Our school robot team has three AX1500 controllers and two AX2500 controllers and one LDC2550C. The LDC2550C and AX2500 controllers work well with our Spektrum DX7 radio. The AX1500s will not work; the 12V banebot motors are not controllable, they seem to have interference, motors "jitter", etc. We wired them the same. We ran Robotrun to controllers and upgraded the firmware with axfirmware19g-021812.obj file. Any other suggestions?