I'm using Forte IV but eventually want a horn loaded bass cabinet like a LaScala or Vittori. The Forte IV sound really good with the Toolshed , will be even better with the 101d preamp.
I understand that direction. I'm more drawn to that than the class D powered woofer alternative. Admittedly nothing more than individual preference. Either one done right can be successful. That Toolshed DHT preamp paired with your 300b SET is going to be special in my humble opinion. Good decision.
Charles