It is a bit of an odd thing when duties apply and do not since our relatively new Tannoys (British built) came from the States (California) and we paid no duties.
Taxes yes, duties no.
I'm thinking there might be a difference b/c they were used and not new.

In any event, the original quesiton regarding Hsu or SVS subs should be "no", there should not be any duty charges.

"Those who preach the myths of audio are ignorant of truth."