Aah - so you will have Dirac. Ilf that's the case, you can definitely eliminate the controller, it i just an additional piece of analog electronics to degrade the signal. Dirac will do the distance calculation to properly integrate your sub. I'm not familiar with the theta implementation of dirac, but with the datasat, you can then additional adjust the delays if needed after dirac has done its thing. This can be really helpful with sub integration, however, dirac should do it correctly or get it close enough that you can make very small adjustments from that starting point. Also, play around wit the crossover frequency of the sub to mains - don't assume 80 hz will or will not be best - depends on the room interaction.
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