Originally Posted by moray james
the auto transformer in the CF3&4 are used to stet up the signal to boos HF response. More than that I cannot say. Best regards Moray James.
I'm still unsure we're talking about the same thing.
auto-transformers usually allow to vary the level starting from 0dB and adjusting to minus 2dB, minus 4dB etc. If switching back from minus 4dB to minus 2 dB means increasing, then OK.
Again, I have inverted my autotransformers so that the nominal 0dB is increased by +1,5 dB, +3dB etc. up to +7,5dB (multiple taps allow up to +15dB but it becomes dangerous for the amp), i.e I am boosting the original signal to increase the response in the UHF, where most 2" drivers drop off normally.
Cayin CDT17A, passive box (ladder resistors rotary volume control), Crown SR1, OnkenW (bass)+JBL2392/2490H (mids)+JBL 2445J/custom-made cheek-butt horn (trebble)