JBL 306 MKIII

The Series 3 evolves to deliver even more accessible reference monitoring

The JBL 306P MkIII builds on the Series 3 line, a range of studio monitors designed to provide reliable reference monitoring for home studios, post-production control rooms and modern creative spaces. Its mid-sized format offers an excellent compromise between the compactness of a 5-inch monitor and the scale of an 8-inch model.

This third generation retains the fundamentals behind the series’ success: balanced reproduction, a wide stereo image and active amplification precisely calibrated for each loudspeaker. The 306P MkIII therefore prioritizes an analytical presentation of the mix, without artificially exaggerating the lows or highs.

A versatile active monitor for producing, mixing and creating

The JBL 306P MkIII is aimed at producers, beatmakers, musicians, sound engineers and content creators looking for a nearfield monitor capable of revealing the essential details of an arrangement. It is equally suited to building a beat, editing vocals, mixing virtual instruments, sound design or video editing.

Thanks to its 16.5 cm woofer, it delivers more low-end body than a more compact model. Kick drums, bass lines and synth pads gain clarity, while remaining sufficiently controlled for working at a reasonable distance in a treated or semi-treated room.

To create a coherent stereo monitoring setup, use two JBL 306P MkIII monitors, positioned at ear height and angled towards the listening position. Their controlled directivity helps maintain a precise image, even when making small movements in front of the workstation.

An acoustic design developed for faithful mix translation

Image Control waveguide: stereo image precision

The soft-dome tweeter is integrated into the JBL Image Control waveguide. This architecture promotes wide, even dispersion of high frequencies, making it easier to position panned elements, reverb, transients and background elements. The result is a more stable soundstage, which is particularly useful for making reliable mixing decisions.

Extended low end and Slip Stream port

The 16.5 cm woofer works with a Slip Stream bass-reflex port designed to smooth airflow. This solution contributes to a deep, better-controlled low-frequency response while reducing airflow noise as the level increases. The 306P MkIII therefore makes it easier to accurately assess the impact of a kick drum, the weight of an electric bass or the energy of an electronic production.

112 W bi-amplification and active crossover

Each transducer has its own 56 W Class D amplifier. This bi-amplification provides appropriately matched power for both the woofer and tweeter, with comfortable headroom and more precise separation between frequency ranges. The fourth-order Linkwitz-Riley crossover, set at 1425 Hz, helps preserve coherence between the low, mid and high frequencies.

Adjustments to better suit your room

A monitor is never listened to in isolation: proximity to a wall, desk or corner can artificially boost low frequencies. The JBL 306P MkIII features a Boundary EQ setting that attenuates the low end around 50 Hz depending on its placement. The HF Trim selector adjusts the high-frequency level to adapt monitoring to the acoustics of your space.

The balanced XLR and TRS jack connectivity makes it easy to integrate the monitor with an audio interface, mixing console or monitoring controller. An input sensitivity selector lets you optimize the input level according to the source being used, whether it is professional line-level equipment or a lower-level device.

Technical specifications

Bluetooth	No	EQ	No
Connection	XLR, Jack	Color	Black
Speaker diameter	6"	Quantity	1
Number of speakers	2

Type	two-way active studio monitor	Coverage angle	120 degrees horizontally and 90 degrees vertically
Acoustic loading	bass reflex with Slip Stream port	Input sensitivity at −10 dBV	92 dB at 1 meter
Woofer	165 mm, or 6.5 inches	Signal-to-noise ratio	75 dBA, A-weighted
Tweeter	25 mm, or 1 inch	Configuration	bi-amplified
Tweeter type	soft dome	Tweeter amplification	56 W Class D
Crossover frequency	1425 Hz	Woofer amplification	56 W Class D
Filtering	fourth-order acoustic Linkwitz-Riley	Total power	112 W
Frequency response at ±3 dB	47 Hz to 20 kHz	HF Trim setting	−2 dB, 0 dB, +2 dB
Frequency range at ±10 dB	39 Hz to 24 kHz	Boundary EQ setting at 50 Hz	−3 dB, −1.5 dB, 0 dB
Low-frequency extension at −10 dB	39 Hz	Input sensitivity selector	+4 dBu and −10 dBV
Maximum peak SPL level	110 dB	Maximum input level	+6 dBV or +20.3 dBu
Maximum continuous SPL level	92 dB	Power supply	100 to 240 V AC, 50 or 60 Hz