Next I'm going to throw my Braun L200s onto of my ADS810s and run them in parallel to get to 16 Ohms.... Actually, I only get to 12 Ohms with the ADS & the Braun, but its a step in the right direction...For the two impedances to add, the speakers have to be connected in series, not in parallel. Based on a quick Google search, it appears that the L200 and 810 have nominal impedances of 4 ohms and 6 ohms, respectively. In parallel that combination would have an overall nominal impedance of (4 x 6)/(4 + 6) = 2.4 ohms.
Also, using non-identical speakers in series is usually a recipe for poor sonics, as their differing impedance curves will cause the voltages supplied by the amp to divide up between them differently at different frequencies.
Regards,
-- Al