Tried DeepL on my post for the lulz. The result is factually accurate but defaults to being very formal (being able to switch would require paying for Pro, fair enough).
You refer to diffrent video cables i should try to use instead. At the same time your questioning if my devices are compatible with that sort cabeling. I just want to learn.
The latter part must have been some sort of misunderstanding. It was not a question of
compatibility, but rather interaction of electrical parameters of cable and output.
At audio frequencies, you pretty much only care about 2 or 3 electrical parameters in an (unbalanced) interconnect cable: (*)
* lumped capacitance, i.e. specified cable unit capacitance (in pF/m or pf/ft) times cable length
* shield resistance and shield coverage
* and whether the dielectric is prone to triboelectricity perhaps.
Signal conductor resistance is generally negligible, even when compared just to typical source output impedance.
The sum of cable capacitance and input capacitance forms an R(L)C lowpass with source output impedance.
The best kind of cable for unbalanced interconnects is coax, which comes in a number of standard specifications. It tends to have the lowest unit capacitance, only 67 pF/m for RG-59 (the higher characteristic impedance, the better, but 93 ohm coax like RG-62 is bit exotic, so the common 75 ohm types are a good compromise). (With twisted pair you are likely to see more like 150 pF/m.) Being useful for RF up to hundreds of MHz, it also tends to have good shield coverage and low shield resistance. If you've ever hooked up a satellite dish before, you may have worked with RG-6, but at 8.5 mm OD that's a bit too
thicc for RCA connectors.
Now nominal output impedance for the CX-2 pre-outs is 47 ohms. Input impedance for the MX-2 is 20 kOhms || 220 pF. For our lowpass R = 47 ohms || 20 kOhms (which is approximately 47 ohms), and C = 220 pF + cable capacitance.
So let's assume we have a somewhat lengthy cable with a total capacitance of 600 pF.
That would result in a -3 dB corner frequency of
f3 = 1/(2πRC) ~= 4.1 MHz.
The story for the Gustard R26 with its 100 ohm output impedance is similar, giving ~2 MHz.
As you may be able to tell, neither is even
close to the audible range. (Things would get a bit more
spicy with a tuner, where 3 kOhms is not uncommon. That's just 100 kHz with 500 pF total then. And the real fun starts when your source is majorly inductive, like an MM phono cartridge. You have to pick your preamp and cable wisely if you want a flat response.)
*) Note that additional criteria apply to
microphone cables, like capacitance remaining stable even during movement. I have some here that are utterly useless with phantom power turned on, generating rustling noises of their own - bad cable stock, apparently.
