misleading ohms law speaker current draw

[calum95]

hi there, i have been searching for answers on alarm 16ohm speaker current draw with no luck so id thought i would ask you experts. i have an elmdene 16ohm 20 watt speaker on my 9600 alarm and im at a loss at how current it draws. the ohms law is very misleading it says the speaker draws 750ma! which is alot for a burglar alarm, how much current does a typical 16 ohm alarm speaker draw from a panel. i cannot measure it i do not have a meter to check, can you guys shed any light or give rough answer searching on google for this answer is like banging your head against a brick wall. so from your guys expierience how many milliamps do internal speakers draw from a panel. any feedback would be great thanks

 

[bernardgreen]

The impedance of a speaker is not the resistance of the coil measured with DC.

Your 16 ohm impedance speaker may be only a few ohms at DC

The 12 volts is not applied directly to the speaker ( or least it isn't in a properly designed item ) as this would damage the speaker.

The current in the speaker is determined by the voltage the amplifier ( or noise maker ) applies to the speaker and the impedance at the frequency of the applied voltage. The voltage may be only a couple of volts to produce a loud enough sound.

One watt of audio power is more than enough to make a noticable noise in a panel sounder.

Assume the sound is at the frequency at which the speaker's impedance is 16 Ω then using I ² = W /R ~~ I ² = 1 /16 amps

I = 250 mA

 

[Europlex]

Hello stranger, where have you been? Not seen you here for a while.

 

[bernardgreen]

Hello stranger, where have you been? Not seen you here for a while.

I've been around. Not so active on line though as the cottage renovation and relaxing are my top priorities.

 

[calum95]

thanks so around 250ma that doesnt sound to bad cheers

 

[calum95]

sorry forgot to mention the 9600 siren terminals (speaker) is 13.7v if that helps in anyway and my speaker is a elmdene 16 ohm 20w speaker thanks. also not relevant but curious will 1125ma be fine on 9600 alarm on alarm mode? thanks

 

[sparkymarka]

No it's going to break

 

[calum95]

 

[calum95]

so is my elmdene 20watt 16ohm speaker drawing 250ma on the 9600 or were you just giving me an example again the panel voltage is 13.7v if that helps cheers

 

[Europlex]

Hello stranger, where have you been? Not seen you here for a while.

I've been around. Not so active on line though as the cottage renovation and relaxing are my top priorities.

Your 'corner' problem solved?

 

[bernardgreen]

Your 'corner' problem solved?

Improved signage has reduced the number of oversized vehicles on the lane. Also a few drivers have been cornered and ""advised"" about what a width restriction really means.
So getting getting there slowly

 

[OwainDIYer]

you can only connect your speaker to the internal speaker output.

you cannot connect it to a DC siren output. For that you need a ... siren.

 

[calum95]

the 9600 internal speaker output is marked siren. so what does this speaker draw i have already gave you the information thanks

 

[Bodgeitandleggit]

The impedance of a speaker is not the resistance of the coil measured with DC.

Your 16 ohm impedance speaker may be only a few ohms at DC

The 12 volts is not applied directly to the speaker ( or least it isn't in a properly designed item ) as this would damage the speaker.

The current in the speaker is determined by the voltage the amplifier ( or noise maker ) applies to the speaker and the impedance at the frequency of the applied voltage. The voltage may be only a couple of volts to produce a loud enough sound.

One watt of audio power is more than enough to make a noticable noise in a panel sounder.

Assume the sound is at the frequency at which the speaker's impedance is 16 Ω then using I ² = W /R ~~ I ² = 1 /16 amps

I = 250 mA

Bernard a fountain of knowledge..

 

[calum95]

so it draws 250ma then, yes or no? thanks