I have Ref II's also. I would be interested in what others have done too.
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The modification of the Gallos was done by InSound/Mapleshade.As I understand it,the resistor has been removed and there is an undisclosed capacitor to level-match the CDT.The CDT is brought forward to approximate similar wave-launch using a first-order filter.
I had purchased extra Dynaudio drivers and was experimenting with tweeters to match.That is when I discovered the Fontec.The bottom right photo (system post) is of the Fontec/Dynaudio combo.The tweeter requires an L-pad,as it is 98db efficient.Capacitor selection is crucial.
If you are able to mount the Fontec 7/8" back from the surface that the Dynaudio is mounted,you should be in-ohase with them.