The Programme 30 uses Wharfedale proprietary bass units with fabric dome tweeters to produce extended bass, even at high volume levels and a smooth high frequency response. The crossover features TOP™ (Tweeter Overload Protection) while allowing a full 100W of power handling. The 30T version incorporates a 100V line transformer with taps for 10, 5, 2.5 and 1.25 watts, selected by using a rear panel switch.