Chad, there's a review here. http://forum.audiogon.com/cgi-bin/frr.pl?raccs&1103219869&read&3&4&
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I had previously purchased two Blue Circle MKII Noisehounds, but found that they noticeably limit the music dynamics. And unfortunately, they were also non-refundable.
I've had far better results using the "Quantam ElectroClear". They produce a quieter background, enlarge the soundstage, and make the music sound much more natural.
I feel the ElectroClear's are worth looking into as an alternative to the Noisehounds.