7VEN Posted December 30, 2010 Posted December 30, 2010 As above, can anyone reccomend an internal sounder that can be recessed into the ceiling cavity? Kind regards
james.wilson Posted December 30, 2010 Posted December 30, 2010 Use a flush mount pa speaker securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount.
breff Posted December 30, 2010 Posted December 30, 2010 just make sure its 16 ohm, or use 2x 8ohm in series The opinions I express are mine and are usually correct! (Except when I'm wrong)(which I'm not)
Guest Oxo Posted December 30, 2010 Posted December 30, 2010 Someone give Jeff a shout I think hes sourced one for this specific.
7VEN Posted December 31, 2010 Author Posted December 31, 2010 Someone give Jeff a shout I think hes sourced one for this specific. Jeff, Thoughts?
james.wilson Posted December 31, 2010 Posted December 31, 2010 The Bosch LBC3090/31 is a 6w speaker that is flush mount but is only 4 Ohms. Many panels will drive 8 Ohms but not 4 securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount.
sixwheeledbeast Posted December 31, 2010 Posted December 31, 2010 The Bosch LBC3090/31 is a 6w speaker that is flush mount but is only 4 Ohms. Many panels will drive 8 Ohms but not 4 Maybe a 10 watt 12 ohm resistor in series, that would work.
james.wilson Posted January 1, 2011 Posted January 1, 2011 I'd have to calculate it. It's impedance we need to worry about here not resistance as such. As it's a dimension it would run 2 of these in series, but not 1 directly. securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount.
sixwheeledbeast Posted January 1, 2011 Posted January 1, 2011 I'd have to calculate it. It's impedance we need to worry about here not resistance as such. As it's a dimension it would run 2 of these in series, but not 1 directly. I understand your concern, it was a rough suggestion. Unfortunately is not easy to calculate the exact impedance of a circuit without the frequency ranges of the panel. Manufactures impedance is based by roughly guessing the applications freq. range anyway. But I was sure that inductors and capacitors differ between resistance and impedance but a resistance effects an AC wave the same as DC. Therefore I would be sure of getting a similar impedance although due to being a divider may roughly 1/2 or 5/8 the volume. Vo=Vi(R/(R+Z)) This is not recommended for PA or Music applications etc, due to loss in power equals loss of quality/output which is a waste. Alternatively running it through an audio transformer of correct impedance values.
reidy Posted January 2, 2011 Posted January 2, 2011 http://www.knightplastics.com/view_item.asp?id=41 Came across these if anyone's still interested Hey Ho, Lets Go
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