Steve Hillage. |
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BJtheDJ
Young Croc Joined: 28 November 2012 Location: Bristol Status: Offline Points: 886 |
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Please
accept my apologies, the first paragraph actually referrred to another
thread and was completely out of place in this thread. However
the rest of the post is still valid, take the headphone output from
your iPad and use a splitter as illustrated by Conanski in https://forum.speakerplans.com/forum_posts.asp?TID=105701&PID=1046793&title=steve-hillage#1046793 to feed the signal into the jack sockets (if any) on your amp.
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It's a difficult choice, would you rather have:
A: A vegan son. B: An OnlyFans daughter |
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Conanski
Old Croc Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2543 |
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Go lookup how a balanced circuits work and then tell me how I'm wrong. Edited by Conanski - 15 September 2020 at 1:26am |
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BJtheDJ
Young Croc Joined: 28 November 2012 Location: Bristol Status: Offline Points: 886 |
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OK. I don't have to look it up. You're wrong. What you illustrate above is a balanced circuit (balanced circuits are always mono), and completely different to the circuit in question. The OP has a stereo signal composed of two channels of unbalanced audio. A balanced signal and a stereo signal are two completely different things, although you can have stereo balanced signals they'd need at least 5 connections (a pair of balanced connections for each channel and a common ground connection) to work properly - not the three that are in question here. A balanced signal is a mono signal that has two components in anti-phase which are summed with each other, because of that any noise picked up is identical in both sides of the circuit and then cancels itself in the summing amplifier or the transformer (whichever is in use) of the input. An unbalanced signal has a signal wire and a ground wire as illustrated by you in the picture that you posted in https://forum.speakerplans.com/forum_posts.asp?TID=105701&PID=1046793&title=steve-hillage#1046793 where it can be clearly seen that that the two jacks are not not balanced. Even if both of those were inserted into the same channel of an amplifier then they would still be in phase and would not cancel but would instead be summed.
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It's a difficult choice, would you rather have:
A: A vegan son. B: An OnlyFans daughter |
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Conanski
Old Croc Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2543 |
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You need to go try this for yourself.
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fatfreddiescat
Young Croc Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1083 |
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What you are referring to is a differential output.
Edited by fatfreddiescat - 15 September 2020 at 4:02pm |
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BJtheDJ
Young Croc Joined: 28 November 2012 Location: Bristol Status: Offline Points: 886 |
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So, ignore everything else and pick out one small thing ??? Nice snipping, not. Back in the day way back to the 60s I did, again in the 70s and the 80s and it's been the same every time; my stuff since then (apart from plugging customers' 'phones and iPods into the mixer) has been balanced line. I speak from experience.
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It's a difficult choice, would you rather have:
A: A vegan son. B: An OnlyFans daughter |
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BJtheDJ
Young Croc Joined: 28 November 2012 Location: Bristol Status: Offline Points: 886 |
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This adapter is most likely the cause of your problem. FatFreddiesCat has posted a possible solution. The easiest solution would be to take the to positive leads and solder the together to pin 2 of the XLR, then take the one of the ground leads and solder that to pins 1 and 3. Solderer's choice what to do with the other ground lead since bothe will be connected together at the iPad end of the cable - either snip or solder both together, which would give the possibility of a ground loop causing hum.
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It's a difficult choice, would you rather have:
A: A vegan son. B: An OnlyFans daughter |
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fatfreddiescat
Young Croc Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1083 |
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As still a little unclear with regards the OP's cabling, the cable Conanski has posted is correct for an amp with jack inputs whether or not the inputs are differential and balanced or not. If using xlr in then signal should appear on pin2 or pin3 ( pin2 is more common)of the xlr only, other pin linked to pin1 on xlr. One xlr for left and another for right channels not left and right connected to a single xlr.
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alglw
Registered User Joined: 13 April 2011 Location: glasgow Status: Offline Points: 10 |
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This is a very common problem as the 3.5mm jack stereo ( left,right,and ground.) Gets wired to a single xlr by some adaptors ( or ‘bright spark without a clue’ ) wired as left to +,right to-,and ground to ground.
The balanced input does its job and subtracts - from + and all that’s remains of the music is reverb and little or no bass and no lead vocals. The information being given is to help sort the problem. I gave up replying a long time ago as it seems the people asking questions didn’t like being told they were wrong. |
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bin juice24
Registered User Joined: 07 February 2020 Location: Here Status: Offline Points: 209 |
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Thanks for your input. I’ve just received a stereo y cable and will try that later. I really don’t mind being told I’m wrong. Surely that’s the whole point of asking why something isn’t working?
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fatfreddiescat
Young Croc Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1083 |
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Just to add re stereo jack to two XLR's cable or any unbalanced to balanced input, an improvement in CMMR may be had by using two core plus screen cable and shorting pin1 to pin3 at the source end of the cable instead of at the XLR end, this is because any noise induced on the signal line connected to pin2 on the XLR (or stereo jack etc) may to a degree be present on the line to pin3.
Not much fun trying to make one of these up with a 3.5mm jack plug though. Using the circuit as pictured in one of my previous posts it is possible to make a balanced line adaptor for your phone / ipad/ laptop etc with 2 resistors and a capacitor. This is due to the fact that a balanced line connection is two impedance matched lines, only one of which needs to carry your signal, by being impedance matched any interference appearing on one line will appear on the other, in phase and in equal level, the receiving end will then invert one and add the two together therefore cancelling the interference (never 100%). You will need measure the output impedance of your unbalance device to do this and the more accurate you are the better the CMMR performance will be. Headphone outputs should be well suited to this as have a low source impedance, ideal as a cheap method for long runs in fixed installs. |
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MarcoAudio
Registered User Joined: 22 July 2017 Location: U.K Status: Offline Points: 35 |
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I don't know if I understand the original posters needs correctly but I plug external sources like phones etc into the microphone line into mixer using a 3.5 adapter with a long lead round the then can adjust volume, bass and treble with the mixer's microphone controls. Get good results that way.
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