Interesting! With NAP you can take advantage of the balanced output of the Atom HE or NSC-222. I’m now using one of the Atom’s few advantages over the Atom HE - bi-amping my B&W 705 Signature. The results are surprisingly good. I shared the experience in another post. Surprising results from bi-amping the Uniti Atom and NAP 250.2 with B&W Signature 705 - #6 by robert_h. I assumed the experience would be similar to what you heard with the 705S3. But the bass is definitely there because I use the 250.2 to drive the LF specifically. For my style of music, which is mostly jazz and small-scale classical (not symphony), the bass is never too weak. It would be nice to have all the different combinations at home to see what the best combination is…