Best setup to introduce others to HiFi

I am trying to return to HiFi by resurrecting some equipment I used many years ago. Since I was "into" HiFi and left, I have lost a good portion of my hearing over around 10kHz, and added tinnitus to my soundstage. So I have lost some of my ability to appreciate music, and particularly my ability to detect some equipment weaknesses. However I recently have found pleasure in playing some of the music (vinyl) from my youth, from rock, jazz, symphonies, to opera. My equipment inventory includes a SOTA turntable, Denon head amp, Audio Research SP9, Premier FT3, Theta DS Pro Gen II DAC, Marantz model 15 (dual mono), a dead Aragon 4004 amp (probably blown output stage(s), Dalquist Subs, Dalquist crossover with 1 bad channel, and Magneplanar MC-.5/QR speakers.

My goal is to be able to show my kids (around 30 years old) that there there is something to HiFi, soundstage matters, and that music is not just to be played unobtrusively in the background, or loudly at a rock concert or disco. So I am planning on setting up what I can get to work in the living room for a few weeks or months, and see if I can persuade then to sit and listen. I think that the Maggies are not the best to start with as I have found them very touchy on where you listen. If I have two people listening, then one is not getting the full effect. I think that asking too much. So I am recalling speakers I have owned, specifically Ohm 8 speakers in around 1975.  Then Dalquists.  These, I think, did a better job of presenting a sound stage, although they may have had other deficiencies. I am sure others exist.

So, I am looking for suggestions of how to approach this problem - like should I replace the speakers, perhaps setting up my LS3/5A speakers instead (maybe the room is too big at 16x24')? What speakers generally are the best for novice listeners seated someplace other than the "sweet spot"?

Ultimately, I will probably move the turntable into our home theater and hope that the speakers I end up for home theater will be pleasurable when playing vinyl, if not the best from an audiophile standpoint as my ears may not appreciate the defect. . 

I also wondering if trying to get the Aragon 4004 repaired is worthwhile, given that it is very heavy, and I have not been able to find a repair shop in San Diego willing to tackle it. Perhaps it should just go to recycling?