Here's a suggestion. Ikea sells a plant stand in their Lack design line for about $US18. It is 17" high and surprisingly sturdy. I bought a pair to use with my Harbeth SHL5's as a starting point for deciding the exact height I wanted to order for a pair of Slylan stands. But the performance has been so good, I am in no hurry to get those Skylans. The 17" is pretty darn close to ideal, and I suspect it would be for the SP1 as well, which I think is about the same size as the Harbeth. The Ikea stands are remarkably good, really, and I highly recommend them, at least as a place to start. If it works with your decor, it may be all you ever need. If you want to move up, take a look at Skylan from Canada.
I found out about the Ikea stands on the Harbeth Users Group forum.
I found out about the Ikea stands on the Harbeth Users Group forum.