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distributed / wireless speakers

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Magnus Soderman:
Hello !

i have got a question of a bgm project
during december . Yes you guessed right,
its christmas music. the thing is , that the possible client
wants the sound to be along a looooong walkway.
i guess around 1,5 km.
One solution could be a distributed speaker system
with amps in electrical cabinets along the way or
some kind of wireless meshing speakers.
Does any of you an idea of a wireless system like this ?

thanks in advance

magnus, sweden

Mike Caldwell:
How many speakers spaced out along what will be just under 5000 feet?
Depending on the speakers and what is considered to be background level
a tap setting around 6 watts may be plenty.

I'm going to say with larger gauge cable and two big amps driving the system, one at home base and another about half way you could do it all hardwired.
Use a transformer at the midway break point to feed the input of the second amp.

Do they have a budget?

Caleb Dueck:

--- Quote from: Mike Caldwell on October 15, 2020, 07:29:25 PM ---How many speakers spaced out along what will be just under 5000 feet?
Depending on the speakers and what is considered to be background level
a tap setting around 6 watts may be plenty.

I'm going to say with larger gauge cable and two big amps driving the system, one at home base and another about half way you could do it all hardwired.
Use a transformer at the midway break point to feed the input of the second amp.

Do they have a budget?

--- End quote ---

Agreed, sounds like a great place for a 70v/100v system.  Even a single large 4ch DSP amp in the center could do it with good thick wire. 

Wireless would cost more, require a ton of electrical, and sound worse.  Did I mention cost a lot more?

Mike Caldwell:
I'm guessing you'll want to figure on around 125 or so speakers to cover that distance if there looking for a seamless background of Christmas music as you would walk that path, if that is the intended purpose.

If it works to have the amps and even the music source in the middle of the run I like that idea the best. Speakers are the far ends of the line could have the tap setting bumped up
a little to make up for line loss if needed.
A couple of amps like a QSC RMX 1450 or 2450 bridged (depending on final power needs) would drive each run.

Actually I have use some of the Crown XLS amps bridged to drive 70 volt systems.
The built in DSP lets you dial up a quick high pass filter as well.
 

John Roberts {JR}:

--- Quote from: Caleb Dueck on October 16, 2020, 02:41:23 AM ---Agreed, sounds like a great place for a 70v/100v system.  Even a single large 4ch DSP amp in the center could do it with good thick wire. 

Wireless would cost more, require a ton of electrical, and sound worse.  Did I mention cost a lot more?

--- End quote ---
+1  constant voltage (70/100V) will reduce wire losses...

I have seen very long (miles) speaker runs executed with stacked 100V transformers for even more voltage and less losses.

JR

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