The most likely cause of this issue is because you are using a mono to mono pin cable, and often times to transition into third party units you need a mono to stereo pin cable. Channel Vision sells these types of cables, they are called IR Bypass Cables, model # IR-4180. Please click on the following link to view the product. This has 3.5mm pin to 3.5mm pin. If the mini pin IR input ports require a different size you may need to do some web research to find the correct cable type.