Does anyone know of a site for Threshold information?

Try the link listed below. Jon Soderberg used to be a factory service tech for Threshold / Forte'. He does repairs, upgrades, mods, etc... on these pieces along with offering a brief background on some of the products and the company. If you try contacting him, be patient. Sean
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http://www.rsvlonline.net/vintageamp/

Explore the archive at this one too for pics and specs on some of the last generation of Threshold products:

http://www.threshold-audio.com/Index.html

Viva Threshold!