Channel jumping inputs fender to Matchless [message #27024] |
Sat, 30 April 2005 00:54 |
walters
Messages: 14 Registered: May 2009
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Chancellor |
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1.) What happens when i daisy chain inputs? or channel jump the channels from different amp designs? a.) Does the impedance get mismatched? because the two amps have different circuits and are different designs? b.) Does it change the Frequency Response? c.) Does it load down the inputs? example: guitar goes in fender normal input#1 jack.normal input#2 jack goes to a Orange amp input jack#1 with a daisy chain cord. input jack#2 of orange amp another daisy chain cord goes to a Matchless amp input jack#1 2.) The Signal parallels off to the other amp but is there any REFLECTED load current or voltage when channel jumping? 3.) Does anyone know any cool Channel jumping path ways?
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Re: Channel jumping inputs fender to Matchless [message #27028 is a reply to message #27024] |
Tue, 03 May 2005 11:32 |
Damir
Messages: 1005 Registered: May 2009
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Illuminati (2nd Degree) |
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Two-channel inputs ("normal" and "low") are in 90% cases made of two 68k "input" resistors in series with input grid and one 1-Meg grid leak resistor, see the typical "Fender" schematics. Input 1 ("high", or "normal") has input impedance ~1Meg (ignoring 68k resistors for simplification), and input two ~2*68=138k. When you connect 3 amps in a way you described, you`ll get the total input impedance ~1Meg/3 ~333kOhms. With high-impedance source (guitar PUs) you can count on some high-frequency loss/change of sound (with little help with all those cables, too). But, you can often count on a ground-loop buzz, and hiss,too. Then (non-identical) signal phases through 3 amp together can give you weird effects sometimes. But, often the sound is full and good:-) I tried even some swither/multioutput/impedance converter devices, mixer/line outs, FX loops...but I was never quite satisfied with the results (sound/noise, even oscillations/radio stations, haha) with unequal old amps...but, try it and see.:-)
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Re: Channel jumping inputs fender to Matchless [message #27033 is a reply to message #27031] |
Tue, 03 May 2005 12:21 |
walters
Messages: 14 Registered: May 2009
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Chancellor |
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If i Y Cord 2 amp channels whats the difference in impedance from a Y cord to 2 amp channels and Daisy chaining 2 amp channels the impedances are both different 1.) Y cord impedance going into 2 amps channels? 2.) Daisy Chain inputs going into 2 amp channels impedance? 3.) Im looking at it in a impedance way Y cord VS Daisy Chaining input channels
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Re: Channel jumping inputs fender to Matchless [message #27038 is a reply to message #27037] |
Tue, 03 May 2005 13:30 |
walters
Messages: 14 Registered: May 2009
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Chancellor |
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I thought Y cord was different because its not using the other 68K resistor in the Low input mostly used on amps to daisy chainDaisy chain uses both jacks using both 68K resistors example- guitar goes into 68k input resistor hi input jack The Low input jack 68K input resistor is daisy chained to the other amps channel input so there is another 68K So Daisy chain uses 3 input 68K resistors so the impendances is different because there is 3 68Ks resistors in parallel The Y cord just uses 2 input 68K resistors i don't know if its in parallel i know the signal from the guitar is parallel to the amp channals example: guitar output gets Y cord the Y cord splits to Two different different amps channels one being a marshall and other amp being a fender amp. So there is only 2 68K resistors and not in parallel i think
So the Y cord uses 2 68k resistors
The Daisy chain uses 3 68K resistors in parallel or more if you have more and more amps So the impedances are way diffeerent from using a Y cord than Dasiy chain what do you think im guessing here
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Re: Channel jumping inputs fender to Matchless [message #27039 is a reply to message #27038] |
Wed, 04 May 2005 12:44 |
Damir
Messages: 1005 Registered: May 2009
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Illuminati (2nd Degree) |
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If we count in 68k resistors (and we should), then the situations are like that: a) 2 amps, both input 1 with Rin=1Meg with "Y" cord - guitar "see" the two 1Meg loads in parallel, or 1Meg/2=500k. Three amps - 1Meg/3=333k. b) 2 amps, "daisy chaining" - guitar in input 1 (Rin=1Meg), then out through input 2 to the second amp and its input 1 again (Rin=1Meg). BUT, we now have two 68k resistors in series between inputs 1&2 on the first amp, or in another words, guitar "see" 1Meg in parallel, then 2*68k=136k in series, then 1Meg in parallel. The resultant resistance is now (1000k+136k)//1000k = 531,8 kOhms. Not much of the difference, but if we connect the third amp on the same way (another 2*68k in series, and 1Meg in parallel) then resultant resistance is (531,8+136)//1000k = 400k, larger then "triple" Y-cord result of 333k. But, first amp get full signal voltage, and other two little attenuated signal through 136k/1Meg combinations. Normally, this is correct if the inputs are wired at the same way, you can try it with ohmmeter, amps switched off, cables installed. -All in all, you can try both solutions, but personally I don`t like either of them, as I said, our tiny voltage/high impedance source (guitar PUs) probably needs better solution, see splitter, etc, theory.
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