ST and Single Mode are both AT&T products. Theta used single mode and called it LaserLinque. It is vastly superior to ST but very costly. It was (is?) an $800 option on a Theta transport or DAC plus $250 for the cable. Total cost $1850! My brother and I both have Theta front ends and he has the single mode hook up while I'm using Tara Decade balanced digital cables. We really can't do an empirical comparison as he has a Data II transport and a Gen IIIa Dac, while my rig is a Data Basic transport and a Gen Va balanced DAC. We have looked inside his stuff and the single mode units are little interface boxes that Theta has painted over. I'd sure like to know the source of the interface is as I'm sure they could be obtained for much less than Theta charges and my circuit boards are set up for them. 10 minutes with a soldering iron and... If you enter "single mode" on ebay, all sorts of stuff pops up and I wish I knew if any of it is what I need.
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