Thank you all for the suggestions.
Acurus,
Which Morrow Audios speaker cables you find outperform Heimdall? I'm currently using Heimdall ICs and was thinking of Heimdall speaker cables as well.
Keith,
I find my XA30.5 a little warm, liquid, smooth and seductive. I'd like to pair it with a revealing neutral cable that has some oophm for bottom end. How's the bass on A23?