First of all , the JBL 4333A had 15 inch woofers , the bass was at 35hz , no way the Heresy 4 can do the same with a 12 inch woofer , you would need a Cornwall 4 -
as far as power , I would say both of your speakers would benefit from more SS power, The Heresy 4 , need a 100 watts amp minimum , the Chorus 2 ,needs clean power 150 watts ,per channel minimum , it can handle 400 watts peak , and had very good bass with a higher power amplifier ------the more , the better