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<blockquote data-quote="thylantyr" data-source="post: 2200158" data-attributes="member: 560358"><p>Line driving article;</p><p></p><p><a href="http://www.rane.com/note126.html" target="_blank">http://www.rane.com/note126.html</a></p><p></p><p>Explains how capacitance effect transmission of frequencies.</p><p></p><p>They are using Belden 8451 (34 pF/ft) as an example.</p><p></p><p>If your source is 600 ohm output impedance and 500 foot</p><p></p><p>cable, you are low passing your audio signal at 15.6 khz.</p><p></p><p>Lets see what happens with a 25 foot cable that has</p><p></p><p>200pf/ft of cable capacitance and a cheap source with</p><p></p><p>a 1000 ohm output impedance and a 10,000 input</p><p></p><p>impedance into your preamp or power amp. Will the high</p><p></p><p>capacitance cable work?</p><p></p><p>Fc = 31khz.</p><p></p><p>yep.</p><p></p><p>Lets do the math using a good piece of audio gear like</p><p></p><p>Parasound to see what happens.</p><p></p><p>The Halo preamp is rated for 60 ohms output impedance.</p><p></p><p>The Halo amp is rated for 47k ohms unbalanced.</p><p></p><p>Lets say I want to run a 200 foot cable that is rated for</p><p></p><p>200 pf/ft, the Fc = 66khz ..</p><p></p><p>**********</p><p></p><p>I bought some RCA plugs to sample and I like this one;</p><p></p><p><a href="http://www.partsexpress.com/pe/showdetl.cfm?&amp;DID=7&amp;Partnumber=091-1265" target="_blank">http://www.partsexpress.com/pe/showdetl.cfm?&amp;DID=7&amp;Partnumber=091-1265</a></p><p></p><p>Using that 8760 [18 awg] audio cable, 0.222" thick, I was</p><p></p><p>able to fit the cable plus some techflex, tight fit but it fit.</p><p></p><p><a href="http://www.partsexpress.com/webpage.cfm?&amp;DID=7&amp;WebPage_ID=161" target="_blank">http://www.partsexpress.com/webpage.cfm?&amp;DID=7&amp;WebPage_ID=161</a></p><p></p><p>The Dayon XLR's are nice too.</p><p></p><p>Male;</p><p></p><p><a href="http://www.partsexpress.com/pe/showdetl.cfm?&amp;DID=7&amp;Partnumber=092-362" target="_blank">http://www.partsexpress.com/pe/showdetl.cfm?&amp;DID=7&amp;Partnumber=092-362</a></p><p></p><p>Female;</p><p></p><p><a href="http://www.partsexpress.com/pe/showdetl.cfm?&amp;DID=7&amp;Partnumber=092-360" target="_blank">http://www.partsexpress.com/pe/showdetl.cfm?&amp;DID=7&amp;Partnumber=092-360</a></p><p></p><p>I like the flex boot on those. Gold plated.</p><p></p><p>You don't need heatshrink if you use the thick cable.</p><p></p><p>For those 100 mil diameter cables you can add some heatshrink if you want to make the joint tight.</p><p></p><p>*********</p><p></p><p>Dual conductor plus drain, how to wire it?</p><p></p><p><strong>RCA to RCA</strong></p><p></p><p>RCA Hot =&gt; one insulated conductor</p><p></p><p>RCA Gnd =&gt; one insulated conductor shorted to the drain</p><p></p><p>Drain wire =&gt; connect to RCA GND</p><p></p><p><strong>RCA to RCA directional {two steps, one for each end of the cable}</strong></p><p></p><p><strong><em>1. RCA source cable end only </em></strong></p><p></p><p>RCA Hot =&gt; one insulated conductor</p><p></p><p>RCA GND =&gt; one insulated conductor</p><p></p><p>Drain wire =&gt; connect to RCA GND</p><p></p><p><strong><em>2. RCA destination cable end only </em></strong></p><p></p><p>RCA Hot =&gt; one insulated conductor</p><p></p><p>RCA Gnd =&gt; one insulated conductor</p><p></p><p>Drain wire =&gt; not connected</p><p></p><p><strong><em>The destination RCA won't have the shield connected</em></strong></p><p></p><p><strong><em>to prevent noise on the shield/drain wire from entering</em></strong></p><p></p><p><strong><em>the destination