No, I have not tried the resistor, although I was aware of it. Recently I have got a Behringer DEQ2496 which is giving me fantastic results (and is great fun to play with). Just know I am working on the Behr in order to integrate my subwooder (a SVS PC+) to the Gallos and I am very happy with the combo.
The only reason why I want to go the the Gallo sub amp is because my actual sub is extremely bulky; also I can slightly detect the direction of the bass coming from the side and it is slightly annoying with music, while with the Gallo SA I should get the feel of the sound coming from the two speakers. The only thing that worries me is that I have not found many comments at all about the Gallo SA in the web
The only reason why I want to go the the Gallo sub amp is because my actual sub is extremely bulky; also I can slightly detect the direction of the bass coming from the side and it is slightly annoying with music, while with the Gallo SA I should get the feel of the sound coming from the two speakers. The only thing that worries me is that I have not found many comments at all about the Gallo SA in the web