While I have no answer for you, from your previous posts. It look like you are only you are looking only for a driver (woofer) to do your own sub. You may have more reply in this thread;Iam really so much happy, that I found this forum! Can somebody tell me, what is MaxSPL with GR SW-12-04? I want to use it in sealed box about 40 liters (1.5 cuft)...
This area is for people that like to build your own speakers and subs. Share ideas and get the most out of what you do.
I would make sure to include, this link for the woofer you are looking at;
For an answer and/or other recommendation for drivers, since you live oversea for a cheaper option. Since Rythmik include all cost in their price, including shipping/ taxes, duty that can add a lot to the price. You might have better options, living in Slovakia.
While been a very proud owner of two FV18, I think the link to the DIY section, that I have provided. Would be in your best interest, and glad you found this forum.