I did more research: The in wall Boston Acoustics are 8 ohm. Yes the AB is in series. When the switch is on A+B and all 4 speakers are hooked up, the A (Klipsch) speakers are barely audible. When I remove the B speakers, the A speakers totally cut out. I guess that just confirms the series setup. More details on the in wall speakers are below.
If the impedence difference is the problem, is there a way to hook up some sort of speaker switch to the inputs to level this out? Or do I need a receiver with AB in parallel?
Details:
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3/4" dome tweeter
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5-1/4" woofer
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handles up to 90 watts
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frequency response 75-20,000 Hz (±3dB)
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sensitivity 90 dB
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8-ohm impedance
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paintable speaker grilles
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cutout dimensions: 6-3/4" diameter
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mounting depth: 3-1/8"
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warranty: 5 years