mdodgeknee OP
Because they are quite hard to drive in the bass as Stereophile says, you need an amp with good current drive at 4ohms to get the very best out of them.
A used Parasound Hint would do the job very nicely, and the early ones should be around the $1k mark, and you get remote and ESS Saber dac in it also https://parasound.com/hint.php
The electrical phase angle is generally mild, but the combination of 5.3 ohms and –41° at 135Hz, a frequency where music often has high energy, will make the speaker work at its best with a good, 4 ohm–rated amplifier.
Cheers George