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Either there is NO bass on the recordings (if you listen to it with headphones does it have bass?) ...OR...you've wired them out of phase. Connect only one(1) Bose 901's to just one side. Is there bass? Then connect the other side. IS there bass? If not reverse the phase (+ /- connections) and see if the bass comes back. Once that is done and there is BASS, then add the 3rd and then the 4th speaker. .Are you sure your Sansui can handle a lower than 4 ohm load???
try reversing the polarity on one speaker.
they might be out of phase.
what happens is the speakers cancel out.
put the balance to one side,and if it has bass,then that is the problem.
if there is no bass with only one playing,then phasing is not the problem
Both of your problem amps were made in the '70's or earlier. It is entirely possible that the coupling capacitors are failing. This is an issue for a service center whether it is caps or something else, like failing tubes.
The good news is that installing metalized polypropelene capacitors will make those classic amps sound incredible.
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