First - Welcome to AH!
if anyone is curious my car audio setup consist of the following 2-way active setup
Morel mdt-29
tc sounds 5400 15"
One thing should be said right away - while your car audio experience could be helpful, home audio is quite different.
This forum is very light to near non-existing car audio enthusiasts, but few of your car components do sound familiar to me:
Morel - they are really solid Israeli audio speaker manufacturer - truly one of top dogs quality wise.
as TC Ultra LMS 5400 18" - around here - this beast is legendary - as it be easily adopted to run as Home Sub.
Rojo's advice is solid - these DIY projects provide HUGE bang for your buck.