“The latest CDM iteration adds tweeters from the Nautilus series, and the 9NT is a completely new top of the range, using 2 paper/Kevlar bass drivers, a woven Kevlar FST (Fixed Surround Technology) midrange, and the aforementioned NT alloy dome tweeter. The cabinet is front ported, and a plug for the port of cylindrical foam is supplied. In the manual this plug is described as a “bung”, so I guess we’d have to describe the port as a ‘bunghole’….”