Founded in 1961, British apostle maker KEF pioneered concentric drivers with its Uni-Q technology in 1988. Since then, Uni-Q has been a authentication of KEF speakers alike to this day.
Now, KEF has alien addition new technology, this time focused on subwoofers. Called Uni-Core, it places two drivers in a dual-opposing configuration—that is, army on adverse abandon of a cabinet. They beat in appearance with anniversary other, affective entering and apparent in unison.
By itself, that’s not new; abounding subwoofers use dual-opposing drivers—including the Sonos Sub—because the force imparted to the chiffonier from anniversary one cancels out the force from the added one. This abundantly reduces chiffonier resonance, which can alter the sound, and prevents abate subs from “dancing” beyond the floor.
What makes Uni-Core different are the articulation coils of the dual-opposing drivers. One articulation braid is abate than the added and nestled aural the beyond one (see Fig. 1). The electrical accepted in anniversary articulation coil—the audio signal—generates an aquiver alluring acreage that interacts with the acreage from a single, abiding neodymium magnet, causing the articulation coils to beat in concert with the audio signal. Anniversary articulation braid is absorbed to a diaphragm, which vibrates accordingly.
As you can see in this cutaway, the articulation braid for the disciplinarian on the larboard is abate than the articulation braid for the appropriate driver. As they vibrate, they absolutely overlap, which reduces the amplitude they charge afterwards abbreviating their excursion. Both collaborate with the aforementioned abiding magnet.
You adeptness wonder, as I did, about the aberration in admeasurement of the two articulation coils and how that affects the alluring fields they generate. Since they both collaborate with the aforementioned abiding magnet, their aquiver fields should be identical. According to KEF, that aberration is electrically compensated for so that both present as electromagnetically equal.
The ambition of Uni-Core is to accredit high-quality achievement while decidedly abbreviation the admeasurement of the chiffonier to accomplish the subwoofer added aesthetically pleasing. With nested, overlapping articulation coils, the drivers acquire abundant added circuit than a similar-sized dual-opposed, force-cancelling design, acceptance abundant added achievement and low-frequency acknowledgment from a abundant abate cabinet.
The KEF KC62 subwoofer is the aboriginal apostle to affection KEF’s Uni-Core technology.
KEF’s new KC62 bunched subwoofer is the aboriginal artefact to apparatus Uni-Core. The closed chiffonier is almost cubical barometer about 10 inches on a side, and the drivers are alone 6.5 inches in diameter. Such a baby subwoofer would commonly account out able-bodied aloft 20Hz, but the abundance acknowledgment of the KC62 is defined to extend from 11Hz (!) to 200Hz (±3 dB). Of course, no one can apprehend 11Hz, but an addendum that low does accommodate “footroom” so that the everyman aural frequencies do not ever tax the sub’s capabilities.
Another new technology acclimated in the KC62 is what KEF calls a P-Flex Beleaguer (aka Origami Surround). The surround, a adjustable actual that attaches the disciplinarian to the frame, employs a different pleated architecture aggressive by origami, the Japanese art of cardboard folding. This architecture resists acoustic burden in the chiffonier bigger than a accepted beleaguer afterwards abacus accumulation and attached sensitivity, acceptance the disciplinarian to move added precisely, which is said to aftereffect in added addendum and added accurate, abundant bass.
To abate absolute harmonic baloney (THD), KEF has included its Smart Baloney Ascendancy Technology in the KC62. Abounding subwoofers use an electromechanical sensor to adviser the driver’s position about to the waveform of the ascribe signal. Back non-linear discrepancies occur, which is accepted at aerial excursion, the driver’s motion is bound to abate distortion. By contrast, Uni-Core’s low voice-coil inductance allows the KC62 to use an analog accepted sensor to anon and anon admeasurement the accepted in the articulation coil, which is abundant added authentic than an electromechanical sensor, thereby abbreviation THD up to 75 percent.
The 6.5-inch drivers on anniversary ancillary are astern domes.
Additional accomplished affability is provided by KEF’s Music Integrity Engine, a set of custom DSP (digital arresting processing) algorithms. For example, iBX (Intelligent Bass Extension) uses agenda EQ to extend the low range, while SmartLimiter consistently analyzes the arresting to anticipate clipping.
Then there’s the amplification—in this case, two distinctively advised Class D amps, anniversary one pumping out 500 watts RMS to its agnate driver. These amps are said to accommodate accomplished ascendancy forth with the adeptness to bear abrupt bursts of ability back needed. In fact, the KC62’s best acoustic achievement is defined to be a whopping 105dB SPL.
Placement aural a allowance is cool adjustable acknowledgment to the cabinet’s closed architecture and bristles Allowance Placement Equalization presets, which you baddest on the rear ascendancy panel. These presets acclimatize the EQ according to area you abode the sub; options accommodate abroad from the walls, up adjoin a wall, in a corner, in a cabinet, and in a baby apartment.
Speaking of the rear panel, the KC62 offers a nice array of connections, including line-level inputs and outputs, and speaker-level inputs on a Phoenix connector, which is accepted in Europe. One of the line-level inputs is labeled “LFE,” which you would affix to the LFE (low-frequency effects) achievement from your AV receiver or preamp-processor application its centralized low-pass crossover. The added band ascribe is labeled Smart Connect, which automatically adjusts the accretion of a non-LFE input.
The rear console holds all access and controls, accouterment for adjustable setup.
As with best subwoofers, the KC62 can acquire full-range signals, and its Crossover punch sets the aerial absolute of the frequencies that are beatific to the sub. Addition ascendancy lets you specify the lower absolute of the high-pass filter, which sends the mid and aerial frequencies in the ascribe arresting to the line-level outputs and on to powered accessory speakers or added devices. The HPF ascendancy consists of four DIP switches that would commonly be acclimated alone by an installer; for best customer installations, you would aloof leave those switches in their absence positions.
Also on the rear console is a adapter labeled “Exp.” This is an amplification anchorage that lets you attach the receiver bore of the KEF KW1 Wireless Subwoofer Adapter Kit. Affix the transmitter to the achievement of your A/V receiver or pre-pro to authorize a wireless affiliation to the sub.
Finally, the KC62 offers a adorable aesthetic. The arced chiffonier is crafted from extruded aluminum, and it’s accessible in Carbon Black or Mineral White, acceptance it to alloy in with aloof about any décor. Plus, its diminutive admeasurement lets it fit aloof about anywhere.
With beauty, brains, and beef in a decidedly baby package, the KC62 is abiding to agitate things up in the subwoofer world—and in your home—thanks to Uni-Core technology and KEF’s aberrant engineering. It is accessible now for a account amount of $1,500. We can’t delay to booty it for a spin!
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