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After reading "Sound Reproduction" by Floyd Toole, I've learned that it looks like the only reliable way to get a reasonably flat and efficient low-frequency sound field in more than a small listening region is to employ what Toole calls "Sound Field Management." Done properly, four subwoofers would be installed and a DSP optimization algorithm would be run to adjust a very fine tuned parametric EQ + delay using feedback from multiple microphones. The end result would be an appropriately sized listening area across which bass response is maintained.

The JBL BassQ system was apparently designed to perform exactly this job, and was relatively affordable at $1,200 retail, but apparently was discontinued at some point in the past five years. I've learned that Harman/JBL Synthesis apparently uses this technology in their ARCOS adaptive room correction system, but it looks like the cost for this system is at least $5k in processing hardware, well out of my budget.

Are there any DIY/lower cost tools to accomplish this?
 
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