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RE: Help Needed Selecting The Right Hi-Efficiency Subwoofer

Hi Tom
Unfortunately your room doesn't qualify for the free lunch ( good room gain).
I would have to agree with a bunch below, your best option is probably a self powered sub with an electronic crossover / processor.
You can build a high sensitivity subwoofer and use a passive crossover but that is more of a job than it sounds like and will be much larger than the alternative.

Subwoofers are the simplest loudspeakers to build, if you have had the inclination to build something, do this or maybe build a kit.

I would suggest also looking at a loudspeaker controller as used in pro-sound, these offer a wide variety of crossover slopes and frequencies and other such things which make it much easier to get a happy alignment.
If you went this route, build two,put one behind each of your speakers.

To get seamless results, you need to be able to measure the response at the transition area and if you can, set up one speaker and sub outdoors and get the time, crossover and level parts right before fine tuning indoors.

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