The amp is an Infinity Kappa 4, sub is a Infinity Kappa 120.9. HU hasn't been decided as yet, probably a JVC XR816 (810 in the US) or a Clarion CX501.That's the entry level offering from Rainbow. While speakers give you sound, SQ is more than just your speaker / amp / hu. If I had to break it down I'd say SQ is 20% equipment, 30% speaker placement and install and 50% tuning based on dsp.
What do you have for hu / amp / subs etc?