Once our RGB cables are released I will update this with more information explaining how they are made, why they are made the way they are, and the details of how to RGB mod each console (probably by using our CleanRGB mods for that console).

The decision was made that all of our RGB mods will be DC-coupled. Why, when most others are AC-coupled?

The answer is pretty simple; AC-coupling was only ever there as a protection for NPN transistors in old equipment in the event the RGB data lines were accidentally shorted to ground, burning out the transistors in the display input stage.

Today, almost all users of RGB cables are installing them into modern capture cards, upscalers or CRT/PVMs with short-circuit protection on the input stage (only really old ones had no protection).

The practise of adding capacitors to the lines is just in my eyes sheep following; "This guy does it, so I will... why? No idea, but he did it so I will"

This article explains it well https://www.analog.com/en/technical-articles/to-accouple-or-not-to-accouple--that-is-the-question33.html.

The disadvantages of AC-coupling are many (cost increase, field tilt, droop, capacitive double-coupling and more), and the advantage is only one... protecting really old CRTs in the event someone shorts the cable to ground.

So, on that note, our RetroSix CleanRGB SCART cable series will entirely unopinionated, they will pass pure RGB and Sync data from the console to the TV. No custom resistors, current shunting to lower levels, or capacitors to remove DC bias. Instead, our CleanRGB mods that go in the consoles themselves will correct all of these flaws, and the CleanRGB CART cable will have the job it should, to simply patch in the retro consoles AV port to the SCART pins.