Floor Loudspeaker Reviews

After reviewing a long series of minimonitors, I am now working on what may well be an equally varied selection of large floorstanding loudspeakers. This trend began with my">http://www.stereophile.com/floorloudspeakers/1207sonus">my review of the Sonus Faber Cremona Elipsa in the December 2007 issue, and continues this month with the Series 2 version of the KEF Reference 207, until recently the flagship model from this English manufacturer (footnote 1). I reviewedhttp://www.stereophile.com/floorloudspeakers/775">reviewed; the original Reference 207 in February 2003, and was very impressed by what I heard.

Of all the speakers I have most enjoyed in recent years, two were from British manufacturer KEF: the LS50 Anniversary Model ($1500/pair), which I reviewed in December 2012; and the Blade Two ($25,000/pair), which I reviewed in June 2015. Though these two speakers lie at opposite ends of the price scale, they have in common KEF's unique Uni-Q drive-unit, in which the tweeter is mounted on the front of the midrange unit's pole piece, so that the lower-frequency cone acts as a waveguide for the higher-frequency output.

By now most readers will be familiar with the relatively new tuned-cavity method of low-frequency loading. Such designs have popped up all over the place of late, especially in those little satellite/woofer systems, but KEF can rightly lay claim to generating the design's theoretical basis, as JA described in his review of the KEF R107/2 loudspeaker in Vol.14 No.5 (May 1991). Essentially, the technique consists of loading the rear of a woofer in a conventional fashion—usually a sealed box—but also loading the front of the driver into another enclosure, ducted to the outside. Basically, the design acts as a bandpass filter with its response centered on the port-tuning frequency. The rolloff is smooth and rapid on either side of this frequency, providing a natural low-pass characteristic but thereby virtually mandating a three-way system. If properly designed, this configuration offers a number of theoretical advantages. The radiating element is actually the air in the port, which is low in mass. Low distortion is possible, as is relatively high sensitivity.

Oh boy! This was one of my most eagerly anticipated auditions. At my first demonstration of an OLS loudspeaker system several years ago, I was bowled over not only by the demo, but also by the idea that OLS's Kharma line was topped by the $1,000,000 Grand Enigma system!

Not for nothing did I name the Kharma-Lamm room at Home Entertainment 2002 the "Best Sound in Show." Show attendees slotted it 17th best [see September 2002, p.59—Ed.], behind other rooms to which I also gave high marks—mostly larger rooms featuring far bigger loudspeakers—but to me, the sound emanating from the Kharma Ceramique 3.2 ($19,000/pair), driven by Lamm electronics, possessed a sublime balance of sonic qualities heard in few other rooms.

The idea of a loudspeaker system whose frequency response could be tailored to suit room acoustics and/or personal taste is one that has always appealed to the high-fidelity perfectionist. Ideally, such a loudspeaker would allow you to raise or lower the level of any part of the audio spectrum to correct for, say, a sharp 370Hz room resonance or a mild absorptive condition that weakens, say, the 800Hz–3kHz range. Obviously, though, this kind of flexibility would require an infinite number of bandpass networks, each with its own volume control—which is an obvious impracticality.

I'm fortunate to have reviewed in recent years not one but three different pairs of horn-loaded loudspeakers. My jaw dropped when I reviewed what would prove the finest loudspeaker to ever grace my home, the Volti Audio Rival. Second came a pricey but pleasing pair from handlebar-mustache king Gordon Burwell, the Burwell & Sons Homage. Then, at the urging of occasional Stereophile contributor Steve Guttenberg, I took on the fat-boy Klipsch Heresy III. As the Beatles used to say, I was dead-chuffed.