I'll have to try that and see how it works in use. Since with the fronts set to "small", sub set to "yes", and Bypass mode used on the Analog CD input, it would be sending full-range to the front L/R and the sub. Since the B&W 804S says it goes down to 38Hz, and the active crossover on the LFM-1 Plus can be set from 40Hz to 180Hz, I'd have to set the active crossover just slightly above 40Hz (such as 50/60Hz). If I set the active crossover on the LFM-1 to 80Hz, then everything below 80Hz would be output by the 804S and the Sub, even though the sub would be going lower than the 804S. That would be like having "double bass" between 38-80Hz

B&W 804S Specs Sheet