Never heard the SL, but the big brother soloist does a damn great job driving the HE500. I like it slightly better than the Lyr when both are run off the Bifrost. Lyr can generate more sub bass, but the Soloist beats it in overall clarity, soundstage, detail retrieval.
Can't say for certain about the SL, but it does carry the Soloist genes, so to speak. So I infer it should do very well for you HE500.
Edited by NZheadcase - 11/2/13 at 11:16am