Amp with speaker INPUTS?? Please explain!

The AudioSource AMP300 features dedicated Speaker Level Inputs on the rear panel, allowing connection from receivers lacking RCA pre-outs. These inputs accept high-level signals (speaker wire) and can be routed to either the main or interrupt input, with a line select switch for easy configuration. 

AI generated reply. Thanks, I guess? 
 

If anybody has any first-hand experience with these inputs, I’d love to hear about it. 

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.