Klipsch Synergy Series SLX/SUB-10 System Reviewed

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Since the Klipschorn� was patented 60 years ago, Klipsch loudspeakers have continued to evolve while never wavering from the four design principles the legendary Klipschorn� embodied: high efficiency with low distortion, controlled directivity, flat frequency response and wide dynamic range.

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The cornerstone of all of this is the use of horn technology. A properly utilized horn can have a dramatic effect on the output level and frequency response, particularly of the mid and high frequencies. Without using any more amplifier power, the horn-loaded speaker can play efficiently and accurately at much higher output levels than a comparable, non-horn loaded competitor.

Unique Features
With the gray grilles on using a magnet-style attachment, the SLX mains present a trim silhouette. With them off, it is apparent that considerable thought went into the SLX's appearance. The very nice blend of form and function in the classic D'Appolito configuration gives a nice balance to the look, regardless of mounting position, and is a proven design. The sculpted ports at both ends of the speakers add to the visual impact of the grille-less SLX.

The wall mounts for the SLX look basic: relatively thin, light, shorter than the speaker, with a large tab at each end. How the SLX attaches to, works while on, and removes from the bracket is going to have a lot of competing product designers experiencing the ol' palm slap to the forehead, "Why didn't I think of that?" The rear of the SLX has one slot at each end. Simply line the slots up with the tabs or mounting posts and push. A click will tell you the Positive Lock Attachment� system has locked the speaker into the bracket. While there, the speaker can be pivoted 30 degrees to allow you to "toe-in". Removing the SLX requires only a push of a button and a light pull. As a user-friendly finishing touch, wire management is also part of the design.

I described the speaker configuration on the SLX as a D'Appolito design. Insofar as the two 4.5-inch drivers are mounted on each end of the SLX with the tweeter mounted in the center of the speaker, the design fits my description. However, Klipsch has designed the speaker to make it perform differently in some respects than the D'Appolito design is known for. Normally, speakers designed this way and used vertically exhibit broad horizontal dispersion of the high frequencies. At the same time, vertical dispersion is controlled between the two larger drivers. This could potentially create sonic differences when the speakers are used differently, say if the mains are used vertically, and the center (in more than a 2.1 system) is used horizontally. Klipsch has designed a round Tractrix� horn around the tweeter, which frees the tweeter from the acoustic boundaries normally produced by the drivers.

The SUB-10 subwoofer is not significantly different in appearance to a multitude of other woofers. It is of about medium size when compared to other cabinets using a 10-inch driver. The top edge and corners are rounded in nicely. The feet are an "outrigger" design, extending a little beyond the cabinet's width. On the rear are connections for high-level (speaker wire), or line-level (RCA) inputs. There is a master power switch and toggle for setting the woofer to be always on or to auto, plus a phase toggle. Missing from the SUB-10 (and most other subs in this price range) is a bypass for the internal crossover. Many modern surround sound receivers incorporate an adjustable crossover in the receiver itself, and on most of these receivers the internal crossover cannot be bypassed on the sub pre-out. I would love to see this conflict resolved.

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