What is the Make and Model of this speaker?

Those quad specs seem odd.  IThe one speced must have a very weak power supply. If so, the quad mode should work better.  My Fisher had 35 wpc x 4 or 90 wpc x 2.  My old Bryston 100 watt amp (3B) is 100 per in stereo and 400 in mono, i.e. two of these would be 100 x 4 or 400 x 2.    

I LOVE my Dahlquist 20s. I’d love to get a pristine pair of 10s.

You can get a pair of ADS 810s 710s or similar
They sound as good or better than some Speakers in the several thousand range.