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GoodSound! Equipment Review -- Usher Audio Technology S ...
http://www.goodsound.com/equipment/usher_audio_s520.htm
The S-520 is Usher’s entry-level model: a small, two-way bookshelf speaker with 1" dome tweeter crossed over at 2kHz to a 5" mid-woofer, and a front port (a smart move for a bookshelf speaker that might actually be used on a …
Usher Audio Technology S-520 loudspeaker …
https://www.stereophile.com/content/usher-audio-technology-s-520-loudspeaker-specifications
Usher Audio Technology S-520 loudspeaker Specifications. Description: Two-way front-ported bookshelf loudspeaker. Drive-units: 1" UA25-10 silk-dome tweeter, …
Usher Audio Technology S-520 loudspeaker …
https://www.stereophile.com/content/usher-audio-technology-s-520-loudspeaker-measurements
I estimated the Usher S-520's voltage sensitivity to be 84.5dB(B)/2.83V/m, which is both a little lower than specified and on the low side. Its impedance, however, remains above 6 ohms for almost the entire audioband, with a minimum value of 5.3 ohms at 244Hz (fig.1), meaning that it will be a relatively easy load for an amplifier to drive.
S-520 – USHER - usheraudio
https://www.usheraudio.com.tw/portfolio-item/s-520/
The S-520 mini-monitor is a marvel of performance, quality and price. No other Usher loudspeaker has won more awards or been lauded by reviewers more often. At just $400 a pair, the 520s are a true Hi-Fi bargain. They deliver unprecedented dynamics and response for a cabinet of this size. For 2-channel and surround-sound mini-systems, 520s are ideal.
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