Back then we didn't need subwoofers. Stereo speakers were designed to handle all the frequencies and a good pair of 3 way 12s or 3 way 16s would do it. Speakers were intentionally designed to NOT have flat response like studio monitors do, in order to enhance the low end as well as make sure the center of the vocal range (1k) was not too pronounced or burried. And of course stereos came with a loudness control that was used to enhance frequencies that are lost during low volume listening. Gear back then was great, it seems speaker makers and amp/receiver makers worked together so that the gear was all compatible. I still have a pair of Realistic Optimus T-100 tower speakers that were nothing more than 2 10s and a tweeter, and the things could rattle the windows. They made speakers very efficient then, you didn't need 200 watts to drive them louder than you want, 35 watts would do the job nicely with a 5 band EQ. And if you had a 60 watt receiver and 4 efficient speakers, you couldn't stay in the room with it. Also, now they try to make speakers like studio monitors, and studio monitors are tools, they are not for casual listening and sound like hell for home listening. I used to put my turntables either on some kind of home made damper such as two pieces of plywood with foam between them, or a concrete or marble slab to isolate them and keep the rumble down. I also normally had it far enough away from the speakers that rumble type of feedback wasn't a problem until it was cranked up, which , the stone slab took care of that. I know full well about the needle jumping from bass, I used an Audio Technica AT13EA cartridge and that thing would track at a gram, I always set it at a gram and a half. So I had to dampen the turntable with a slab. It didn't feed back too easily, but any minute shock would jog the needle out of the groove.