Hi im designing a complex system, although the sound side of things is uncomplicated, however its only a single zone amp and i wish to split the classroom into two areas in respect of the ceiling speakers (100v), -the system will have a central controller and touchpanel- i have four spkrs in the main area which will more or less be active all the time, there are a further two speakers that i wish to isolate, can i run a feed from the last of the four into the relay port of the central controller then program the system to close the relay thus activating the isolated two speakers, if this is the way to go...... do i have to make it all in series? or (saving cable runs here...) can i run a separate feed to the relay and have in effect 4 speakers in series with a further 2 in parallel switched via relay?Hope im making sense ppl!!Thanks for looking.M
Since you are running 100V line (I assume you are licensed to run HIGH voltage?) parallel is the simplest and least complicated way.
One three occasions I've tried to use relays to switch speaker-level audio and all ended in disappointment when the contact resistance went up over time.
One three occasions I've tried to use relays to switch speaker-level audio and all ended in disappointment when the contact resistance went up over time. Aware of this, the third time, I went through some effort to select a relay with gold plated contacts, low specified initial resistance, and a 5A current rating. It still had problems after a while.I guess speaker audio falls in a middle ground where the current is high enough to require a "power" relay but not high enough to weld the contacts on each closure, which is how power relays achieve low on-resistance. Maybe there's a good relay out there (can't get the Hg-wetted ones anymore), but I haven't found it. I stay away from relays now.--Frank
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