I just heard the B&W PM1s this past Wednesday mated to B&W's own PV1D subwoofer. This was a superb ensemble, and there was no lack in lower midrange, upper bass, lower bass, or pretty much anything else. The specs of the 805 and PM1 are not that different in frequency response and power handling. In fact the PM1 specs claim more treble extension. The main difference is that the PM1's sensitivity is rated at 84dB vs. the 805's 88 dB. Other than that, they're both linear down to around 42 Hz.
The PM1 goes deep enough that blending it with a good sub shouldn't be a problem. As much as I like JL subs, the all-B&W rig I heard Wednesday sounded so good I'd recommend you audition the PM1's with the PV1D sub before automatically going with the JL. The integration was superb.
At any rate, I'd go with the PM1's and a good sub. The PM1's draw you into the music with linearity, speed, punch, smoothness, extension, clarity, and excellent soundstage and imaging. I was very impressed.
The PM1 goes deep enough that blending it with a good sub shouldn't be a problem. As much as I like JL subs, the all-B&W rig I heard Wednesday sounded so good I'd recommend you audition the PM1's with the PV1D sub before automatically going with the JL. The integration was superb.
At any rate, I'd go with the PM1's and a good sub. The PM1's draw you into the music with linearity, speed, punch, smoothness, extension, clarity, and excellent soundstage and imaging. I was very impressed.