We have eight speakers in eight room with their individual volume control. we want to run one source from the yamaha recievers to all these eight speakers in stereo sound. pls tell us how we can wire eight speakers to the yamaha reciever (RX v1800) so that all the sound frequencies are heard on eight speakers in stereo sound.

A capacitor is more like to fail than a coil, so I would also suspect a cap first. Capacitors conduct high frequency more than low frequency, so this may explain the extra load and shutdown on high frequencies.

The REC OUT jacks on the back are usually the best as they are not affected by the system volume. You'll need an RCA L and R Male to Headphone (1/4" female) adapter (available at Radio Shack and online sellers).

How loud? Just noticeable if you focus or could it be buried by music? I've heard of and had noise from other electical devices in room like a light dimmer. Try headphones. Make sure your signal and speaker wires aren't running near power cords or sources of high current or magnetic fields like TV's and other speakers.

Why don't we deal with the issues separately?

What are you trying to accomplish with speakers all around the house. Or did you mean around the ROOM?

You can't slave other amps off of this unit and have volume or source control at the receiver. It lacks any Preamp Outputs.

Tell us what you want to do, how things are connected (in detail) right now and maybe we can help you out.

It might also be helpful to know WHY you need to have multiple amps.

you can check them with a ohm meter, hook it to the wires that you hook to the reciever and if you get a reading it is good if no reading it is bad wires

The infrared mentioned by the manual is most likely an extension possibility to use the remote control in each room, forget that part.
What you need to do is quite simpel, after connecting all speakers, you should indicate in the setup menu of each zone which speakers are connected and do as follows:
in main room select 5.1 setup, for the other zone select only the left and right front speakers.
Your EXTRA SP indicates the extra speakers for 7.1 setup and when set to zone B it recognises only 1 speaker.

So read carefully the manual how to connect Zone 2 speakers and connect that way, than carefully walk through the setup menu to setup the zone 2 correctly.

Hi...
Without a huge mess, I would suggest one of the multi-speaker selectors that partsexpress.com sells or a similar item.
Just put "speaker slector" in their search engine.

If youre going to 8 other rooms..you might try a couple of wireless speaker systems too. They work in stereo and ....no wires

This should put you on the right track...

https://www.hifiengine.com/hfe_downloads/index.php?yamaha/yamaha_rx-v1600.pdf

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Good luck!

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the mani surround room should be connected to the front speakers A, Center, sub pre-out and surround.
for the other two rooms connect them to surround/back, go into settings and in power amp assignment assign the surround back speakers to the multi room.
once this is complete with your remote in the zone2 control mode you can play your sources in zone2 and control the volume also, if you have inwall volume controls set the zone2 volume to -10 and use the room controls.
To listen to the same source in both zones you will have to select that source in both zones

Most amps will only power two sets of speakers direcrly hooked to amp (A&B). If you want audio throughout the house, I would recommend a PA system set up with individual room volume controls