jdm
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River, thanks for your comment. Since my previous posts, I have received my Mini Toriis and I am very happy to have the feedback adjustment. I also just previously replaced my MG944 speakers with DNA2. My CSP2/Taboo combination was having a difficult time balancing and taming the midrange - my DNA2 has the midrange/phase guide option. My options were room treatments and tube rolling. The room treatments improved soundstage and transparency. Tube rolling (rectifiers had the biggest impact) improved balance and musicality, but the mids were too bright and harsh.
Swapping out the CSP2/Taboo with the Mini Torii made all the difference. With the feedback adjustment on full (full clockwise rotation) the sound is deep, a little muddy and treble deficient. Each click counter clockwise brings more detail and treble. The sweet spot seems to be 1 or 2 clicks. The third click makes it too bright and the midrange of the DNA2s start to sound like they did with the CSP2/Taboo. So, for me, 1 or 2 clicks off of full feedback tamed the DNA2s midrange that the CSP2/Taboo could not.
My Mini Toriis have a headphone/speaker switch which makes switching back and forth really quick. I find that my 250 ohm headphone (DT880) has a slight hum on the feedback setting my Trapezium speakers like, and increasing the feedback 1 click eliminates that hum. The other Mini Torii feeds 600 ohm DT880s and they like the same setting as as the DNA2 speakers.
My experience in using the variable feedback is that it offers an additional method of tuning the amp to the rest of your system.
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