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#1
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A golf course PA audio disaster
Started working in a golf course pro shop recently and found a
disaster of a sound system. Every time we wanted to announce a group to tee off the sound system would just cut out. We had to really speak softly into the mic to get it to work. Apparently the staff just got used to this. Yuk ! Not being one to just sit back and accept the status quo I started digging around and found a Mackie Industries AM 4120 P.A. Amplifier. I noticed that when the sound did cut out that the Overload light came on the amp. It was wired up using the 100v output and I found it was going to an 8ohm outdoor radio shack speaker and other various speakers thorughout the club house. I changed the output to a 4ohm output and the overload was gone and the speaker worked ok. I further poked around the basement area and found wires going to speakers that were cut and multiple wiring attempts and other hacks. It appears that the Amp is working fine and I'll have to go back in to discover what other speakers are disconnected/unusable and start replacing them and the wiring. The Amp has 25v, 70v, 100v, and 4ohm output. I'm not an audio pro but I can sure see why this system doesn't work right ! RR |
#2
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"Ron Richardson" wrote in message om... Started working in a golf course pro shop recently and found a disaster of a sound system. Every time we wanted to announce a group to tee off the sound system would just cut out. We had to really speak softly into the mic to get it to work. Apparently the staff just got used to this. Yuk ! Not being one to just sit back and accept the status quo I started digging around and found a Mackie Industries AM 4120 P.A. Amplifier. I noticed that when the sound did cut out that the Overload light came on the amp. It was wired up using the 100v output and I found it was going to an 8ohm outdoor radio shack speaker and other various speakers thorughout the club house. I changed the output to a 4ohm output and the overload was gone and the speaker worked ok. I further poked around the basement area and found wires going to speakers that were cut and multiple wiring attempts and other hacks. It appears that the Amp is working fine and I'll have to go back in to discover what other speakers are disconnected/unusable and start replacing them and the wiring. The Amp has 25v, 70v, 100v, and 4ohm output. I'm not an audio pro but I can sure see why this system doesn't work right ! RR It sounds like someone that didn't know what they were doing hooked up a speaker to a PA system. PA amplifiers for this kind of application often use 25, 75 or 100 volt outputs. These are for (relatively) high-impedance transmission lines for bridging a lot of speakers onto a single amplifier. Each speaker on the line should be connected through a PA transformer to match the speaker impedance to the transmission line. PA transformers typically have 4, 8 and 16-ohm taps on the speaker side, and 25, 75 and 100 volt taps on the other side. Just hook up the correct taps, and you're good to go. The amplifier manual can tell you how many speakers you can safely run on a particular tap. If you just have one or two speakers, you can hook them up to one of the low-impedance outputs (e.g., 4-ohms) without transformers, but it's probably better to use the transformers if you can; it will be easier to add or remove speakers in the future without having to re-configure the whole system. |
#4
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Thanks for the help. Looks like the hardest part to this will be
tracing wires through a musty basement and dusty ceiling... Ron |
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