Traditional overhead paging systems are a little more complicated than they first appear. It's not just speakers and a centralized amplifier. They would have too much cable loss if done that way. Instead, they use a centralized power source, and amplifiers at each speaker unit.. The one I just took apart used 3 wires in series to the overhead speakers, and each speaker unit had an independent volume control and an onboard transformer on the unit. One of the wires (black) carried 60V. Green was ground. The last wire (smaller than the rest) was the audio signal. The audio signal ran into the transformer and modulated the 60V signal, and the output went to the speaker. Neat contraptions. Don't hurt yourself.
-ejay > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Chris Shaw > Sent: Thursday, August 26, 2004 5:35 PM > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [Asterisk-Users] Overhead Paging > > ----- Original Message ----- > From: "Brian Pavane" <[EMAIL PROTECTED]> > To: "Chris Shaw" <[EMAIL PROTECTED]>; "Asterisk Users > Mailing List - > Non-Commercial Discussion" <[EMAIL PROTECTED]> > Sent: Thursday, August 26, 2004 2:39 PM > Subject: Re: [Asterisk-Users] Overhead Paging > > > > Chris, > > > > What you're talking about is exactly what I'm looking for. > I'm interested > in > > the middleware that would sit between the speakers and the > IAD. I have > found > > the Bogen TAMB device -- however I was wondering if anyone had any > experience > > with this box. How many speakers can you power off of the > unit without > needing > > an external amp, etc... > > > > -Brian > > lol those would be electrical questions... Not sure how to > answer those, it > would depend on power output of the TAMB device and how much > current draw > and wattage the speakers require... I know this would work > though, as long > as the receiver/amplifier has an FXO interface and not an RCA > jack like you > would find on a stereo system or CD player... > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
