Hey kw6,
Two points:
1) The F6 amplifier produces 50 watts into 4 ohms, the XA-25 when it was measured (Stereophile Review) produced 80 watts into 8 ohms and close to over 120 watts into 4 ohms-way over the very conservative rating done by Pass Labs.
2) I never comment out of ignorance. I have heard the Audible Illusions L3A, but never in my system or a rig that I have spent a lot of time listening to. I have had over seven highly regarded tube/SS based preamplifiers in my reviewing system and the Micro-ZOTL, with the right NOS tubes, still is the overall champ.
Two points:
1) The F6 amplifier produces 50 watts into 4 ohms, the XA-25 when it was measured (Stereophile Review) produced 80 watts into 8 ohms and close to over 120 watts into 4 ohms-way over the very conservative rating done by Pass Labs.
2) I never comment out of ignorance. I have heard the Audible Illusions L3A, but never in my system or a rig that I have spent a lot of time listening to. I have had over seven highly regarded tube/SS based preamplifiers in my reviewing system and the Micro-ZOTL, with the right NOS tubes, still is the overall champ.