ZYX Compilance

I'm currently using the ZYX Universe II Silver base (8.2 gm) w/ the Kuzma 4P (effective mass - 13 gm). Also had it with Cornet 2 tonearm (effective mass = 12.5 gm).  Worked well with both tonearms.

I found this on Vinly Engine can anyone confirm 

Zyx is a Japanese maker and Japanese makers usually specifies their compliance at 100 Hz, so if we say a static compliance of 15 @ 100 Hz, this means a dynamic compliance of roughly 7.5 @ 100 Hz. Now, to convert to 10 Hz we use 7.5 x 2 or x2.2 and get 15 or 15.4. So a static compliance of 15 @ 100 Hz is roughly a dynamic compliance of 15 @ 10 Hz.

@dolphytrane forget about static compliance, only dynamic compliance is what we need to choose the arm. Vinyl engine is a source with a lot of misinformation when it comes to data. ZYX dynamic compliance is 15cu (horizontal) and 12cu (vertical), both measured at 100Hz.

To convert it to 10Hz we have to multiply on 1.7 (not on 2.2).
So everything you have written is wrong. Where did you get your data, do you have ZYX cartridge ? I have original manual on hands from my ex ZYX Premium 4D SB. Static compliance does not even mentioned in the original printed manual for ZYX (because nobody need it).

at 10Hz ZYX compliance is about: 
25.5 cu (lateral)
20.4 cu (vertical)

This is medium dynamic compliance and it’s quite normal for a modern LOMC. This is the reason why ZYX is fine for most of the modern tonearms.

@chakster
I do have a Zyx cartridge & in my manual it simply says 'Compliance' it does not state whether it is Dynamic or Static or what it is measured at either 10hz or 100hz, hence the reason for starting this topic.
If the compliance is how you have calculated at 25.5cu & using your ETA arm, according to the manual its effective mass is 22g with a 6.5g cartridge, I don't know the weight of your 4D but my cartridge weight with SB is 7.9 so this would increase the mass with the ETA to 23.4g using the calculation in the article link by rdk777 we get an RF of 6.5 it is also stated in this article that the desired range is 9-11 so your combination is well outside the range.
rdk777 states' I'm currently using the ZYX Universe II Silver base (8.2 gm) w/ the Kuzma 4P (effective mass - 13 gm)' if we use these figures to calculate RF we get 6.8 another combination that works well according to rdk777 but is well outside the range.
If your cartridge is working well in your ETA image how much better it would be in a low mass arm. If we aim for an RF of 10 right in the middle of the desired range using your calculation of 25.5 compliance & my cartridge weight of 7.9g I would need an arm with effective mass of 2.1g.I would really appreciate your recommendations of an arm in this range.

I agree - seems like the calcs aren't coming up with the right values or ones that make sense.  I've attached a link to a thread where GT Audio (I believe is the UK Rep for ZYX) says that ZYX recommends tonearms with effective mass of 12-20 gms - which puts it in the medium mass tonearm range.

https://pinkfishmedia.net/forum/threads/zyx-compliance-10hz-or-100hz.195170/