Here's what I found for you:
Project tonearm:-
9" tonearm
eff mass 11gms
overhang = 18mm
Kontra-A:-
12um/mN
0.45mV
weight = 10gm
It seems that the Kontra-A is a medium-low compliance cart. Since the Pro-ject 9 is a gimballed tonearm it should be able to take the Kontra-A w/o any problem. I think that the 11gms tonearm can take a 10gms cart. I calc. the resonance freq. to be 10Hz. You want to be in the 8-12Hz region with a preference towards the 10-12Hz region so that you can be clearly out of the record warp freq. region. This is using the dynamic compliance given on the Ortofon website. Compliance is freq. dependent so it'll vary over the audio band. Ortofon doesn't say @ which freq. the dynamic compliance is calculated but I suspect 100Hz.
From a theoretical perspective, it seems like a go. However, see if you can find another person who has actually heard this combination. That opinion is worth probably more. IMHO. FWIW.
Project tonearm:-
9" tonearm
eff mass 11gms
overhang = 18mm
Kontra-A:-
12um/mN
0.45mV
weight = 10gm
It seems that the Kontra-A is a medium-low compliance cart. Since the Pro-ject 9 is a gimballed tonearm it should be able to take the Kontra-A w/o any problem. I think that the 11gms tonearm can take a 10gms cart. I calc. the resonance freq. to be 10Hz. You want to be in the 8-12Hz region with a preference towards the 10-12Hz region so that you can be clearly out of the record warp freq. region. This is using the dynamic compliance given on the Ortofon website. Compliance is freq. dependent so it'll vary over the audio band. Ortofon doesn't say @ which freq. the dynamic compliance is calculated but I suspect 100Hz.
From a theoretical perspective, it seems like a go. However, see if you can find another person who has actually heard this combination. That opinion is worth probably more. IMHO. FWIW.