Pioneer DV-F07 DVD Player "ir amplifier" Questions

...amplifier and a powered subwoofer to the receiver's preout jacks to get full 5.1-channel sound from DVDs, DVD-As, and SACDs. You also get two sets of analog audio inputs and one out, so you can ...

IR sensor to allow control from another unit's remote. If you at one time controlled this unit from an amplifier then disconnected the cable when upgrading the amp, your remote will not work until the