Any commercial intallers here?

Wasn't sure where to post and this IS where the action is so, Before they move this to hardware....

I'm just a semi pro and because this is a small town I get called to trouble shoot sound issues.
The Aquatic Center system has a few issues so they called me to look into it.

#1 - They had a TOA system which an out of town installer came and installed a Peavey MMA 8752 in it's place. Explained later.
They used the TOA modules, I guess they fit, but the question is, are they compatible?
The problem is they are concerned at why they now have to turn all the input channels to 10 and it's still not very loud?
I've tried contacting Peavey and I downloaded the manual which has netted zero info. I have posted on the Peavey forum :(
Any one out there have experience with these systems?
I have a box full of TOA M-01 and U-01 modules I've salvaged over the years. I have to wait for Saturday AM when I can get in there without the public.

#2 - There is a 60 Hz hum that goes away when I disconnect the Cable vision feed. They use it for the background music via a Motorola cable box ( AC not grounded)  . I had looked at this issue a while ago and recommended having the Cable people possibly add a filter or ground their equipment properly. So this resulted in the cable guy trying to ground the cable to the TOA mixer/amp and somehow frying it?? Therefore the removal of the TOA and the Peavey arriving on the scene.
Am I right in thinking there's a filter that can be added to a cable-feed to eliminate hum?
Thanks to all in advance

Thanks Mike, I found the solution to the hum on the Home Theater forums of all places. Its a common problem by the amount of posts.
The stupid thing is why Shaw would not deal with it for a commercial customer. There are line transformers that solve the problem. There is also an issue with the Amplifiers Shaw uses and they never ground them properly. Basically this never shows up until someone hooks up a full on audio system.

Here's a post from the Home Theater forum:


I recently added cable to my home theatre set up. As soon as I plugged the cable feed in audio hum and moving horizontal bars on the screen became part of life.. I called the cable company out they said it was my problem..

After investigating I found that Xantech www.xantech.com have a ground breaker (transformer isolator for coax), part # 634-00. I purchased one plugged it in and it cured the hum and noise bars instantly. It is a tube fitted with F type male and female plugs, and goes in line with your cable input. It looks like the Jensen one I also read about. But it is only $19.00, the Jensen is $50 or so.

I was also told that too large a signal can/might also give rise to noise bars, especially where an amplified splitter upstream of the set up is used. Rather than buying in line attenuators I was told to try using a 1 to 2 splitter in the coax, it will knock the signal down 2 or 3 db. Even try cascading several in series ( each will lower the signal)and if it cures the problem then buy a real 'in line' attenuator with the appropriate rate of attenuation.

It's a 70 volt system. I have been involved a few times but as I am not a certified electrician ( required for 70 volts) and I do not sell equipment anymore I'm just the local trouble shooter. They will bring in the big guns if we don't fix it "Red Green" style first.
My main concern was the compatibility between TOA input modules and the Peavey. I did get an answer at gear sluts forum so all is good. It started a small discussion of Peavey VS TOA. The TOA has been repaired so I could just put it back in. The whole install has been messed up since I last worked on it, I noticed frayed wires and they didn't hook the mute function to the mike input which is much needed.
The Volume issue is either the modules are wrong for the job or someone has messed with the speaker feeds.
70 Volt systems are divided into watts and not ohms. You have to design it so the volume is right in each zone and not exceed the wattage of the power amp. This system has 3 zones. They only use the Canned music feed from the Motorola Cable box via RCA , and a Ipod dock out on the pool deck. There is also a mike to yell at bad kids  that normally mutes all other channels.