equipment. </em></strong></p><p></p><p><strong>XLR to XLR </strong></p><p></p><p>XLR Pin 1 = Shield ground =&gt; drain wire</p><p></p><p>XLR Pin 2 = Positive balanced signal =&gt; one insulated conductor</p><p></p><p>XLR Pin 3 = Negative balanced signal = one insulated conductor</p><p></p><p><strong>XLR to XLR directional {two steps, on for each end of the cable}</strong></p><p></p><p><strong>1. XLR source connector [typically female] </strong></p><p></p><p>XLR Pin 1 = Shield ground =&gt; drain wire</p><p></p><p>XLR Pin 2 = Positive balanced signal =&gt; one insulated conductor</p><p></p><p>XLR Pin 3 = Negative balanced signal = one insulated conductor</p><p></p><p><strong>2. XLR destination connector [typically male]</strong></p><p></p><p>XLR Pin 1 = Shield ground =&gt; not connected</p><p></p><p>XLR Pin 2 = Positive balanced signal =&gt; one insulated conductor</p><p></p><p>XLR Pin 3 = Negative balanced signal = one insulated conductor</p><p></p><p><strong><em>The destination XLR won't have pin 1 connected to </em></strong></p><p></p><p><strong><em>prevent noise on the shield/drain wire from entering</em></strong></p><p></p><p><strong><em>the destination equipment. </em></strong></p><p></p><p><strong>RCA Output to XLR Input </strong></p><p></p><p>XLR Pin 1 = Shield ground =&gt; connect to XLR pin 3</p><p></p><p>XLR Pin 2 = Positive balanced signal =&gt; one insulated conductor to RCA hot</p><p></p><p>XLR Pin 3 = Negative balanced signal {now ground} = one center insulated and drain wire to RCA gnd</p><p></p><p><strong>XLR Output to RCA Input </strong></p><p></p><p>XLR Pin 1 = Shield ground =&gt; connect to XLR pin 3</p><p></p><p>XLR Pin 2 = Positive balanced signal =&gt; one insulated conductor to RCA hot</p><p></p><p>XLR Pin 3 = Negative balanced signal {now ground} = one insulated conductor and drain wire to RCA gnd</p><p></p><p><strong>XLR Output to RCA with -6dB output gain</strong></p><p></p><p>XLR Pin 1 = Shield ground =&gt;one insulated conductor and drain wire to RCA gnd</p><p></p><p>XLR Pin 2 = Positive balanced signal =&gt; one insulated conductor to RCA hot</p><p></p><p>XLR Pin 3 = Negative balanced signal {now ground} = <strong>don't connect </strong></p><p></p><p>I made my XLR to RCA connectors with a switch that connects pin 3 to pin 1 to allow selection of output gain.</p><p></p><p>Let me know if there is any errors in this post <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick out tongue :p" loading="lazy" data-shortname=":p" /></p><p></p><p>More configurations here, figure 5.</p><p></p><p><a href="http://www.rane.com/note151.html" target="_blank">http://www.rane.com/note151.html</a></p></blockquote><p></p>
[QUOTE="thylantyr, post: 2200158, member: 560358"] Line driving article; [URL="http://www.rane.com/note126.html"]http://www.rane.com/note126.html[/URL] Explains how capacitance effect transmission of frequencies. They are using Belden 8451 (34 pF/ft) as an example. If your source is 600 ohm output impedance and 500 foot cable, you are low passing your audio signal at 15.6 khz. Lets see what happens with a 25 foot cable that has 200pf/ft of cable capacitance and a cheap source with a 1000 ohm output impedance and a 10,000 input impedance into your preamp or power amp. Will the high capacitance cable work? Fc = 31khz. yep. Lets do the math using a good piece of audio gear like Parasound to see what happens. The Halo preamp is rated for 60 ohms output impedance. The Halo amp is rated for 47k ohms unbalanced. Lets say I want to run a 200 foot cable that is rated for 200 pf/ft, the Fc = 66khz .. ********** I bought some RCA plugs to sample and I like this one; [URL="http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=091-1265"]http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=091-1265[/URL] Using that 8760 [18 awg] audio cable, 0.222" thick, I was able to fit the cable plus some techflex, tight fit but it fit. [URL="http://www.partsexpress.com/webpage.cfm?