The KAB RF1 website states that you can put it in either place. I'd recommend the tape loop so that you can easily try it both in and out of the signal path. IMO if it eliminates the rumble problem but effects other areas of the music than you will want to get an infrasonic filter that filters out anything below 20hz and does not mono everything below 140hz. IME there is stereo info at least another octave lower.
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