Re-read what I wrote:
If you are using HDMI Audio, then the Speaker Configuration settings in the OPPO, including Speaker Large/Small choices and the Crossover Frequency setting itself, HAVE NO EFFECT. The default, 80Hz Crossover setting in the 103 does not apply to HDMI Audio output.
Make all of your Crossover choices in your HDMI AVR. If your AVR offers the ability to set different Crossover values for the different speakers then you can use that to get a better set up. The three Rules of Thumb I listed may help you in that.