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Audio Troubleshooting at Church
Jul. 27th, 2010 07:02 pmSince starting on the sound team, one of the things I've become aware of is an intermittent problem (Ack! Intermittent problems suck!) with the sound coming from the stage-left monitors. Sometimes it is just a crackling sound and sometimes the audio will just drop out. The other sound tech learned that usually just unplugging the speaker cable from the back of the amp, touching it on some metal, and plugging it back in will fix things up.
I'm just too anal to keep guessing, so I started marking the monitors to ensure that it wasn't a faulty monitor continuously being placed on that side causing problems. To track down the problem further, I would need to follow the cable back to inside a large speaker cabinet that holds the stage-right speakers. Under the speakers are two amps with a whole nest of cables.
Today, I took a couple of hours, went to Aldersgate UMC, and did some exploring. First, I crawled into the bottom portion of the speaker cabinet with a flashlight and inspected the rear panels of the amps. I used an orange tie which I wrapped around my targeted cable and tracked where everything was coming from and going to (my first attempt trying to follow cables with just my eyes resulted in my mistakenly thinking the monitor amp was supplying a feed to the stage-right speakers). I then sketched the back of the amp panels and wrote in what was plugged in where and where those connected cables went. Before leaving back there, I pulled out a bunch more cable ties and did my best to gather together the excess cables so it was much more organized behind the amps. A can of air will be going with me on my next visit to clear out some of the dust.
I didn't notice anything with the amps that made me think there was a configuration problem there, so my top theory right now is that there is a short or something wrong with the Mon2 cable that runs from the amp to the stage-left monitors. But there is a slight complication. The mon speaker cables are 1/4" jacks on the monitor end and are spliced open and connected to banana clips on the amp end. I hate splicing cables and was concerned that I would have to not only find a spare speaker cable...but then splice one end for the banana clip connection. Thankfully, after getting home and finding the manual for the amp online, I verified that the 1/4" above where they are connected now will also work. Now I am only in search for a spare speaker cable that can reach from this cabinet to just past center stage.
As part of my continuing education of the sound system in the Fellowship Hall, I also peeked under the stage at what all was connected under there. Something that stood out to me is that there is unused audio equipment underneath - as in, when the old sound system died, it looks like they just unplugged it but left all the cables and equipment in place rather than remove it. This is most easily illustrated by a large cluster of cables that stick out of the wall/ceiling in the back of the Fellowship Hall. This collection of XLR and other cables just dangle above the door to the library. It is a backburner project, but once I run out of other things to do, I might put in the time and effort to examine the old audio equipment and see what all I can still use and what can be removed for good. But before I undertake that big task, I really want to find the older members of the church to track down anyone that may have any insight to the audio equipment history of the Fellowship Hall and someone's approval for me to actually do this.
But first...gotta swap cables for the amp-to-mon connection and see if that solves the problem.
I'm just too anal to keep guessing, so I started marking the monitors to ensure that it wasn't a faulty monitor continuously being placed on that side causing problems. To track down the problem further, I would need to follow the cable back to inside a large speaker cabinet that holds the stage-right speakers. Under the speakers are two amps with a whole nest of cables.
Today, I took a couple of hours, went to Aldersgate UMC, and did some exploring. First, I crawled into the bottom portion of the speaker cabinet with a flashlight and inspected the rear panels of the amps. I used an orange tie which I wrapped around my targeted cable and tracked where everything was coming from and going to (my first attempt trying to follow cables with just my eyes resulted in my mistakenly thinking the monitor amp was supplying a feed to the stage-right speakers). I then sketched the back of the amp panels and wrote in what was plugged in where and where those connected cables went. Before leaving back there, I pulled out a bunch more cable ties and did my best to gather together the excess cables so it was much more organized behind the amps. A can of air will be going with me on my next visit to clear out some of the dust.
I didn't notice anything with the amps that made me think there was a configuration problem there, so my top theory right now is that there is a short or something wrong with the Mon2 cable that runs from the amp to the stage-left monitors. But there is a slight complication. The mon speaker cables are 1/4" jacks on the monitor end and are spliced open and connected to banana clips on the amp end. I hate splicing cables and was concerned that I would have to not only find a spare speaker cable...but then splice one end for the banana clip connection. Thankfully, after getting home and finding the manual for the amp online, I verified that the 1/4" above where they are connected now will also work. Now I am only in search for a spare speaker cable that can reach from this cabinet to just past center stage.
As part of my continuing education of the sound system in the Fellowship Hall, I also peeked under the stage at what all was connected under there. Something that stood out to me is that there is unused audio equipment underneath - as in, when the old sound system died, it looks like they just unplugged it but left all the cables and equipment in place rather than remove it. This is most easily illustrated by a large cluster of cables that stick out of the wall/ceiling in the back of the Fellowship Hall. This collection of XLR and other cables just dangle above the door to the library. It is a backburner project, but once I run out of other things to do, I might put in the time and effort to examine the old audio equipment and see what all I can still use and what can be removed for good. But before I undertake that big task, I really want to find the older members of the church to track down anyone that may have any insight to the audio equipment history of the Fellowship Hall and someone's approval for me to actually do this.
But first...gotta swap cables for the amp-to-mon connection and see if that solves the problem.
