range model includes four one-touch room controls that provide 81 corrective EQ combinations for speaker placement, wall distance and high- and low-frequency adjustment. The system requires no calibration software or complex setup procedures.
 
Integrated mounting points on every full-range monitor make it easy to expand beyond a traditional stereo configuration. Whether mounted on walls, ceilings or monitor arms, the family supports stereo, 2.1, surround and immersive monitoring systems. The new JBL 310S MkIII powered subwoofer extends low-frequency response to 26 Hz and includes selectable crossover settings and external bass-management bypass for flexible system integration.
 

3 SERIES MkIII SERIES HIGHLIGHTS:
 
RE-ENGINEERED ACOUSTIC SYSTEM
JBL Professional 3 Series MkIII features redesigned high-frequency and low-frequency drivers paired with an updated JBL Image Control Waveguide for improved stereo imaging, a wider listening area and reduced distortion. The front-firing JBL Slipstream™ port helps deliver more predictable low-frequency performance in real-world studio environments.
 
NEW CLASS D AMPLIFICATION
Every model features new Class D amplification that provides higher output, increased headroom and lower system noise. Balanced Neutrik® combo inputs and selectable +4 dBu/-10 dBV input sensitivity simplify integration with common studio interfaces, mixers and playback systems.
 
SIMPLE ROOM OPTIMISATION
Each full-range monitor includes four one-touch room controls that provide 81 corrective EQ combinations to compensate for speaker placement, wall distance and high- and low-frequency balance. The system requires no calibration software or complex setup procedures.
 
CONSISTENT LISTENING EXPERIENCE
The redesigned JBL Image Control Waveguide helps maintain consistent coverage across a wider listening area, creating stable stereo imaging and a focused phantom center for more confident mix decisions.

BUILT FOR MODERN PRODUCTION
The 3 Series MkIII family supports workflows ranging from compact desktop music production to video editing, podcasting, content creation and multimedia production. Three monitor sizes allow users to select the configuration that best matches their room and workflow.
 
READY TO SCALE
Integrated M4 mounting points on every full-range monitor support desktop, wall, ceiling and stand-mounted installations, making it easy to expand from stereo to 2.1, surround and immersive monitoring. The JBL 310S MkIII powered subwoofer extends low-frequency response and provides flexible crossover options for larger monitoring systems.