Every room has acoustic problems, and whether to fix them electronically or leave the signal untouched is one of the most contested debates in audiophile circles.
Most of you know where I stand—fix the room—but that doesn't mean we can't have a look at alternatives.
The purist argument is simple and emotionally appealing. Any processing you add to the signal path introduces artifacts. Filters cause phase shifts. Digital signal processing converts your pristine analog or DSD stream into a manipulated version of itself. The fewer things between the source and your ears, the better the sound. I understand this position because I cling to it passionately.
Then I watched, learned, and listened as Chris Brunhaver spent serious time with our FR12 subwoofer's DSP controls and my path took a bit of a detour. For example, a room mode that creates a ten-decibel peak at 60 Hz is not something your amplifier or speakers caused. It is physics. Your room is a resonant chamber, and certain frequencies pile up at your listening position while others cancel out. No amount of amplifier quality or cable selection will fix a standing wave. It takes either physical treatment like bass traps, electronic correction, or ideally some combination of both.
Modern room correction systems have gotten remarkably sophisticated and I find myself wavering in the winds of change. The best ones measure the room at multiple points, identify problem frequencies, and apply minimum-phase corrections that address the issues without introducing audible artifacts elsewhere. Some (like what I've built in Maestro) work entirely in the digital domain before the DAC, which means the analog signal path stays completely clean. Others work after conversion, which is where we purists get understandably nervous.
The goal is not philosophical purity. It is finding the gentlest way to helping your room get out of the way.
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