一只电子PTC电阻在扬声器出现过载时自动限制输入扬声器的功率。当音量再次调小时，电阻冷却下来，声响又恢复到正常的电平。
 

At Jamo, we design all our loudspeaker units in-house.This means individual units for exact purposes and units that complement each other perfectly, thus reducing the need for complex crossover filters with various compensation circuits. Limiting the number of components in the filter also reduces Its power consumption (an overly complex filter can easily consume 10 - 20% of the power supplied).The advantage of lowloss x-overs is clearer, cleaner sound reproduction, as well as lower distortion and higher sensitivity.

Normally when placing a loudspeaker close to a TV, the magnets of the drive units will cause discolouration of the TV picture. Therefore centre channel speakers – which in order to achieve best possible coherence between picture and sound, need to be placed as close to the TV as possible –must feature shielded magnets to eliminate the disturbing magnetic radiation.