Commercial Sound

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Commercial Sound

Postby oddioguy » Sat Mar 03, 2007 1:51 pm

I expect this topic will be slow, to say the least, but any and all inquiries regarding commercial distributed audio are welcome.
I probably won't be posting much in the way of "how to" here, as I doubt there is much interest, but it is very much part of the audio world.
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Postby Alain Benoit » Sat Mar 03, 2007 9:01 pm

Is 70 volts enought to kill you? :twisted:
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Postby oddioguy » Sun Mar 04, 2007 7:27 am

U1176 wrote:Is 70 volts enought to kill you? :twisted:

Why yes...yes it is. That is why you must leave the installation and repair of these systems to ME! :lol:
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Postby Radio man! » Tue Mar 13, 2007 1:03 pm

I personally prefer the High Power, Single Point method of distributing audio commercials :lol:
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Postby oddioguy » Tue Mar 13, 2007 1:17 pm

Radio man! wrote:I personally prefer the High Power, Single Point method of distributing audio commercials :lol:

All you radio guys are the same... ;-)
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Postby oddioguy » Wed May 02, 2007 3:46 pm

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Postby oddioguy » Thu Aug 16, 2007 6:43 am

My boss and I just pulled off a bank job.

Pics up soon.
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Postby oddioguy » Sat Sep 15, 2007 9:29 am

Day one:
We arrived and set up camp. A Genie lift was graciously supplied for our use,
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so we got to work removing the old speakers... seen here from 25ft below.

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Postby oddioguy » Sat Sep 15, 2007 11:25 am

Base camp #1 - We took over the cloak room for tools and supplies.

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Postby oddioguy » Sat Sep 15, 2007 11:27 am

Taking down the original speakers...

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Postby oddioguy » Sat Sep 15, 2007 11:32 am

Our plan was to retrofit the new JBL speakers into the existing holes. Whereas the new speakers were smaller, I thought I'd make use of the old grills as trim rings, seeing as they were already painted.

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Postby oddioguy » Sat Sep 15, 2007 11:34 am

....but as you can see, the old plastic grills were so brittle that an accidental bump cracked the first one that I had assembled...

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Postby oddioguy » Sat Sep 15, 2007 11:36 am

Time for Plan B.

I ran down (okay....I drove...) to my favourite electronic supply shop and picked up 6 metal grills. I then cut the centres out of them to make new trim rings.

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Last edited by oddioguy on Wed Oct 03, 2007 9:05 am, edited 1 time in total.
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Postby oddioguy » Sat Sep 15, 2007 11:39 am

The old back boxes provided much needed support in the drywall ceiling, so I cut the backs off of them to accommodate the new deeper JBLs.

Never did get a pic of that particular operation.
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Postby oddioguy » Sat Sep 15, 2007 11:40 am

Then we slapped all the new speaker assemblies up into the ceiling.

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Postby oddioguy » Sat Sep 15, 2007 11:42 am

We supplied a nice Middle Atlantic rolling rack...

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Postby oddioguy » Sat Sep 15, 2007 11:43 am

With an optional smoked glass door...

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...and loaded it up with:
1) Shure ULX hand held wireless
1) Tripplite surge suppressing power strip
1) Spare rack shelf
1) JVC 5 disc CD player
1) Behringer (moist PRO) feedback exterminator
1) Crown 1160MA commercial amp

Sounds great and will last for years.
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Postby oddioguy » Wed Oct 03, 2007 9:02 am

Since the original install, we were called back to add a 2nd mic input so guests can plug in an addtional wireless or wired mic, as well as a line out for media box feeds or whatever.
They also added a lavalier mic, and may soon want a 2nd wireless installed.
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Postby oddioguy » Fri Nov 09, 2007 1:55 pm

Back yet again to add a 3rd mic level input. That's it...we've loaded up the inputs on the mixer/amp.
Next logical step would be a rack-mount mic/line mixer....if it ever comes to that.
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Postby oddioguy » Thu Nov 29, 2007 8:13 pm

Did another retail install last night.
All the hardware was provided, as these clients are want to do, so we showed up with wire and tools.
When we were approached for this job, it was made clear that we would receive speakers (8), a residential type tuner/amplifier, and a speaker selector switch. We would then make 8 home runs from the individual speakers back to the selector switch, and finally tie the whole mess to the amplifier.

Fuck that.

I proposed to my employer that we bring 3 conductor wire and tie the speakers in 2 home runs of 4 speakers each in a series parallel configuration. End result is the same...amplifier sees 8 ohms...all is well in the cosmos.
This would result in less material cost, less labour cost, and the client can recoup the cost of the speaker selector.
Long story short, 5 and a half hours later we have a fully functioning flush mounted in-house music reproduction system.

This morning my employer drops by the site to ensure that all expectations have been met or exceeded:

Foreman - "Where's the speaker selector?"
Us - "We didn't need it."
Foreman - "What do you mean you didn't need it?"
Us - "We wired the speakers series/parallel."
Foreman - "Oh...but every other *name* store has a speaker selector."
Us - "Wait...I'll call Montreal and see what they have to say."

*dial dial...ring ring*

Montreal - "What do you mean you didn't need it?"
Us - "We wired the speakers so that the amplifier sees 8 ohms, without the need for a speaker selector."
Montreal - "How did you do that?"
Us - "Series/ parallel."
Montreal - "What?"
Us - "With 4 speakers per side, you can wire them so that the amplifier sees the correct load."
Montreal - "But the speaker selector is part of the package. You have to use it."

So we did. We inserted the selector between the amp and the speakers. We did not run any additional wire...just 2 pairs in, 2 pairs out. The selector does nothing except degrade the signal and add more potential for future problems.

Moral:

1) The first solution installed by some junior flunkie that actually produces sound should not become the future model for a whole chain.
2) If a method of saving money and time is demonstrated, don't fight it... Embrace it. Take it to the bank.

Series/ parallel was a concept taught in the first week of Electronics 101. Hello!...McFly!
Figure it out people. It's not rocket surgery.
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Postby oddioguy » Thu Aug 28, 2008 6:02 am

We're completely redoing the audio in a local high schools auditorium.
Stay tuned, peeps...
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Postby Mathieu Benoit » Thu Sep 04, 2008 3:46 pm

Who's involved in the install?
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Postby Malcolm Boyce » Thu Sep 04, 2008 5:01 pm

oddioguy wrote:We're completely redoing the audio in a local high schools auditorium.
Stay tuned, peeps...
HVHS?
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Postby oddioguy » Fri Sep 05, 2008 6:47 am

Yep.
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Postby oddioguy » Fri Sep 05, 2008 6:48 am

Drumwaiter wrote:Who's involved in the install?

yt....
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