Designed specifically to compliment the TM and IM series of speakers (but not solely, of course!) the PA range is packed full of features normally found in much higher priced amplifiers. With the exception of the PA600 , the PA range all feature an on board 2 way crossover and each channel can be assigned to the high or low signal output. This gives separation in the signal path to deliver low frequencies to the sub and high/mid frequencies to the top speakers. The amplifiers have full protection circuitry; both DC and thermal overload protection. Each amp can be run in bridge mode. When Bridge is selected, it is indicated on the front panel. The inputs are via combination sockets, allowing use of both ¼” jacks or male XLR's. There is also a link out via female XLR to enable more amps to be connected together. Similarly the crossover has a link out via ¼” jack. Another feature of the PA series is the 35Hz filter switch. As the name suggests, this prevents (sometimes) harmful ultra low frequencies from reaching the speakers, thus keeping the low end sonically tight and warm.