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RE: "...the source Z is truly awful..."

What I mean is that designs using this concept generally do not maintain a low output Z over frequency. The problem appears due to both L/C resonance(s) and insufficient output capacitance. The latter appeared to be a particularly acute problem in the versions I SPICE'd, and practical designs with a reasonable number of filter sections are prone to generally high levels of ripple. I posted SPICE analysis here, including graphs, on at least two occasions in the past. Each was the result of a "Low DCR" power supply that was represented to this forum as being wonderfully innovative and sonically pleasing. Both designs were functionally deficient and unsuited for most purposes relating to audio power amplifiers.


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