User manual FOCAL SUBWOOFER K2 POWER

[. . . ] Producing a full deep bass experience, even at high volume levels (27 KX, 33 KX and 40 KX). Spider braid sandwich All output braids whether single double or quadruple connections impregnated into spider, sandwiched to form one complete layer. The Focal guarantee only applies if the enclosed guarantee card is returned to us within 10 days of purchase. Due to constant technological advances, Focal reserves its right to modify specifications without notice. [. . . ] Also a traditional 2 channel stereo amplifier (high power recommended) can also be used, allowing further installation flexibility. The 27 KX subwoofer uses a single 4 ohms voice coil, thus consists of a single input terminal (fig. Verify the output stage and if your amplifier has a bridging function, to gain further benefit, use it. Choosing the correct enclosure or acoustic load (general) The correct acoustic load, normally the type of enclosure and volume made available to the subwoofer, is of prime importance for maximum performance. All pistonic acoustic devices (in this case subwoofers) require a defined acoustic load to work correctly. This means the type of charge (sealed or bass reflex) and volume (litres / cubic ft) must be chosen wisely, to gain maximum performance. They may accept your subwoofer, concerning the hole cut-out size for chassis, but do they match the volume or type of charge as defined in the subwoofer parameters?Sealed / closed box enclosure All K2 Power subwoofers (except the 46 KX 4) have been carefully optimised to work in sealed or closed box enclosures. This type of enclosure ensures sub bass frequencies remain full and controlled. Compared to a defined bass reflex enclosure, which normally has a slight increase in the sound pressure level, K2 Power subwoofers have improved power handling characteristics. Therefore this slight reduction of level can be compensated, with increased amplification. The mighty 46 KX 4 subwoofer incorporates a unique feature, consisting of 4 individual wound voice coils, intertwined together on the same vented aluminium former. Each voice coil winding has an impedance of 1 ohm, giving greater flexibility. Note that core section of connecting cables and complete amplifier compatibility must be verified before, for load ratings from 0. "Quad amping" can be included, with 4x separate amplifiers, offering identical specifications. Again, each amplifier power and load rating must be compatible for 1 ohms nominal impedance. Cut-off frequency Generally, it is accepted the frequency scale is from 60 to 100Hz, depending on many parameters (cabinet loading, exterior load of vehicle interior etc, etc). if in doubt , we recommend a cut-off frequency of approximately 80Hz be selected. Too high a cut off frequency and the "staging" will be uneven. Too low a cut-off frequency and the general performance maybe reduced. Finally a process of "trial and error" can be used to define this aspect, for maximum enjoyment of your K2 Power KX series subwoofers. Due to the large surface area available, with high strength multi-ferrite motor structure, together producing high efficiency necessary for dynamic power SPL installations. [. . . ] If you decide to build your enclosure, pay attention to the following recommendations: · When using the 46 KX 4, we advise the use of a profiled port so that air noises are prevented. Add damping material (foam) inside the enclosure (do not use fiberglass) to cancel possible resonances. If the sound is "closed-in" then remove some at the damping material. All Focal loudspeakers are covered by guarantee drawn up by the official Focal distributor in your country. [. . . ]