AVS Special Member
Join Date: Mar 2002
Location: Greensboro, North Carolina
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I have the same HK reciever with my LFE out split and fed to both my subwoofer and to the plate-amp that powers my shakers. I have not found any need to add any "fmods"
I would say give it a try without them. As you said, there is already a low pass filter on the LFE output of the receiver. Odds are it will do the trick. You can always add one later if you feel there is too much high-frequency signal fed to the shakers.
Many receivers put the A+B speakers in series to provide for an easier load. If the manual did not say anything about 4 ohm loads, the odds are it was not rated for 4 ohm use.... but... that does not mean you cannot use it.
From what I've experienced, the shaker amplifiers pretty much are loafing 95 percent of the time. It is a rare action sequence that will last any length of time at all. Therefore, you probably will not be stressing the amplifier power supply even if you connected a 4 ohm load where the manual only described 8 ohm speakers. Although there is some risk, If you are brave, try it. Just increase the volume till you get the desired shaking effect and don't crank it all the way up (you probably won't need to anyway)
If your amplifier experiences a meltdown, then it probably didn't have any protection circuitry and was not going to last long with anything less than a 8 ohm load... In that case, you have an excuse to get a better amplifier.
How many shakers will you be running?