&DID=7&WebPage_ID=161"]http://www.partsexpress.com/webpage.cfm?&DID=7&WebPage_ID=161[/URL] The Dayon XLR's are nice too. Male; [URL="http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=092-362"]http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=092-362[/URL] Female; [URL="http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=092-360"]http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=092-360[/URL] I like the flex boot on those. Gold plated. You don't need heatshrink if you use the thick cable. For those 100 mil diameter cables you can add some heatshrink if you want to make the joint tight. ********* Dual conductor plus drain, how to wire it? [B]RCA to RCA[/B] RCA Hot => one insulated conductor RCA Gnd => one insulated conductor shorted to the drain Drain wire => connect to RCA GND [B]RCA to RCA directional {two steps, one for each end of the cable}[/B] [B][I]1. RCA source cable end only [/I][/B] RCA Hot => one insulated conductor RCA GND => one insulated conductor Drain wire => connect to RCA GND [B][I]2. RCA destination cable end only [/I][/B] RCA Hot => one insulated conductor RCA Gnd => one insulated conductor Drain wire => not connected [B][I]The destination RCA won't have the shield connected[/I][/B] [B][I]to prevent noise on the shield/drain wire from entering[/I][/B] [B][I]the destination equipment. [/I][/B] [B]XLR to XLR [/B] XLR Pin 1 = Shield ground => drain wire XLR Pin 2 = Positive balanced signal => one insulated conductor XLR Pin 3 = Negative balanced signal = one insulated conductor [B]XLR to XLR directional {two steps, on for each end of the cable}[/B] [B]1. XLR source connector [typically female] [/B] XLR Pin 1 = Shield ground => drain wire XLR Pin 2 = Positive balanced signal => one insulated conductor XLR Pin 3 = Negative balanced signal = one insulated conductor [B]2. XLR destination connector [typically male][/B] XLR Pin 1 = Shield ground => not connected XLR Pin 2 = Positive balanced signal => one insulated conductor XLR Pin 3 = Negative balanced signal = one insulated conductor [B][I]The destination XLR won't have pin 1 connected to [/I][/B] [B][I]prevent noise on the shield/drain wire from entering[/I][/B] [B][I]the destination equipment. [/I][/B] [B]RCA Output to XLR Input [/B] XLR Pin 1 = Shield ground => connect to XLR pin 3 XLR Pin 2 = Positive balanced signal => one insulated conductor to RCA hot XLR Pin 3 = Negative balanced signal {now ground} = one center insulated and drain wire to RCA gnd [B]XLR Output to RCA Input [/B] XLR Pin 1 = Shield ground => connect to XLR pin 3 XLR Pin 2 = Positive balanced signal => one insulated conductor to RCA hot XLR Pin 3 = Negative balanced signal {now ground} = one insulated conductor and drain wire to RCA gnd [B]XLR Output to RCA with -6dB output gain[/B] XLR Pin 1 = Shield ground =>one insulated conductor and drain wire to RCA gnd XLR Pin 2 = Positive balanced signal => one insulated conductor to RCA hot XLR Pin 3 = Negative balanced signal {now ground} = [B]don't connect [/B] I made my XLR to RCA connectors with a switch that connects pin 3 to pin 1 to allow selection of output gain. Let me know if there is any errors in this post :p More configurations here, figure 5. [URL="http://www.rane.com/note151.html"]http://www.rane.com/note151.html[/URL] [/QUOTE]
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