With the TD-4's standard rack system, the sound source is at the center, so the pad placement prevents cables from It may not reach you, but the length is equal to or longer than the current model TD-17, Even if the sound source is placed on the left side, it can reach the right pad (Actually, I also used it when placing it on the left side so as not to hit the sound source). As with the standard trigger cable, it also comes with a cable for adding Crash 2 (or Ride Bell), Expansion is possible without problems.