Amp with speaker INPUTS?? Please explain!

I’m not sure if the reply was AI generated or not, but he’s not wrong.  It’s a very rare beast, and the "idea" was to sell amps to enthusiasts with existing receivers. It was rare in those  days to have a receiver with a true pre-out so these amps would provide a relatively high resistance load (800 Ohms I think or more), letting your receiver cruise, while using all the tone and volume controls.  

I’m thinking of the days of dbx speakers and a mail order catalog back in the day.  Fun times. 

Alternatively they could be used for multiple zones, letting you use your receiver for the main speakers, and having additional speaker pairs. Again, idea was to use the receiver's tuner/preamp section.  A typical Tape out/In would not work in these cases since they were before the volume and tone controls. 

You're welcome. I guess? 

Way to be rude with your very first post.

@erik_squires 

You are correct, @sls883 gave the answer, I'm glad you went a bit further with the explanation, I never heard of such a thing, makes sense in the timeline of things..

Around this time Carver was selling the idea that too much power was not enough, so these amps were on the leading edge of audiophiles attempting to up their wattage.