A pair of Boston Acoustics A-40's bookshelf. Matched with Technics intergrated and Sony 1-bit cd player and TEAC cassette back in the mid 80's. I remember setting the system up and calling my mom into the room to listen I hit play on Ozzy's Bark at the Moon cd and nothing came out. I turned the volume up but nothing. Then I noticed the input selector was not on CD so I turned it to it. . .but . . I had forgotten ot turn the volume back down it was at like 8 out 10. Scared the crap out of my mother and all I could say was cool. Speakers survived for 12 more years before the bass surround died.