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Thanks for the advice. I downloaded other DVR manual similar with i have. it suggests same method. i connect the (+) from power supply to the alarm port, the (-) from PS to siren (-), and siren (+) to another alarm port. n the siren sounds loud . for the sensor input, i installed 5 motion detectors. and i'm planning to move one of my panic button from alarm panel to the dvr. the panic button have only two wires. what i have in my mind is to install the panic button similar to the siren ? am i right ?

Thanks. But i already try a relay. The relay has + and - port (for power i guess), and NC, NO, and Com port. I connect the + and - to the power source, but i'm little confused where to put the black and red wire from the siren. So, i connect the red wire into NO/NC port and the black wire to Com. Still no sound. Should i put a resistor in the siren like i did when installing alarm sensor ? Than i try without a relay. from the power source i plug the + wire to + port in DVR alarm output, and the - wire to the siren, than to - port in DVR alarm output. Still no sound.

Hi All, I'm a newbie and really need help to connect siren to DVR. My DVR has 8 sensor input and 1 alarm output, i supposed it should be + and -. When i directly connect the wires ( two wires siren) to the output port, there was no sound at all. Than i use external power supply and try a relay too, but still no sound. I'm sure there's no problem with the siren, because when i connect it to alarm control panel, it working well. Thanks...