[dukecv]

I remember my cousin had it in his truck stereo and it was amazing. They also made stuff for home audio. I'd like to get my hands on one for my home. Here are some review links.

http://www.soundstage.com/masz03.htm

http://hometheaterhifi.com/volume_4_4/tds2processor.html

http://www.stereotimes.com/acc110198.shtml

[soundbitten1]

I got a version made by Acoustic Research.

https://www.amazon.com/Acoustic-Research-TDS202-Enhancement-1-Speaker/dp/B00005QZ16

Also a Source Component Electronics Harmonic Recovery System

http://www.soundstage.com/revequip/weaver13.htm

and a ADE-24 Magenta (Margules Audio)

http://hometheaterhifi.com/volume_6_4/magenta-ade-24-analog-digital-enhancer.html

[witchdoctor]

I have not used my TDS unit in years but enjoyed it for a while. When you improve your front end it masks the clarity.