@fsellet
The "D" and "P" styli are conical and can't reproduce extended frequency range as "F" (shibata type or line contact type) invented for quadraphonic records (Discrete-4).
So the "P" can't bring the quality of "F", the rest in marketing.
F9F frequency response: 10 - 60 000 Hz
F9P frequency response: 20 - 20 000 Hz
All those cartridges are from the 70's.
In the 80's Grace made much better cartridges and even their "disco" models were high-end (with beryllium cantilevers).
From the F9 manual: "Grace deems the F9D a playback standard and recommends it with pride to music lovers, audio enthusiasts and professional users."" The F9P satisfies the extraordinary demands made by professionals, while bringing the F9F quality"
The "D" and "P" styli are conical and can't reproduce extended frequency range as "F" (shibata type or line contact type) invented for quadraphonic records (Discrete-4).
So the "P" can't bring the quality of "F", the rest in marketing.
F9F frequency response: 10 - 60 000 Hz
F9P frequency response: 20 - 20 000 Hz
All those cartridges are from the 70's.
In the 80's Grace made much better cartridges and even their "disco" models were high-end (with beryllium cantilevers).