Hi: A new member who knows nothing with a question: I have (4 each) 4 OHM (25Watt) Shakers that I am installing in a massage table for a research project involving tactile low frequency impulses. My PA is 125 watts per channel (250 total) or 350 watts bridged at 8 ohms and its speaker impedence is from 8 to 16 ohms for channels A + B or bridged. So there appears to be plenty of power for any possible circuit. All shakers will output the same signal/program. My question is what wiring schematic would optimize the shakers output. 4 individual (left and right on channels A and B), all 4 in series bridged, just channel A with 2 in series on left and and 2 in series on right, or 2 in series on channel A right and 2 in series on channel B right? Thanks in advance for your help. Ted