2. analog
  3. 173274-124530

How important is the cable between the SUT and phono pre?

I know when using a cable between a MM cartridge and the phono pre it's very important to take into account the capacitance of the cable for cartridge loading.

I don't recall seeing a discussion on the importance of using low capacitance cables between a SUT and  phono pre.  

I picked up a Denon Au-340 to replace my Denon AU-320 in my system and the AU-320 has built in cables that run to the phono pre, hence my question.

Is there a way to figure out the capacitance requirement for this cable or is it not that important? Will a good shielded cable work fine?

I don't want suggestions on some high dollar cables, that will never happen. I have about 15 or 20 pairs of cables that I picked up over the years, I can always go through the pile and measure the capacitance if necessary.

Thanks

 

BillWojo

billwojo
jpjones3318's avatar
jpjones3318
149 posts
 

Thank you for the reference.  Section 1.2.4 is in regard to inter- and intra-winding capacitance and electro-static shielding, which I understand.  While Figure 16 depicts secondary load C as CL, I do not see a reference to it in the text.  This section doesn’t seem to address reflected C.  

imhififan's avatar
imhififan
2,225 posts
 

@jpjones3318 

I think Chapter 1.3.2 or page 11 is what you looking for?

dover
2,308 posts
 

My laymans understanding of the scenario is that because the MC transformer converts high current low voltage LOMC to a higher voltage low current signal exiting the transformer an interconnect with high capacitance between the transformer and MM phono is more prone to noise intrusion.

intactaudio
307 posts
 

Would love to see a cite with a detailed technical explanation.

You are looking too deep into it.  This is the simplest basic transformer theory and the simple ideal transformer model is all that is required.  The problem you are having is assuming the load is a resistance but in reality it is an impedance which can be any combination of R, L or C.  By the time you get into the models that include external capacitive loads, the concern is more about how that capacitance interacts with the internal R,L and C of the transformer and not how it reflect back to the source.

dave

jpjones3318's avatar
jpjones3318
149 posts
 

No, that's not the problem I was having.  Worked through it with a friend and see that I was not correct.  Regardless, something that actually explains it would be beneficial.  I like to enhance my understanding of things, not just parrot what someone says because they said it. 

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