For all the things that I have been trying on the nozzles, I also see that the foam piece improved a lot the timbre produced by the electropiezo beside taming down treble peaks. There's an increase in the mid section with the mod applied, which slightly modifies the timbre of the IEM.
I have forgotten to mention previously that I pushed the piece all the way down to the tip of the nozzle, aiming for to tame down only the high mids and high peaks.
Based on Audio-Heaven's explanation of the graph, the little boost on 500-1000 helps bringing forward the mids; I also sensed that comparing this other nozzles.
About the timbre, this is also mentioned in their web. Looking at the graph, the foam did quite flatten out after the boost from 500 to 2k.
I have forgotten to mention previously that I pushed the piece all the way down to the tip of the nozzle, aiming for to tame down only the high mids and high peaks.
Based on Audio-Heaven's explanation of the graph, the little boost on 500-1000 helps bringing forward the mids; I also sensed that comparing this other nozzles.
About the timbre, this is also mentioned in their web. Looking at the graph, the foam did quite flatten out after the boost from 500 to 2k.