TIME OUT! - I have a Hifonics Zues 606 ( 600rms )... And it's killing my 12" CVRs - I added 2 more 12s to it.. And it's AMAZINGLY loud.. ( But the Zues is better than the Brutus by a long shot - But the BRUTUS 2000D ain't a PUNK by no means. ) It'll be able to handle 8 honestly... So 5 wouldn't be a problem... Except for it's gonna be @ an unstable ohm load!
... With 5, it should get pretty loud... ( should is key word )