[Elecraft] Mildly confused - Assumed filter width and what I see in waterfall do not match

[Thomas Bingenheimer]

I have been using several programs (Cocoamodem, mostly) to do PSK31, via Data  A. Instead of being able to use the full 4khz waterfall bandwidth available in, say, Cocoamodem, I have been limited to the available width in the only filter I had in the rig, the 2.7 khz 5-pole appeared to limit me to about 2.7 khz. So, I added the 6 khz filter, set it up for SSB (and enable ESSB, 4.0 khz). I now show 3 khz (500 to 3500 hz) in the waterfall. I suspect I have overlooked something, but it is not clear to me what. Does anybody have any idea? Thanks!