Output transformer. Here is
what the thing become complicated. Of you drive ultra-low impedance with step
down transformer then your secondary turns will decrease. They primary will
have whatever they have for all case but secondary will go lover and lower as
load impedance drop and might even become foil-made. That is for sure will make
the transformer faster and better for transients BUT your need LF DSET
transformer it means you need inductance. As you will be losing your turn on
secondary you will be losing inductance and the only way to get it back would
be to increase the core size. You need
to put your transformer maker on the task and see if you will be able to obtain
a transformer core for half amper gap, no secondary turns and 5Hz at full
power. That will be a small refrigerator size piece of iron and it might be
very expensive.
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