That cable (Krystal) has used the same construction for 6 years now. One of the most popular cables we offer. If there was a noise epidemic with the design we would have altered it. What do you think twisted pair cable construction should look like? Most are unshielded - do they have noise? Stinger, RF and Lightning would have some major issues then. Its not a coaxial design....which is used in the Klarity, Karma and eKs lines. We took twisted pair and added 3 layers of shielding - we do not state ground braid shield. Along with the Twisted Pair, you have a mylar foil, a copper foil and a tinned copper braid. If EMI or RF noise can pass through 3 layers of metal and then you have some serious interference. Metal is a shield and there are three layers of it in that cable. If you want to talk suit, defamation of character comes to mind seeing as your promoting your "custom RCA's" in your sig and bad mouthing some one you might see as competition.
As for conductor size used, there is good reason for the small gauge, too large and you get high frequency roll off. This is from higher capacitance. The largest gauge you'll see in an RCA is 18 gauge and as small as probably 30. This is not from poor design (well maybe on the 30) but in testing, you can see a roll off of upper ranges (10k+) from too large of a diameter conductor. The signal is a low voltage, low current application, just as a telephone, thus similar sized conductors
back to the OP - Ok so you made your own RCA and grounded the shield yet you still have noise? Does that not tell you that your noise is not related to the cable and that is coming from your head unit? Your own post admits that the cable you made is not keeping noise out (yet you grounded the shield so that makes it great?). That is because the noise is entering from the Head Unit and not the cable. The RCA's are making "feedback" because the level of resistance from the head unit to chassis ground is greater then resistance from the ground of the RCA from the amp to the Head unit (RCA is the least resistive path to ground), when you connect the rca you are completing the loop.
We stand behind our designs and products, if you have a concern please email us.
Accordman - You still never gave us any real information on your terminal size, I then offered a full refund, all you had to do was send those terminals back. You could have then bought any pair you wanted prior to mailing back our model, why you did not understand that then I do not know.....If you want to dig up that thread and read it again, thats fine. We deal with issues logically, not every battery is made to the right spec. We see that often, that is why we wanted your post diameter and the terminal diameter to see where the fault was. Its that cut and dry......any tech support person will want to find out why the problem occured before they can fix it. I hope you can understand that.