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I had a FirstWatt F7 prior to my LTA ZOTL40. No direct A/B but IMO there is no comparison in the ability of the ZOTL to control my speakers (DIY Voxativ and Coherent Audio GR12's based on Radian Audio drivers). F7 was all great HiFi but the ZOTL just suddenly created a 3D presence in my room ...hushed silence, great dynamics, wide and deep stage. ZOTL also greatly benefited from my Nordost power setup and qKore grounding. If you can live with 35watts, the ZOTL is the best I have heard.
Bill all these years I never figured your forum name until I just saw the grannyring picture, and I am a avid bike rider. Anyway to answer your question I have heard the Pass XA25 in a friends system and I don't think it could get much better. My friend has now added the LTA Ultralinear 20 watt amp and he likes it better than the Pass. I have not heard the LTA but I trust my friends listening skills. Hopefully that might help.