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Receiver trips with 18 speaker setup... need equipment advice

post #1 of 7
Thread Starter 
Hi All,

Let me start by saying I am fairly new to the world of audio equipment. I am attempting to replace some equipment in a restaurant and need a little advice. The restaurant was wired years ago in the following manner:

Current setup:
-6 speakers split into one channel (up in the attic somewhere)
-2 speakers on a channel
-2 speakers on a channel
-2 speakers on a channel
-2 speakers on a channel
-4 speakers split into one channel (up in the attic somewhere)
-Sony STR-DH740 Receiver
-6 channel impedance matching speaker selector with volume control (channel A connecting to receiver)
-Grace Digital Audio player (digital optical cable connecting to receiver)

I realize this is probably not a good or ideal setup, save the lecturing! My belief is that the current receiver is being pushed awfully hard and because of such it intermittently switches into "Protector" mode and turns off.

Using the current wiring setup, what is the best manner to make sure the speakers are receiving enough power to hopefully not trip the receiver? Should I look for a larger/more powerful receiver? Do I need some other piece of equipment to help power all of these?

Again, I want to keep this as simple as possible and hopefully receive some advice from professionals here on what receiver/amp I should be using.

Any help is greatly appreciated!!

Best!
post #2 of 7
Thread Starter 
bump
post #3 of 7
Without knowing specifics, it would be hard to fathom a guess. What is the impedance of all the speakers and how are they wired to the speaker selector Series, parallel or a combination of the two? It could be as simple as wiring the speakers in such a way as to get an impedance that is compatible with the receiver. Either that or get an external amp that can handle the load. Speaker switch model would be helpful as well.
post #4 of 7
Thread Starter 
Thanks for the reply! Anything in the aforementioned list that is listed as 2 speakers
uses klipsch 100 watt 8 ohm speakers. Those are all wired directly to the speaker selector, which is a:
http://www.amazon.com/gp/product/B004C6O86A/ref=oh_details_o09_s00_i00?ie=UTF8&psc=1

The 6 speaker split and the 4 speaker split utilize the same type of speakers as above but, for example, for the 6 speaker
split the speakers are all wired to some type of a non-powered splitting box/strip up in the attic. A left and a right
wire come out of this unit and are wired into the selector. The 4 speaker split works in the same manner.

The speaker selector then has an output of a left and right which are wired to the avr (sony str-dh740).



I am attempting to build a list of actual model numbers. So far, I can provide this:
AVR: Sony STR-Dh740
Speaker Selector: http://www.amazon.com/gp/product/B004C6O86A/ref=oh_details_o09_s00_i00?ie=UTF8&psc=1
Speakers: Klipsch speaker (working on getting details)
Speaker Splitter (up in attic): Getting details
Media Player (not important, I imagine): Grace Digital Tuner Pro

I will update as soon as I get the rest of the information.

Thank you all very much!
post #5 of 7
Thread Starter 
My other thought was connecting the media player to a more powerful amp (Pyle 3201 or 3001...I dont know the quality
of these products) and connecting the speaker selector Receiver 'A' to the Pyle. I could then turn on half of
the speakers on the selector to Channel 'A'. Then maybe I connect Receiver 'B' on the speaker selector to the STR-DH740
and turn the other half of the speakers on the selector to Channel 'B'. Then maybe I could connect the pre-out on the
pyle to an input on the STR-DH740...? Is this crazy and/or stupid? This is just a random solution I was hoping may provide
enough power. Thoughts?
post #6 of 7
Get an OHM meter and measure the resistance at the AVR with the wires disconnected from the AVR. An amp may behave the exact same way. Anything below 4 ohms is real bad for the AVR. There are 2 ohm capable amps out there though.

If it is below 2 ohms, bring in on site help.
post #7 of 7
1st of all your choice of equipment is marginal..

To drive so many speakers you need a multichannel amplifier, using that present switcher/volume level component is going to drag the nominal impedance very low. It is recommended that the speakers be wired so that no load is < than 4 Ohms.. My recommendation would be to consider the purchase for a multi-channel amplifier, here is a link to a possible unit..
http://www.ebay.com/itm/Niles-SI-1230-FG00737-Multi-Channel-Amplifier-/150891020037?pt=US_Home_Audio_Amplifiers_Preamps&hash=item2321ce3f05

How good of a system really depends upon your budget, the mentioned present products are low-end and may work today...
But playing reliabily in the future is a big question..
If the $ are tight, you might consider reducing the number of speakers..
This will @ least limit the amplifier load.
Also Craig's list or the local thrift shop may be a source for a quality yet inexpensive name brand amplifier...

Just my $0.05... 👍😉
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