Amp change/upgrade for JBL4367 (94dB 2Way with Horn tweeter & 15" woofer)

Thanks. I don’t quite understand the advantage of say: 30 W class A vs a 250W class A/B. Isn’t the class A/B has the advantage of both ? Example:Pass Int 250 don’t leave class A till 15 W and has all the extra class A/B reserve up to 500 W into 4 ohms! Why would a 30 W class A be a better choice over the 250 W A/B???

Thanks all for your inputs. I am amazed no one recommend Mark Levinson. The main reason I included Mark Levinson is: 1)JBL & ML are under same company: Harman. 2) Most high end audio shows JBLs are paired with Mark Levinson. 3) ML has great reputation of sound quality. And last 585 integrated with DAC for $5500 used is quite a bargain (compared to Pass int 250 $7000 + DAC )