Apologies for typo.
I can confirm the below as I have reliable info for my dept (consulting) for the below numbers, which is less than $100 off the numbers provided previously:
A1- 4k
A2- 4.4-4.5k
S1- 5.3-5.5k
S2- 5.8-5.9k
AM- 6.2k-6.5k
M1- 7.3-7.7k
Please note that this is NOT assurance, this is for Business Consulting.

The other message with the following seems to be assurance (audit) pay from what I hear.
A1: $3.4-3.6k
A2: $3.6-3.9k
S1: $4.9-5.2k
S2: $5.7-6.0k
S3: $6.3-6.6k
M1: $7-7.3k

Please note that we had a adjustment in April this year with ~10% increases across board- understanding is that moving forward bonuses will be reduced (possibly no automatic 1 month bonus) in exchange for this. So this would likely account for the significantly higher pay compared to other B4.