Yes- Any source will do, and- the more bass the better. If you place them facing one another, close together, with one cabinet hooked up reverse polarity: You can play them louder and shorten the process. The out of phase wave fronts will cancel some of the sound, and it won't drive anyone quite as nuts. The caps in the crossover will be "burning in" as well as the suspensions of the drivers "breaking in". More power = faster results.
