polmuaddib
Senior Member
- Joined
- Mar 1, 2020
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Hi everybody,
I need help making an XLR input on a regular single end amplifier. Since regular cable adapters wouldn't work, I decided using a transformer and already got the general purpose Lundahl 1588. I saw that they use them in some high end amplifiers.
The reason I need XLR input is for rejecting hum and grund loops that occur in my system. There is no way to track the source of ground loops, so I beg you not to suggest something like that. I also bought the 1588, so I would ask not to suggest other transformers.
Now, here is a schematics of Lundahl and there are three applications that they suggest. There could be others, I suppose, but the one I need is just the conversion of balanced signal to unbalanced without creating a hum or ground loop.
I was thinking of using Parallel-parallel connection (1 : 1) for low loss isolation application, where I would connect pin 6 to XLR hot (2), pin 9 to XLR cold (3) and leave XLR ground (1) floating while on the other side I would connect pin 1 to RCA positive and pin 4 to RCA ground.
Questions:
1. Do I need some resistor, and what value, somewhere? (please, specify where)
2. Since I am hoping for the best SNR connection, would other connection work better, like Phase splitting for 1 : 1+1 input?
3. What about ground from Lundahl (pin 8) and XLR ground (1 and sleeve)? Do I connect all to the chasis of the amp, or only Lundahl ground?
I thank you for all the suggestions. I know this is not a small ask and I really appreciate the help.
I need help making an XLR input on a regular single end amplifier. Since regular cable adapters wouldn't work, I decided using a transformer and already got the general purpose Lundahl 1588. I saw that they use them in some high end amplifiers.
The reason I need XLR input is for rejecting hum and grund loops that occur in my system. There is no way to track the source of ground loops, so I beg you not to suggest something like that. I also bought the 1588, so I would ask not to suggest other transformers.
Now, here is a schematics of Lundahl and there are three applications that they suggest. There could be others, I suppose, but the one I need is just the conversion of balanced signal to unbalanced without creating a hum or ground loop.
I was thinking of using Parallel-parallel connection (1 : 1) for low loss isolation application, where I would connect pin 6 to XLR hot (2), pin 9 to XLR cold (3) and leave XLR ground (1) floating while on the other side I would connect pin 1 to RCA positive and pin 4 to RCA ground.
Questions:
1. Do I need some resistor, and what value, somewhere? (please, specify where)
2. Since I am hoping for the best SNR connection, would other connection work better, like Phase splitting for 1 : 1+1 input?
3. What about ground from Lundahl (pin 8) and XLR ground (1 and sleeve)? Do I connect all to the chasis of the amp, or only Lundahl ground?
I thank you for all the suggestions. I know this is not a small ask and I really appreciate the help.