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JBL Synthesis K2 S9900 Floorstanding Loudspeaker

Raising the Standard for Ultrahigh-end Luxury Audio

The JBL Synthesis Project K2 S9900 loudspeaker system represents the culmination of extensive research and development in sound reproduction over the last half century. JBL engineers have labored to create a loudspeaker system with no acoustical or electrical limitations whatsoever. While the Project K2 S9900 is itself a new development, the goal that it achieves goes back to the earliest days of the original James B. Lansing Sound Company.


In order to re-create the extremely high dynamic range provided by today’s audio sources, a brand-new low-frequency transducer was developed from the ground up, utilizing an alnico magnet, a 4-inch (100mm) edge-wound voice coil, and a 15-inch (380mm) cone. Extensive computer-aided engineering and design effort were necessary to develop the optimized port tuning used in Project K2 S9800, and has resulted in a significant advance in the concept of state-of-the-art acoustic reproduction. As a result of the K2® efforts, a speaker system with higher sensitivity and a wider dynamic range became a reality without power compression or distortion, even at extremely high drive levels.

The K2 S9900 continues the tradition of the K2 S9800 and also incorporates key design elements from the DD66000. Despite its 21st century power and sophistication, Project K2 S9900 is a synthesis of tradition and technology. It reflects the design, material, engineering and manufacturing expertise developed and refined through nearly six decades of experience that are the exclusive legacy of one loudspeaker brand.

Features and Benefits

15-inch woofer with Alnico magnet and 100 mm voice coil, cast frame and 16 kg motor structure

High frequency compression driver and horn with 4-inch magnesium diaphragm

Precision-molded Sonoglass® HF horn throat section integrated with curved baffle

Ultra-High Frequency compression driver with1-inch beryllium diaphragm

Sonoglass® UHF horn mated to a die-cast aluminum housing

Separate crossover boards for each frequency section

Heavily-braced curved front and rear enclosure eliminates cabinet-induced coloration

Wood Grain or Black Zebra Wood (ZW) Finish

Detailed Specifications:

Description: 3-Way 15″ Floorstanding Loudspeaker

Frequency Response: 48Hz – 50 kHz

Low Frequency Extension: 33Hz

Recommended Amplifier Power: 500 Watts

Sensitivity: (2.83V @ 1m) 93dB

Nominal Impedance: 8 ohms, 7 ohms minimum at 100Hz, 4 ohms minimum at 40 kHz

Crossover Frequencies: (Hz) 900Hz (24dB/octave) 15 kHz (24dB/octave, high-pass only)

Ultrahigh-frequency Drive Components: 1” (25mm) Magnesium compression driver (045Be-1)

High-frequency Drive Components: 4” (100mm) Magnesium compression driver (476Mg)

Low-frequency Drive Components: 15” (380mm) Pulp-cone woofer (1500AL-1)

Size: Height 47-5/16″ (1200mm) Plus 0.8” (20mm) for feet x Width 22″ (560mm) x Depth 13-13/16” (350mm)

Weight: 182 lb (82.7kg)


Documentation to be added soon . . .