I recently purchased one of these for a very low price. I found that it did boost certain aspects of the sound and, with certain CDs seemed to add detail and volume. On others, however, it seemed to add a grittiness to the sound. For example it did a nice job with a recording of Rachmaninov Piano Concerto #2, opening up an otherwise "cloudy" recording. On the other hand, a solo piano performance by Vladimir Horowitz became less smooth and poetic IMHO. As a fan of tube sound, it seemed to take a little of the sweetness out of Vlad's performance. For me, the jury is still out but, I thought I'd send along my impressions.
TDS "True Dimensional Sound" Black Box
has anyone had any experience in using one of these "black boxes" that supposedly recovers musical nuances lost in the recording process and if so, what, if anything did it do in your system??