[RP-400C vs RP-504C and LG 55"]

I went into the manual setup and increased the central speaker, reduces the volume on the side speakers. 

It is definitely a lot better than it was.

[RP-400C vs RP-504C and LG 55"]

I have a my RP-400c connected to the central channel on a DENON AVR-X3700H, which is connected to a 55" LG tv.

While my Left and Right speakers are fine for watching movies, when it comes to dialog it is incredibly low on the central RP-400c despite turning the sound level to max and trying to get dynamic sound.

Because of this I can't use the speakers at all for watching TV shows and movies, since the default internal speaker LG 55" 4K UHD Smart OLED TV (OLED55CXPUA)

is crisper louder dialog.

 

If I swap it out with a RP-504C will I get better dialog sound?