Office audio amp replacement - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 6 Old 02-06-2017, 01:00 PM - Thread Starter
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Office audio amp replacement

Hello all. My office (work) is about 4500 sqft with 10 speakers. We had a, now defunct, low voltage company setup our whole office audio about 2.5 years ago. All 10 speakers were feed by 2 4-wire speaker cables into a Yamaha AV receiver. The Yamaha receiver is broken and needs replacement but to me a large receiver is overkill. I have no need for any AV switching or multiple inputs. The office is all 1 zone and we exclusively use Spotify off an iPod Touch.

Could we just use a smaller stereo amp? How about the Sonos Connect Amp?
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post #2 of 6 Old 02-06-2017, 02:06 PM
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Speakers - what do you have and how are they wired?

SONOS - you would use a CONNECT + a suitable power Amp.

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post #3 of 6 Old 02-06-2017, 02:09 PM - Thread Starter
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Originally Posted by Joe Fernand View Post
Speakers - what do you have and how are they wired?

SONOS - you would use a CONNECT + a suitable power Amp.

Joe


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That's the problem. I'm not sure what I have up there because the company that installed them isn't around anymore. I'm not sure if they are in series or parallel. There are 2 cables coming from the ceiling, each containing 4 wires: red, white, black and green. All the wires were twisted together by their respective colors and hooked up as follows: Red to left positive, White to right positive, black to left neg, and green to right neg. Any insight on how the office was wired based on this info?

I was thinking that if the Sonos connect amp is powerful enough then that would be all I'd need and simplify things. If not then, yes your suggestion makes total sense.

Thanks for your reply.

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post #4 of 6 Old 02-06-2017, 02:17 PM
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SONOS CONNECT:AMP - Not about power so much as the total load (impedance) of 10 speakers.

Wired correctly the CONNECT:AMP will drive two pairs - anything more and you need additional kit.

Speakers - ideally drop one out of the ceiling and see what you have.

Wiring - a pic of the the wiring at the AVR will be handy.

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post #5 of 6 Old 02-06-2017, 02:59 PM - Thread Starter
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Originally Posted by Joe Fernand View Post
SONOS CONNECT:AMP - Not about power so much as the total load (impedance) of 10 speakers.

Wired correctly the CONNECT:AMP will drive two pairs - anything more and you need additional kit.

Speakers - ideally drop one out of the ceiling and see what you have.

Wiring - a pic of the the wiring at the AVR will be handy.

Joe


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Thanks Joe! I really do appreciate your time.

Message received about the connect amp. So basically I guess I'm looking for a amp to drive the speakers.

Here are some pics. The first is the 2 wires coming down from the ceiling. You can see that they are twisted together. The other is how they are hooked up to the receiver. Just did another count, there are 12 speakers and 5 analog volume dials.

Good idea about dropping a speaker down. I'll have to wait until I get a ladder (15' ceilings) so I can't look at that now.
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post #6 of 6 Old 02-08-2017, 11:27 AM
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If it were me, I would turn it into a 70 volt system. Each speaker would have a transformer and all speakers would be wired in parallel. Tap the speakers at 5 watts, and feed them with a 100 watt amp.

Some of the beauties of a 70 volt system are: You don't have to sit with pencil to paper to figure out how to connect everything together in order to maintain the proper impedance -- all speakers are in parallel; Assuming all speakers are tapped the same, the speaker that's 300' away has the same loudness as the speaker that's 30' away; Because you can tap the speakers differently, you can have certain speakers louder or quieter than the rest. The speaker in an office or conference room doesn't need to be as loud as the one in a large storage area; You can easily add speakers as needed, as long as you don't exceed ~80% of the amplifiers rated output.

CIAO!

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