magnetos

hello , i have 3 intellex dvms 16ch . i have a problem setting the alarm motion sound, when goes off i need an audible speaker or buzzer to say something its moving for all the camera or a specific camera. i try to use the output of the sound card of the system but i can only hear the internal speaker of the motherboard. i checked if the sound board was disable but is not but still no sound. can i use the alarm output to connect a buzzer or speaker. if yes how .