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Usher makes a little monitor, the S-520 employs a two-way, front-ported, 1" silk-dome tweeter and a 5" polypropylene mid-bass cone. It was beyond belief in terms of performance, construction, quality, and price. The Usher S-520s sold as fast as they could import them. The S-520 was in 2004 the entry-level two-channel bookshelf speaker from Usher Audio Technology, a Taiwanese company at that time manufactures more than two dozen two-channel speakers. All were designed by Dr. Joseph D'Appolito from the United States and in Taiwan, Usher's Tsai Lien-Shui.
It was recommended that the S-520s must be listened to with their grilles off, otherwise there would be measurable and audible diffraction problems. Usually by removing a speaker's grille results in slightly more detail. Sometimes there's also a slight shift in tonal balance with more emphasis on the high frequencies. This is what happened after removing the grille, the highs became sweeter, more laid-back, very natural and much more coherent.