“will this work with the Alpine mrv-m500 or the mrp-m500 ? I'm worried that the fixed subsonic filter of the alpine mrv-m500 and the alpine mrp-m500 is set to low, I believe the subsonic filter is set at 15 Hz for these two amps so i'm thinking about buying the Alpine mrx-m55 because it has a variable subsonic filter. Does anyone know what Hz this sub box is tuned to? because I've heard that its tuned to high and also I don't want to purchase the kicker cx600 even though its subsonic filter is fixed at 25 Hz I will only purchase alpine amplifiers.”