Dave,
Yes in theory, but it very much depends on the room, finding the right volume, the phase- and crossover points , the proper placement of the sub(s) to get such a blend with the mainspeakers that the sub disappears. It is quite tricky to get it right. I would suggest to first get everything else right to sound to your satisfaction and then later play around with the deeper frequencies and ...if you can find a sub fast and controlled enough within your budget, aim for 20 not 30 hz.
Yes in theory, but it very much depends on the room, finding the right volume, the phase- and crossover points , the proper placement of the sub(s) to get such a blend with the mainspeakers that the sub disappears. It is quite tricky to get it right. I would suggest to first get everything else right to sound to your satisfaction and then later play around with the deeper frequencies and ...if you can find a sub fast and controlled enough within your budget, aim for 20 not 30 hz.