I really wouldn't describe that as a "modest" front end so I would think that there is something drastically wrong with the setup.
Unfortunately, the problem could be anywhere. From your perspective, I'd look at the easiest thing for you to deal with as a novice and that would be the settings on the phono pre. Perhaps the Jarrah's "high" setting is for high output cartridges, not low outputs like the Spirit. It would seem counterintuitive, but it would be easy for you to try the "low" setting (the gain and output of the Plinius/Spirit are well matched when using the low output MC setting, whether that is the "high" or "low") to see if that is the source of your problem.
This is, of course, assuming you have set Vertical tracking angle and Vertical tracking force properly once you have set the table up? Arm approximately parallel, at least to start and proper VTF towards the high end of the range suggested for the Spirit? Alignment is supposed to be a snap with the 309 if you have the supplied SME protractor.
The only other thing I can think of is if the cartridge leads have been incorrectly connected to the cartridge at the headshell, but that's probably something for a pro to tackle.
You'll end up with a zillion suggestions for things to look at here. Good luck! That setup should sound fantastic.
Unfortunately, the problem could be anywhere. From your perspective, I'd look at the easiest thing for you to deal with as a novice and that would be the settings on the phono pre. Perhaps the Jarrah's "high" setting is for high output cartridges, not low outputs like the Spirit. It would seem counterintuitive, but it would be easy for you to try the "low" setting (the gain and output of the Plinius/Spirit are well matched when using the low output MC setting, whether that is the "high" or "low") to see if that is the source of your problem.
This is, of course, assuming you have set Vertical tracking angle and Vertical tracking force properly once you have set the table up? Arm approximately parallel, at least to start and proper VTF towards the high end of the range suggested for the Spirit? Alignment is supposed to be a snap with the 309 if you have the supplied SME protractor.
The only other thing I can think of is if the cartridge leads have been incorrectly connected to the cartridge at the headshell, but that's probably something for a pro to tackle.
You'll end up with a zillion suggestions for things to look at here. Good luck! That setup should sound fantastic.