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I am interested in doing a small experiment using your expertise and my gear. I have an ALO Audio Rx amp (and a Shadow on the way), and I am experiencing hiss from the Rx on the UM3X, source-independent. I noticed that my 74 (?) Ohm adapter removes all of the hiss from this chain but also attenuates low frequencies. What I am hoping is that a lower resistor value would find a happy medium between reducing/removing hiss and keeping low frequencies at acceptable amplitudes. I wonder if there's a sweet spot.

I understand that some custom designs of in-line resistor cables are slightly more complicated than a simple resistor. I do not know if this is true but recall reading this once. It's unclear what the benefits of a more complicated design might be, but it's also been far too long since I've done any kind of electronics, so anyone who can weigh in on that would be appreciated.

Additionally, I've heard it posited that the reason for the low frequency attenuation using the cable has to do with the crossover network that's being employed in the UM3X. I don't know if this is pertinent information but think it could be.

This is as much as an armchair scientific curiosity as it is a functional solution for me. In my head I see this awesome prototype of such a cable that has some kind of potentiometer with known and measurable resistances to fiddle with. Once a value is settled on, we could make a cheap version of the cable to make sure it performs similarly to the experiment, and then we could finally make a higher quality version of the cable.

If anyone's interested in helping with this little experiment, I could definitely use your electronics talents.