Bose Loudspeaker Repairs
I had a pair of Bose 901 speakers to listen to, the sound was awful mid range and nothing else (almost). I checked the speaker impedance, it was correct at about 7.4 ohms. I decided to look at the equalizer; as well as the capacitors needing changing several resistors measured out of spec, after replacing them, the sound was dramatically improved. These were Series 2 901's but I guess most from the 70's will benefit from an overhaul.