A thought on the DWM panel - base below 60 HZ is non directional and placement, as long as the filter is set at or below that, isn't really critical. I am not particularly familiar with the DWM panel but I am using a ADS Sub 12 with my 1.7 and It integrates very well, as it operates only between 20 - 60 HZ. icanskate mentioned a PSB sub that also integrated very well. Some believe that a cone woofer isn't quick enough to integrate with a ribbon or electrostat panel. The truth is - there is nothing quick about 20, 30 or even 40 HZ; it's all about producing those low frequencies and moving air in a given amount of space. I believe that the DWM panel/panels would work well and should be fairly flexible with placement as long as operating below 60 HZ. The 1.7s have a very good mid base down to about 50 HZ so any quality sub used only to augment frequencies below that, should work very well, with a minimal amount of critical placement.
Jim
Jim

