Visaton BG20 as woofer?

Hello, I have plan to build pair of speaker boxes and my priority was that speaker need to be efficient, so I made plan in Boxsim with 2x Visaton BG20, 2x Visaton SC13 and 2x Visaton DT94. Can that Visaton BG20 handle bass frequencies as I will not power them by amp which is more than about 30w? Also box I putted in Boxsim is 72 liters bass-reflex.
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Since you are looking at a 3 way design I was going to suggest the Visaton W series units. Take a look at at this design https://www.visaton.de/en/products/3-way-speakers/experience-v-20

That uses a very similar drive unit configuration and looks like it is quite efficient. 30 W should go plenty loud unless you have a big room. It is a little larger than your design at 96L though.

The PAW 25 and 30 are very efficient and you would only need 1 of these. Should be good for 500Hz.
 
Does it really has to be that Visaton BG20?
Because these days I would rather recommend the SB Acoustics SB20FRPC30-8 as a 8 inch full-range.

But to answer your question.
Yes, you can use these in a bassreflex cabinet.
It only needs a pretty large cabinet (around 80-100 minimum) and the xmax is extremely limited (just 2mm).
So you very quickly will reach that cone excursion limit. (about 2-3W actually)
 
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