AVS Forum Special Member
Join Date: Mar 2002
Location: Greensboro, North Carolina
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Unless the receiver was designed to be bridged, I think that there are some odds that could be a costly experiment.
On the other hand, since on many receivers the negative binding posts are ALL connected to a common point, your suggestion will probably result in one channel driving the shakers, not two as you might think.
To "bridge" an amplifier it must be stable into 1/2 of the resistance of the load. Since he is looking to use three shakers, if all are in series it would be a 12 ohm load. He stated his rx could output 120 watts into 6 ohms so you are probably ok there IF he wires all three of the shakers in series.
To "bridge" an amplifier, the two output channels must be driven "out-of-phase" with each other and you would connect the speaker/shaker the two "positive" binding posts. In other words, as one channel is at its peak positive output, the other must be at its peak negative output. There is no provision in any receiver I've ever seen to invert the phase of one channel, unless it was specifically designed to be bridged. You can purchase an external audio phase inverter, but it is not something you will find in Radio Shack or Circuit City. You definitely cannot use a "Y" adapter to feed the stereo inputs from the LFE out of the main receiver.
Rather than bridging his amplifier, the simplest solution is to wire all three shakers in series and put them on one channel of the Teac receiver. Odds are very high that there will be plenty of power to shake the change loose from your pockets.
Opening scene in the "Italian Job" scared the sh.t out of both my wife and myself when the first explosion occurred. The shakers make a HUGE difference.