I actually tried it the other day with an pipe organ piece Video I recorded in a church and changing to mono and the bottom speaker is a bit better, the Video is incredible bad when Volume is above 100% in VLC. I also recorded an organ pipe piece with the simple mobile tools soundrecorder and this is way better without changing to Mono and Bottom only, so seems it also to depends on the tool used to record? Using Spotify on max Vol def. needs the change to mono and bottom speaker. Musik from SD card is better without changing to mono and bottom speaker.
after that it was incredible worse and I had to restart the phone 