Yes, the FW M2 definitely handles the bass better. I readily admit that the Zu Omen and their odd 12 ohm impedance may be the problem. Hindsight being 20/20, I'd probably spring for the Zu Defs which present an easier 8 ohm load and 101 dB/w efficiency. However, the M2 controls them well and the LP-2 preamp warms the sound nicely. The Inspire plays louder than the M2 - a 2 or 3 o'clock listening position on the LP-2 & M2. Noon or 1 o'clock was the norm with the LP-2 and Inspire with vintage Tungsol 6550's. The M2 has more than 2x the power, but Dennis' amp has more real output. I'd say the Inspires are "conservatively rated".
That said, Nelson says the M2 is for tube amp lovers - and so far I tend to agree.
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