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In Reply to: RE: preamp with paralled outputs degrading audio posted by Eli Duttman on September 16, 2014 at 18:56:32
heres a picture of the behringer
I just remebered that I am using an rca to xlr adapter into the behringer inputs
maybe thats part of the cause?
Edits: 09/16/14 09/16/14Follow Ups:
"I am using an rca to xlr adapter into the behringer inputs"
Do you have specs for the in/out impedance of the adapter?
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Buy Chinese. Bury freedom.
You're thinking of the good transformer based adapters. But most sold are nothing more than wire jumpers.
There are many discussions on this subject of cheap unbalanced to balanced conversion, and legitimate different approaches for input versus output as well as transformer based versus OPAMP input and output stages.
I suggest people do their own research on this 50 year old plus subject. Way too much to post here.
its just a plug that has one signal and 2 ground pins like bottom picture
That's opamp based circuitry. It's quite possible that the I/P impedance is different when the unit is powered on and when it's powered off.
More than 1 SS recording device has required buffering, when used in combination with tubed phono sections. Remember, BJTs are inherently low impedance devices. BJT circuits elevate the I/P impedance by the application of NFB. Take the power away and you have the low impedance of the base/emitter junction.
Constructing a JFET buffer is not difficult. Assemble a regulated bipolar PSU from a "Rat Shack" 25.2 VCT trafo, 4X Schottky diodes, and 7812/7912 3 terminal regulator ICs. The only cap. in the signal path is between the FET's source electrode and the load. The minimum coupling capacitance is 3.3 μF. That will work (barely) into the IHF "standard" load of 10 K.
Eli D.
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