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[Keith Broughton]

yep, I  was hoping not to need to do this as the place is a rabbit warren. I had hoped that as the system has been in place a for a number of years that that the main install would be OK and that the issues they were having were people fiddling with the front end. Oh well....

will be in there early doors on Sunday morning to go over it in more detail.

Don't forget a dust mask when you go digging in the ceiling.
Good luck!

[Steve M Smith]

It might be easier to cut it all off and start again.  Use the old cable to pull through a new cable - Unless someone has cable tied it to everything!


Steve.

[John Roberts {JR}]

I repeat my original advice (divide and conquer) + ask if anyone remembers an event or change when the system first started working bad? 

JR

[Jerome Malsack]

Turn all amps off and then turn only one on and see what the result is.

[claude cascioli]

Decades ago, "dB" magazine had an article on how to troubleshoot a 70V system. I wonder if anyone still has a copy?  But as I recall the number one problem is that someone hooked up a speaker without using a matching transformer.

Adding a passive sub would require a real big matching transformer and place a great burden on the amplifier.
call a sound contractor you have no businuess doing this job

[Jerome Malsack]

One tool is an impedance meter. 

http://www.toaelectronics.com/products/zm-104a.html

Worth looking at the manual on the attached pdf on the web link. 

[ProSoundWeb Community]