In the mid 90s, the KEF 107 and the B&W Matrix 801 were the speakers to have (if you could afford them).
They both had a similar layout with larger cabinets at the bottom leading to smaller cabinets at the top, thus creating the necessary time alignment. They differed mostly on how the bass was produced. While the 801's relied on a single large woofer, KEF chose a more technically sophisticated approach utilizing dual isobaric woofers housed in an internal chamber. This allowed for a slimmer lower cabinet and a far better looking speaker, without compromising the low frequency performance.
We are big fans of both speakers, and thankfully we don't have to chose as we often have both sets in stock to play with.
This particular sample came to us from a collector that took great care of them. The woofers on these KEF's usually suffer from rotting of the surround material, as in the 90's they didn't really know how to make foam surrounds last for eternity. These have had the woofer surrounds replaced professionally (both surrounds and annulus) and are in perfect working condition. The tweeters and mids are also in perfect working condition and output evenly and precisely. The cabinets show a bit of wear but nothing too noticeable.
Sound quality is superb with a tinge of vintage sound, while being able to provide the dynamics of a modern speaker. Really no compromises are evident unlike some other vintage speakers from this era.
Here are some details from Stereophile:
The Model R107 represents the flagship of KEF's Reference Series, and is second only to the Professional Series KM-1 in KEF's product line. Anatomically, the 107 resembles a person. Beneath a decorative "hat," there's a special head assembly akin to the head on the old Model R105. This head assembly contains the brains of the 107, namely a T33 ferrofluid-cooled tweeter and an improved version of the classic B110 midrange driver, featuring a better voice-coil and a new polypropylene cone. The nerve center is also here, in the form of two passive dividing networks and load-impedance equalizing network.
The guts of the 107 are housed in the main low-frequency enclosure that forms the body trunk. The bass loading used by KEF has the intimidating name of "twin coupled-cavity bass loading" and was first seen in the Model 104/2. (In retrospect, the 107 may be seen as a hybrid of the 104/2 and 105 technologies, with a few improvements thrown in.) The "twin" in the title refers to the use of two 10" paper-cone woofers, each working in its own sealed enclosure and firing into a common central cavity. Acoustic energy from the cavity is vented via a tuned port that radiates from the top face of the LF enclosure adjacent to, or at the neck of, the head assembly.