That would match the impedance, but the higher the wattage the higher the current draw from the panel, some alarm speakers are as low as 0.25 watt.

38553[/snapback]

I am not specialist in audio equipment but as far as I know if the impedance is 16ohms and the feeding voltage is 12V the power consumption doesn't exceed 9Watts regardless the power rating of the loudspeaker.

V=IR and W=VI

With V=12 and R=16; I=0.75

So W=9.

Georgahti is 100% correct, but what does it prove?

V=IR and W=VI

With V=12 and R=16; I=0.75

So W=9.

Georgahti is 100% correct, but what does it prove?

38569[/snapback]

Nothing necessarily.. And in this case we are talking about impedance which is Z (R+C+L). Basicly formula is the same Z=U/I (Z=V/I).

what it does prove is that if you have 1 megawatt 16ohm loudspeaker it still draws approximately 750mA when fed by 12V..

Could I use a couple of these in series, to give the correct impedance.

Either the top ones or the 5th ones down.

https://secure11.easyspace.com/www.strachan...peakers_45.html

38521[/snapback]

These speakers are designed for PA systems and as Peter has already pointed out, PA systems run on 100v. Your alarm panel will push 12v at best to your entry speaker................

So is that a yes or a no

I noticed that it said they were suitable for PA but could not see anywhere where it said they were 100v. Most sites state 100v if thats what they are. I guess they left that off here if anything used for pa is definately 100v

So is that a yes or a no 

38597[/snapback]

Well if they normally require 100v i would say thats a no from your alarm panel.

I would think you would get something but it would be so quiet, thats if you could hear it at all.

I noticed that it said they were suitable for PA but could not see anywhere where it said they were 100v.  Most sites state 100v if thats what they are.  I guess they left that off here if anything used for pa is definately 100v

38599[/snapback]

I do a bit of PA but know little about the technical side, basic electrical theory tells me no. Ive got a few speakers in the shed though......... if i get 5mins i will try it out.

Thanks

If they are 100V PA speakers just disconnect the transformer.