Thanks Dejan! But seriously, what do you need to boost or cut a specific frequency band? I don't know much about electronics, but I'm curious about what doodads you need to do such a thing. Like if I want a 6db boost centered at 12KHz with a 2 octave bandwidth what\how many gubbins are involved? Is it way more than the parts in these MIT or Transparent cables?
Well, if you want analog tone controls, then yes, they do use more parts than that cable. That said, I must also point out that if the said tone controls are active, then their effect will generally be smoother than with passive controls, or so I think.
But this is not directly comparable, because with tone controls, classic, equalizer or paramteric equalizer, you have multiple choices which you do not have with the cable. You can boost or cut, and you determine how much when. Next, you can do so at both frequency extremes no problemo, which gives you yet more flexibility than fixed in cable.
In essence, there are only two possible major problems with tone controls, which can mess up the sound. One is that too much action has been provided for too low, so they start to mess with the midrange, which is a no-no kind of a booboo. The other is that they have been poorly designed, with savings in materials and quality, in which case they will mess up the sound for sure.
Believe it or not, the second possibility is the culprit in over 80% of all cases I have ever seen or heard. My most usual cure was to change some component values and reduce their overall action from something wild like +/-15 dB to something more reasonable like +/-3...4 dB, and then I'd change the crappy op amps they get paid to install inside with something decent. And presto, the whole thing changes drastically, plus you get control over your frequency spectrum.
Cheers,
DVV