Well…my latest update. And in case anyone really wants to know if speaker cables will make a difference to a Sprout based system. I can answer that question: YES!
After upgrading to the Elac Uni-Fi 2.0 UB52 bookshelf speakers, the quality of my sound made a big leap. I will admit though, connected via a set of Sewell Silverbacks, I would hear a harshness to the top end. I thought that was attributed to turning up volume too much and pushing the Sprout too hard.
I then made the move to the Blue Jeans BJC 10 white speaker cables. And things changed. The top smoothed out very nicely. The bass, already feeling quite solid to me improved. The mid range also filled out. I can really push the volume now and there is no harshness. Just really amazing sound.
I have been playing around with speaker placement (I admit, I have an awkward space to work with) and the soundstage depth is really amazing. I swear, the front wall (or back wall as @Paul refers to it) is disappearing for me with good recordings.
I want to thank all the members of this forum. Reading all these posts is most educational. I have come such a long way from that first day I unpacked my Sprout from its box.
Next: going to work with Paul’s new book and CD to further tune my speaker placement.