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Edge Audio 502D Home Theater System Print E-mail
Monday, 01 January 2001
Article Index
Edge Audio 502D Home Theater System
Page 2
ImageAt $1,399, the 502D home theater system may prove to have the guts not only to break into the crowded market of bookshelf style speakers, but the technology to bust it wide open.

The 502D system includes four 502D-LR satellite speakers, which house a five-inch magnetically-shielded woofer/midrange and a one-inch magnetically-shielded soft dome tweeter. The 502D-C center channel enclosure has basically the same configuration as the 502D-LRs, but its spade lug connectors are mounted to facilitate center channel horizontal placement. Each speaker component has been designed by Vifa, a Denmark-based company that has the reputation for producing high-quality and well-crafted components. To reduce resonance, these enclosures are constructed of solid plank hardwood, as opposed to veneer wrapped MDG particle board. These speakers also contain internal bracing and acoustic damping material to eliminate high-frequency reflection. They measure 11 inches high by six inches wide by six inches deep. For the bottom end, the 502D system includes the SW-12/320 long-throw front-firing powered 12-inch subwoofer, which packs a 320-watt punch. The back panel controls of this unit include gain control, frequency roll-off control, auto signal detection (on/off), phase switch (reverse/normal), low-level RCA input and output pairs and four pairs of speaker outputs to drive the satellites. The enclosure measures 20 inches high by 15 inches wide by 20 inches deep and is constructed in the same fashion as the 502D-LR and 502D-C.

We as writers/reviewers of AV products rarely get into crossover technology when it comes to loudspeakers. The reason for this is that crossover technology really hasn't changed much in several decades. Typically, two- and three-way speaker system crossover networks use a series of inductors and capacitors, which filter signals and direct differing frequencies to the appropriate speaker. Edge Audio has licensed DiAural technology, which has changed this path in a very big way, without the big price tag.

Here's how DiAural technology works: Let’s say that sound is reproduced through a microphone. There is a natural modulation that occurs between the high and low frequencies. High frequencies will modulate up and down as lower frequencies push them around, depending on the low-frequency amplitude. This encoding stays intact throughout the recording and playback chain. However, once the audio signal hits a conventional crossover network, a filtering process occurs that can leave behind signal information or, worse yet, deliver a signal that is not phase coherent. Remember what used to happen when you played the grade school game "Telephone"? In essence, DiAural technology eliminates the use of inductors and capacitors to filter audio signals. The signals themselves are taken through a simplified circuit that allows the woofer and tweeter in a two-way system – or woofer, midrange and tweeter in a three-way system – to speak directly to one another.


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