Ts would stand for technical sheet. In this site there's TL letters . The one your looking for is not on this site. It has to do with active crossovers and amplifiers.
There has been a lot of explanations on the Web.
The most popular active XO these days is the Behringer unit. It has all the slopes, EQ, GAIN ajustment.
Sorry about the TS-2 tech letter. Perhaps someone else has one copy.
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