High-tech leads to extreme precision and depth in the relatively compact KEF KC92 subwoofer. REVIEWARY tests and compares. Tested at 2,399 Euros.
Unlike the KEF Kube 15 MIE, with its massive 15-inch driver, the KEF KC92, the flagship of KEF’s new subwoofer lineup, features two long-throw 9-inch woofers positioned back-to-back.
This setup, called “Force-Cancelling” by the Brits, has a purpose. In physics, every action has an equal and opposite reaction.
Opposing Uni-Core Drivers
Unlike the smaller KC62, the KC92 doesn’t require complex and space-saving designs for its drivers. The 9-inch drivers fit comfortably inside the cabinet. The opposing placement of these drivers ensures that the forces generated by the movement of the cones cancel each other out, thanks to their in-phase operation. This results in a genuine bipolar setup, which is not the same as a dipole that creates a cardioid sound pattern due to partial phase cancellation.
The bipolar design also enhances sound pressure levels and allows for the same sound output with less cone movement, thus reducing distortion. When combining the surface area of the two drivers, it approximates that of a single 12.8-inch woofer, with benefits like faster response times due to lower mass and inertia.
The two 9-inch drivers enable a more compact cabinet while maintaining substantial output.
The paper cones are reinforced with a flat, concave aluminum skin for additional rigidity, aiding in achieving the “piston-like” movement ideal. The ventilated voice coils and optimized motor system further enhance performance.
Music Integrity Engine
KEF’s “Music Integrity Engine” ensures meticulous coordination between the driver, DSP, and amplifier for an optimized, harmonious sound system.
The KC92’s amplifier power is about one kilowatt, split evenly at 500 watts per driver, surpassing the Kube series and accommodating extreme peaks often found in home cinema rather than music. Efficient Class-D amplifier technology makes this possible.
“Intelligent Bass Extension” (IBX) is also included, enhancing bass depth and volume in a relatively compact form using EQ and controlled power.
Five presets for different placements (free-standing, against a wall, in a corner, inside a cabinet, or in an apartment) assist with setup. Line and high-level inputs allow for compatibility with various speakers and systems, while a line output with a high-pass filter aids integration with amplifiers or active speakers. The KC92 automatically detects whether it’s being fed mono or stereo signals via its SmartConnect feature.
P-Flex Driver Surround
A unique feature of the bass drivers is the P-Flex surround, resembling a spiral cable and inspired by Japanese paper folding. This design provides extreme stability and resistance, contributing to a highly musical performance. The system is rated down to 11 Hz, indicating its capability to produce earthquake-like bass despite its compact size.
In acoustic comparison with the Kube 15 MIE, the KC92 immediately dispels any impression of being smaller. It delivers deep, powerful bass with extreme precision, outperforming its “bigger” brother.
For those needing more, KEF offers a stacking kit for around 200 Euros, allowing two KC92s to be stacked while saving space. However, if space permits, distributing multiple subwoofers throughout the room is recommended to balance room modes more effectively.
Available in glossy white or black, the KEF KC92 integrates seamlessly into high-end living spaces.
KEF KC92 Specs
Info: kef.com
Contents: Manual, rubber feet, power cable
Connections: Line in (Low-Level 2x RCA), Line out (2x RCA), High-Level In (Neutrik), Trigger
We tested with: Pink Floyd “The Wall,” Stevie Wonder “Live At Last,” Michael Jackson “Number Ones.”
Verdict
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