I recently listened to WBT Nextgen female RCA female plugs on a Tortuga preamp and they gave a lumpy fat bass and lack of tempo - the music seemed slow. These were replaced with some high grade copper rca females and problem fixed. The Cardas rac plugs on another friends Tortuga also sound excellent. I have a balanced Tortuga with factory plugs and sound is also excellent. Not sure if the WBT guys use their ears in designing - it is not pure science, one has to use a few good sets of audiophile ears along the way to get the best sound.
