I doubt 210L since your enclosures are quite tall at 90cm plus your enclosures will have to be very very deep (1 metre+) to accommodate the lengthy ports, or did you bend the ports?
Here are the exact measurements of the enclosures...
560mm W 920mm H 540mm D
The ports are bent hench why they are offset, and each is 106mm ID
Both units were made for me.
The Tumult driver is performing better than I anticipated; I had read a lot of other people’s posts, and the trouble I found was getting any real world experiences with the sound quality. David's original post was one of the reasons that inspired me to go ahead with the sub.
Just look at the posts for SVS & HSU subs, people post in room response charts, all have opinions regarding the sound etc, very little for the Tumult. I also realise there is different costs, enclosure sizes, & marketing involved.
I went out on a limb when I ordered the sub, but figured if it did not sound all the good for music I would just have it adding extra SPL's to the bottom octave for HT.
All I can say, you will not be disappointed if you go with a Tumult.