ID prove the panel first before deciding its at fault. If you discconect all wiring and put the relevant resistors accross the circuits are they still in fault.
If your planning on using this to activate the alarm i would advise against it.
But you could use an optex or takex infrared beam instead on your panel
Id have to check the docs but that will be about right. It wont be anywhere near 1A
You will need to series your tamper returns and HO-ve and not connect the bell trigger on the second unit
HI
1. Sales would be best for that.
2. Not to close to distort. Just practice a few times to get the ideal distance and volume for your voice. Id say about 15cm
3. The only way to do this is to walk test each correctly and adjust