It's mostly about time-amignment, not low-pass. High frequency information travels electrically through the cable at a different speed than low-frequencies. Therefore, depending on the length of cable needed, each MIT cable is calibrated to re-align the audio signal electrically before it exits the cable. Typically, the result does improve bass because less low-frequency information is lost to cancellation due to mis-alignment. Now MIT has refined this philosophy to what they call poles of articulation, which finds the "sweet-spot" electrically for many frequency points. The higher the price of MIT cables the more poles of articulation.
MIT cables and super tweeters
So I'm leaning towards purchasing some MIT cables (likely Shotgun S3 IC and speaker cables), but I can't figure out what the network box on the cables actually does. From what I've read, it appears to act as a low pass filter to remove all the grunge carried at utlra high frequencies which supposedly can muck up the audible frequencies. While this doesn't sound like a bad thing, I also intend to purchase a Townshend Super Tweeter (20kHz -70kHz per specs) some time this year (**crosses fingers**). If the MIT's network box is acting as a low pass filter, then wouldn't it filter out all the audio frequency info that would've gone to the super tweeter? Anybody have any insight on this as I'm not sure if this is even right. Thanks much.