Make sure the jumper is tight, (and/or even installed).
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The only possibiliy i see, apart from a broken resistor or connection in the crossover is the cable which runs from the crossover to the quassi ribbon section. Easy to analyze, just unscrew the crossover plate and tilt it out. To see the connection to the QR, you have to remove the side rails, untack the bottom cloth and strip them ;-)