Re: Public address system
- From: Joerg <invalid@xxxxxxxxxxxxxxx>
- Date: Wed, 07 Oct 2009 16:30:06 -0700
Jim Thompson wrote:
On Wed, 07 Oct 2009 15:55:52 -0700, Joerg <invalid@xxxxxxxxxxxxxxx>
wrote:
Jim Thompson wrote:On Wed, 07 Oct 2009 15:31:00 -0700, Charlie E. <edmondson@xxxxxxxx>120ft? That must be one heck of an entertainment room.
wrote:
On Wed, 07 Oct 2009 13:26:46 -0700, Jim ThompsonI have actually considered rolling my own powered speakers, simply
<To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx> wrote:
On Wed, 07 Oct 2009 13:16:16 -0700, Charlie E. <edmondson@xxxxxxxx>Hi Jim,
wrote:
On Wed, 07 Oct 2009 21:55:57 +0200, Andrew EdgeMaybe the OP means powered speakers, as in locally powered, signal
<a_n_d_y_e_d_g_e@xxxxxxxxxxxxxx> wrote:
Hi to everybodySorry, but your question does not compute. What voltage? What
I'm designing a public address system for a work place .The
loudspeakers I'm using have an internal amplifier and use up to 25W at maximum power. I'm wondering what specs to look for the power
supply which will power the speakers. Apart from the total power
which should be about 100W for each position as they will be about 2-4
speakers ... what type of Power supply? SMPS , linear or mixed? What
S/N , distortion figures should I be asking from the supplier? What
other specs are important.
Thanks to all in advance.
Martin.
current? What source are you using? If you are an engineer, you must
be either in software or digital design... ;-)
Charlie - who has designed many PA systems and never used power
speakers!
passed at line levels?
...Jim Thompson
I assumed that. But, it is so much easier in a PA situation to have a
single power amp, and have multiple un-powered speakers, that only a
newbie or amateur would even consider it. If he has many stations, he
just uses 100V or 70V transformers for the line. To have a powered
speaker at each location means you have to have separate power
supplies at each location, or run a power feed with your audio feed,
unless you get really crazy and decide to run power over the audio
line! 8-)
Charlie
because it offends me to have amplifier damping on the end of 120' of
zip cord... rear speakers are that far from my present amplifier ;-)
24' x 24' room x 16' ceiling. Ceiling/roof structure forces going
around the south side of that raised area using the attic over the
entry court then back over the master suite :-(
Euww ...
Might want to invest in shielded CAT5 then, depending on whether you must cross paths with some huge mains trunk. And keep the code distance from that ;-)
For me, local power would be trivial.It becomes non-trivial in public buildings because the fire marshall and his opinion is law. If he thinks something looks odd it gets written up no matter how safe it is :-(
Luckily he wasn't there when I hauled in my electric saw and connected it via a cable that had a NEMA plug on one end and a Euro outlet at the other.
Signal via a current loop to avoid ground issues.Just do diff pairs with true line level (or more) and you'll be fine.
I tend toward the Greek approach ;-)
But this is America ...
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
.
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