Budget SS integrated with great timing and immediacy up to 2k used?

I have heard immediacy and great micro dynamics in class A amplifiers only (especially single ended). I don't care for class D amps. Are there any classic class AB amps with good immediacy and microdynamics? I have efficient speakers but with low impedance down to 3ohm. So 25W in 8 Ohm / 50 in 4 ohm would be sufficient.