True stereo passive amplifier for iPhone 16 Pro

This is the first truly stereo passive amplifier (as far as I could see at least) for the iPhone 16 Pro (in a slim case). The left speaker projects the focussed sound of the bottom iPhone speaker, whereas the right speaker does the same for the iPhone's top speaker (just under the phone's bevel), resulting in a well balanced stereo sound that is boosted between 5 and 9 dB depending on the frequency characteristics of the sound being played (music, movies, recorded interviews, etc.). The amplifier is dimensioned to fit the iPhone 16 Pro in its slim case snugly (allowing for optimal sound transition into the amplifier's sound channels), and is tilted at slight angle to have the sound directed at the listener when placed on a table. 

Place the iPhone with the camera's in the bottom right facing backwards (the indent in the back fits the cameras and the indent in the bottom prevents the action-button from be pressed accidentally when placing the camera or adjusting the volume using the volume buttons.

For those preferring a more portable version, there's also a profile with the amplifier split into 3 smaller parts that easily fit in a jacket pocket and slight together (first time a bit of force might be required, after that this will go smoothly.

Print with at least 3 walls and 35% infill to optimize internal reflections and minimize volume loss through unwanted vibrations. For best sound performance print with 6 walls and 100% infill (will almost double the weight though).

For other iPhones just use the slicer to cut the speakers off and adjust the length of the middle part before reassembling. Note: the stereo-feature will NOT work on phones that have both of the stereo speakers in the bottom.