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Re: List of speakers suitable for OTL amps.

I hesitate to disagree slightly, but in my experience with Sound Lab M1s, they have a dip in impedance to about 4 ohms at 500Hz and then go down as low as 2 ohms at high frequencies. I found a tremendous benefit to using Zeros with my MA240s (about the same power as MA1) driving M1s. Without Zeros there is a noticeable midrange "suck-out". With Zeros, it's "all good". Also, Apogees and Magneplanars?????? These are 2-ohm and 4-ohm speakers, respectively.

Somewhere I once read in Paul's writings that the Zeros were designed to work with amps producing up to 150W. When one uses Zeros with MA2s (rated at 220W) or other high power tube amps, do the Zeros themselves limit the power made available to the speaker? I once queried Paul about building a pair of "high power" Zeros, but he never responded.

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