Invicta Dynamos beat Cardiff Devils 2-6 away and 10-3 at home to win 16-5 on aggregate.
Wightlink Raiders beat Bracknell Hornets 10-2 on aggregate (7-1 at home, 1-3 away).
Streatham Redskins were awarded a place in the semi final after opponents London Raiders were unable to ice a team for the second leg of their quarter final due to suspensions after the first leg was abandoned.
The semi final will take place next weekend with Chelmsford playing Streatham and Wightlink taking on Invicta over two legs.
Photo: Invicta's Callum Fowler in action v Cardiff Devils - by David Trevallion
