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K2 Composite Sandwich Membrane/Cone: The FOCAL K2 Power 40KX
features a composite sandwich membrane/cone comprised of a foam layer, sandwiched
between two Kevlar layers. The result is a material structure that is rigid, yet
light weight, and allows fast bass response without distortion.
NBR Surround: The 40KX features a long-throw NBR (Nitrile Butyl
Rubber) surround for long excursion, deep bass (25-1000 Hz), and added durability to
promote long life.
Copper Voice Coil: The dual 2-ohm voice coils are 4 layer,
2.55" diameter, edge-wound copper on an aluminum former, resulting in high
power handling, low distortion, and impedance flexibility to allow an optimized
connection to the amplifier.
Dual 2-ohm Voice Coils: This woofer features two 2-ohm voice
coils that offer wiring flexibility. When the voice coils are wired in parallel,
the woofer presents a 1-ohm load. When the voice coils are wired in series, the
woofer presents a 4-ohm load.
High-Performance Spider: The 40KX features a high-performance
spider with the tinsel leads sandwiched between the two layers to eliminate wire
Multi-Ferrite Magnets: The 40KX utilizes six triple-stacked
Ferrite magnets (18 total) to create a powerful magnetic field to help suppress
compression and give better power handling. This Multi-Ferrite motor assembly
allows for greater efficiency (92.5 dB), higher power handling capabilities,
and natural cooling of the woofer's voice coil.
Die Cast Zamak Basket: The vented die-cast Zamak basket is
rigid, non-magnetic, and non-resonant. The vented basket provides a self-regulated
coil cooling system, allowing air to flow freely to prevent heat build-up.
Spring-Posts: The woofer features two sets of nickel-plated
spring-post speaker terminals that will accept pin connectors, dual and single
banana plugs, and bare wire up to 8-gauge.
Removable Cloth Cover: The K2 Power 40KX woofer comes with
a cloth cover to protect the magnet from scratches or smudging during transport,
handling, and installation. The cloth cover should be removed when the woofer is
Sealed Box Volume: The 40KX is designed to be installed in
a sealed box with a volume between 1.4 ft³ and 2.82 ft³. FOCAL highlights three
specific sealed enclosures in the manual:
- 1.41 ft³: Fast and tight bass, -3dB
frequency of 41 Hz
- 2.19 ft³: Punchy and dynamic bass,
-3dB frequency of 37 Hz
- 2.82 ft³: Deep and articulate bass,
-3dB frequency of 36 Hz