@westcoastaudiophile :No it is not ( at least in my system ) and obviously the use of subsonic cut-off filter is not necessary . Btw,all those AT cartridges runs according the AT spec in capacitance:100pf-200pf range.
Yes the 170and 180 are truly good motors and overall with an excellent quality level performance and NO the 160 does not beats either but even some characteristics and the 160 low/deep bass is a little better that's all.
R.