Bought new Denon receiver. Hooked up main speakers

Bought new Denon receiver. Hooked up main speakers to speaker A and 3 sets of small speakers (outside, living room and dining room (in wall) to speaker B. I use a splitter for the 3 speakers on B. The sound on A speakers is
much louder than those on B switch. Anything I can do to equalize the sound for both A and B
speakers. Had same problem with my old receiver
which had total of 300 watts. The Denon has 570
watts.