The SP1.7 does NOT allow use of the sub while in 2 channel bypass. The signal does not pass through anything but an analog volume and balance. It sounds fantastic in two channel bypass and you can bypass any analog input at any given time BTW. You can select 2 channel un-bypassed output which gives subwoofer output. Strictly speaking, it isnt "bypassed" if the signal passes through a DSP chip.
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