Retrofitting ceiling speakers into a conference room - AVS Forum
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Old 09-12-2013, 02:09 PM - Thread Starter
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Greetings!

One of my clients has a really nice conference room, but they never thought about having sound wired into it until now. There is a VGA cable going from the cabinet up to the ceiling mounted projector, and luckily it has a stereo audio (headphone cable) integrated into it. So I have a way to get a simple signal up there. He wants 4 speakers mounted in the ceiling, and this will be connected to a computer in the cabinet that does powerpoint and video presentations and such.

I had thought about putting a small DTA-100a t-amp in the cabinet and then piping its signal up thru that headphone style cable, and then splitting it out to feed the 4 speakers. Thats a total kluge, but I dont know another way to get signal up to them.
Can a headphone cable handle 25-30 watts per channel? And that plan requires wiring the speakers in series so that the little amp gets a 16 ohm load. (stock its rated for 50wpc @ 8ohms)

There is electrical power in the ceiling (right beside the projector), and I could theoretically put the amplifier up there and connect the speakers directly, but then how would the users turn the amp on and off?

None of the parts have been bought for this, but the budget looks like 500-600$ for all the parts.

Suggestions? What am I missing?
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Old 09-12-2013, 03:39 PM
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Here is one option: These are very small and two can be powered by one power supply. The computer audio control screen can be accessed for volume/tone control I doubt seriously that the conference room will need more than 7-10 watts for playback of a PP presentation. Depending on the audio quality your client is looking for, you can expect to range from about 35.00ea. for BOTL speakers all the way to about 200.00 ea The budget of 5-600.00 will be cut substantially simply for the speakers before you even get to the amp.

http://www.rdlnet.com/product.php?page=486
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Old 09-12-2013, 03:53 PM - Thread Starter
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Quote:
Originally Posted by Gizmologist View Post

Here is one option: These are very small and two can be powered by one power supply. The computer audio control screen can be accessed for volume/tone control I doubt seriously that the conference room will need more than 7-10 watts for playback of a PP presentation. Depending on the audio quality your client is looking for, you can expect to range from about 35.00ea. for BOTL speakers all the way to about 200.00 ea The budget of 5-600.00 will be cut substantially simply for the speakers before you even get to the amp.

http://www.rdlnet.com/product.php?page=486

interesting, can that little amp simply be left on all the time?
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Old 09-12-2013, 06:08 PM
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No reason why not. Hundreds of thousands of amps are never shut off. Is the computer ever powered down? If so, you could use a USB voltage controlled relay to control the power to the amp.
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