My guess is that both speakers have been miswired internally such that the two woofers in each speaker are being driven with opposite polarities. In other words, one woofer is moving out while the other woofer in the same speaker is moving in.
It might be possible to determine that by connecting wires to a battery holder containing a 1.5 volt battery, then briefly touching the wires to the speaker terminals, and seeing which way the two woofers move.
Regards,
-- Al
It might be possible to determine that by connecting wires to a battery holder containing a 1.5 volt battery, then briefly touching the wires to the speaker terminals, and seeing which way the two woofers move.
Regards,
-- Al