Usher Audio S-520 bookshelf speakers from 2008. The finish is flawless offering the most vibrant beautiful natural cherry veneers ( happens to be the most expensive finish). The sound is beyond belief which delivers transparent with great imagine and perfect sound stage. The S-520 performs very well as a two channel systems for such a small speaker, it does well in a large area. No other Usher loudspeaker has won more awards than the S-520. Each speaker incorporates a 1″ dome tweeter crossed over at 2kHz to a 5″ mid-woofer, and a front port. A perfect setup that you really can use on a bookshelf.
The S-520 is about 12″ high, just over 7″ wide, and 10.5″ deep, and is fairly heavy at 15 pounds. It can be bi-wired and has hefty binding posts (missing binding clamps). According to Usher’s specs, the S-520 is 86dB/W/m is not an unusual sensitivity rating for a small speaker. Its claimed frequency response is 52Hz-20kHz, +/-3dB.