Quantum Aristo RS3 Installation
These locomotives were supplied with several different speakers with different heights. As such there may be interference between the top of the speaker magnet and the Quantum Aristo decoder when the decoder is plugged into the locomotive’s connector board. If this is the case you can simply move the Aristocraft connector board towards the cab to provide enough vertical clearance. You can use double-sided tape to secure the moved connector board.
The photo below shows the connector board in its original location:

The photo below shows the connector board moved aft to clear the speaker.

