I still have a set of these
DR 1550R from DAK catalog - these things are huge, heavy, not particularly beautiful, but they are LOUD - when i got them, I put them on the front porch of my folk's house, cranked them & started walking away to see how far i could hear them well - i was half way down the lane, which is 3/10 mile long & could still hear them very well (they live on a farm).
As i remember, i might have paid around $150 for these things in the early to mid 1980's - and they are now relegated to the man cave, where i rarely turn it up that loud - I'll likely get rid of them when space becomes an issue - or maybe my teenage sons will need something that really cranks for a party - all for a good cause.