AW Ultra 2's speaker loudness is weaker than AW S7 when system announcement is played

I just upgraded my AW from S7 to Ultra 2(2024 version) recently, I just realized that the speaker loudness between Ultra 2 and S7 is not comparable, Ultra 2 is way more weaker, particularly when you ask Siri and get his feedback or you have workout and the system announcement come out when you achieve the milestone.

I went to Apple Store and compare my Ultra 2 with the same model in store, these two are comparable which is lower than my S7 in terms of the speaker loudness.

I'm not sure if anybody else who from this community encountered this and has experience for how to improve it?

Hopefully, it's just the software issue more than hardware design as I'm assuming that the Ultra series should more powerful than other series from design perspective.