Is the victron cyrix ct 500a the right choice or do i need another product

Hi I’m doing a car audio install it will have a high output alternator 300-370a with a 170ah slimline agm
and a 4kw monobock half bridge d class amp and a few RD400/4’s will be using 2/0awg
But between the starting battery and rear 170ah agm I was thinking of running a Cyrix ct 500a but not sure if it will work as I want it to want to cut the front battery off if: the voltage gets low
Also would like to and keep rear battery topped up when alt is under load not sure if the Cyrix will cut off and on I can’t find much information about it tried looking for a product video about it and can’t seem too find one

What do you all think is the Cyrix ct 500a the right choice or is there another victon product that would work better no dc-dc chargers as there is none with in my budget that could provide the current I need from the alt as it will be 300-370a

Cheers Ricky

I mean Cyrix ct 400a not 500a my mistake sorry

Or would a 230a work