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Old 08-30-2015, 03:14 AM
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Default Best frequency for setting off alarms?

Set off an alarm yesterday at about 38hz (coincidence, just noticed because decaf)

Is it just about what frequency puts out the most decibels or is it more complicated and has more to due with cabin gain and alarm frequency sensitivity and stuff like that?
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Old 08-30-2015, 04:06 AM
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depends more on how sensitive car alarms are more than anything. I can play classical and set off a sensitive car alarm easily. While some cars have super numb alarms wont go off unless you actually break the window.
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Old 08-30-2015, 04:21 AM
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Quote:
Originally Posted by jeffdachef View Post
depends more on how sensitive car alarms are more than anything. I can play classical and set off a sensitive car alarm easily. While some cars have super numb alarms wont go off unless you actually break the window.
So basically just whatever frequency gives your setup the highest output?

I read a while back that some alarms were wired into the speakers and only go off when the glass breaks...I think it was due to the alarm monitoring the impedance of the speaker, which would change according to the sudden increase of pressure that breaking a window would cause. Is this true?

How do modern alarms sense a broken window? Decibels?

*Is there any bass in that classical or do you have your doors paneled up?*

Edit: it's probably your 2 18"s on 7k that does it.
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Old 08-30-2015, 06:11 AM
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38hz worked best on Keith davidsons wall(6 x12s in a cobalt)

He could set of a van alarm from 100 feet away
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Old 08-30-2015, 08:20 AM
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Quote:
Originally Posted by dirtrider View Post
38hz worked best on Keith davidsons wall(6 x12s in a cobalt)

He could set of a van alarm from 100 feet away
His is pretty loud though lol.
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Old 08-30-2015, 08:49 AM
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I set off alarms with my bike sometimes, and its not even that loud. I hate it when people have it set so sensitive. Like, why?

Are you looking to set off alarms?
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Old 08-30-2015, 09:43 AM
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It's all how sensitive they are
And the glass break sensor works off the sound glass makes when broken
You can put a pry bar in the top of the window and shatter the glass from the side easily without setting off the shock sensor but most good alarms will trigger from the noise the glass makes when broken

And as said some people set their alarms stupid easy, and some way too strong

I had a lady I put a motion sensor in her car and with an appropriate sensitivity, she came back the next day and she said put it as sensitive as it could be
She came back two days later because leafs would set it off I put it back how it was and she was happy
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Old 08-30-2015, 11:28 AM
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That seems to be close. In my smaller systems 36-40hz seemed to do it.

When I was walled I set one off around 29hz
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Old 08-30-2015, 11:38 AM
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a lot of people aren't loud enough at lower freq to do it.
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