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I Guess I'll Start This Off
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<blockquote data-quote="Mike Caldwell" data-source="post: 31165" data-attributes="member: 170"><p>Re: I Guess I'll Start This Off</p><p></p><p>I was recently at a school to take care of sound system issues their gym system has had for some time (ever since it was installed I would say!!!)</p><p>What I found was:</p><p>In the rack was a small Shure mixer for use during games and simple audio needs. They also have an input to the system</p><p>from another 24 channel mixer used during stage productions. The installer had set up a relay to select what mixer would feed the system. Here where it gets crazy......the installer took the negative (-) outputs from the two mixers and the (-) input to the system and tied them all together and only used the relay to switch the positive (+) side of the balanced connections. All inputs and outputs were fully balanced. I'm guessing the installer did not understand the difference between ground and (-) in a balanced connection.</p><p></p><p>There was a small 15 inch sub/low cabinet in the system driven from it's own amp channel with no form of crossover what so ever anywhere from the input to the amp all to the speaker cabinet, yes that single 15 was just barking out full range audio.</p><p></p><p>Two mic inputs were really noisy, found out they were split between the rack mount mixer and the 24 channel stage production mixer......using RDL line level amps with the gain cranked wide open on each one.</p><p></p><p>I got the system working better for their graduation, going back this summer to install a DSP with presets for different system uses.</p></blockquote><p></p>
[QUOTE="Mike Caldwell, post: 31165, member: 170"] Re: I Guess I'll Start This Off I was recently at a school to take care of sound system issues their gym system has had for some time (ever since it was installed I would say!!!) What I found was: In the rack was a small Shure mixer for use during games and simple audio needs. They also have an input to the system from another 24 channel mixer used during stage productions. The installer had set up a relay to select what mixer would feed the system. Here where it gets crazy......the installer took the negative (-) outputs from the two mixers and the (-) input to the system and tied them all together and only used the relay to switch the positive (+) side of the balanced connections. All inputs and outputs were fully balanced. I'm guessing the installer did not understand the difference between ground and (-) in a balanced connection. There was a small 15 inch sub/low cabinet in the system driven from it's own amp channel with no form of crossover what so ever anywhere from the input to the amp all to the speaker cabinet, yes that single 15 was just barking out full range audio. Two mic inputs were really noisy, found out they were split between the rack mount mixer and the 24 channel stage production mixer......using RDL line level amps with the gain cranked wide open on each one. I got the system working better for their graduation, going back this summer to install a DSP with presets for different system uses. [/QUOTE]
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