The LOC is nothing more than two resistors per channel. One typically about 10k ohm to drop speaker volts down to line level, and another typically about 1k for load. Here is how it works and what it looks like https://www.epanorama.net/circuits/speaker_to_line.html
This circuit can be anywhere. It can be in a LOC box, or you can do like I did and wire it inside the amp. See the pic on my system page. https://systems.audiogon.com/systems/8367 Also if you can find the circuit diagram of any sub with speaker level input you will see the same resistors are the first thing on the board when speaker level inputs are used.
This circuit can be anywhere. It can be in a LOC box, or you can do like I did and wire it inside the amp. See the pic on my system page. https://systems.audiogon.com/systems/8367 Also if you can find the circuit diagram of any sub with speaker level input you will see the same resistors are the first thing on the board when speaker level inputs are used.