No Bass in B&O m70 4 way speakers

Nov 26, 2018
I set up vintage B&O M70 model 6304 speakers tonight. Using a Yamaha CA810 amp. Speaker A is wired through a small subwoofer, then to a different set of speakers. Speaker B is direct to the B&O's. I have no bass whatsoever in the B&O's. Is there any possibility of subwoofer interference with either A or B. Speakers A a have strong bass and the sub works well. Is the sub sucking all the bass signal? These are vintage components so no surround or dolby digital or dts. Just plain two channel stereo. I find it hard to believe both woofers / connectors / crossover went tits up at the same time.
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