If you don’t mind an older amp, look for a Proceed HPA-2. it is 250 w/ch at 8 and 500 w/ch at 4 ohms, good down to 2 ohms and will drive virtually anything with a neutral sound and a black background. Know that you will be buying about a 20-yr old amp.
The good news is that its design shares the basic features of dual mono Levinson amps. There are three authorized Levinson service firms that will repair them, if needed, Pyramid Audio in Austin, TX is one of them and does great work, having used them myself. One warning - the amp weighs over 80 lbs. For any needed repairs, however, each of the two amp modules can be separately removed from the case. A local repair firm, technician or Levinson dealer can help with that. They are available used for under $1,000. I have one and it is still going strong. It is a great prescription for any low efficiency, power hungry speaker that requires high current.