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Low Earth Orbit
Lighting & Electrical
Electrical Disto Evaluation and Upgrade Options
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<blockquote data-quote="Art Welter" data-source="post: 82994" data-attributes="member: 52"><p>Re: Electrical Disto Evaluation and Upgrade Options</p><p></p><p></p><p>The OP said he used Crest 9200 on subs driven Stereo at 2 ohms.</p><p></p><p>A single Crest 9200 loaded at 2 ohm stereo draws well over 60 amps peak.</p><p></p><p>Ignoring all the other 2 ohm load PA amps and 8) XTi4000 on monitors and LED lights, the 75 feet of 6/4 would drop 7.2 volts (at only 60 amps) and the 50 feet of 10/4 another 4.3 volts, leaving only 108.5 volts even if the generator held a stiff 120 volts.</p><p></p><p>Considering all the other loads, it is likely that voltage at the amp racks would have dropped below 105 on peaks, and the amp's output would be some 6 dB (or worse) less than if big cable was used.</p><p></p><p>Chris could have determined voltage drop by measuring at the genset and at the amp rack, but to me it looks like the undersized (for voltage drop) cable is the culprit.</p></blockquote><p></p>
[QUOTE="Art Welter, post: 82994, member: 52"] Re: Electrical Disto Evaluation and Upgrade Options The OP said he used Crest 9200 on subs driven Stereo at 2 ohms. A single Crest 9200 loaded at 2 ohm stereo draws well over 60 amps peak. Ignoring all the other 2 ohm load PA amps and 8) XTi4000 on monitors and LED lights, the 75 feet of 6/4 would drop 7.2 volts (at only 60 amps) and the 50 feet of 10/4 another 4.3 volts, leaving only 108.5 volts even if the generator held a stiff 120 volts. Considering all the other loads, it is likely that voltage at the amp racks would have dropped below 105 on peaks, and the amp's output would be some 6 dB (or worse) less than if big cable was used. Chris could have determined voltage drop by measuring at the genset and at the amp rack, but to me it looks like the undersized (for voltage drop) cable is the culprit. [/QUOTE]
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