This screenshot from SMAART shows a reference of decibel levels (dB) and frequency (Hz) for four saved memories: a sub (orange), a top (blue), a sub + top (pink, before delay) and a sub + top (green, after delay). Digital processing has made it easier to add delay to multiple signals.
Time alignment is a very important yet often overlooked aspect of system setup and tuning. A correctly time-aligned system has many benefits, including more even coverage where two sound sources overlap and a more even response across acoustical crossover points. It can give the cheapest of systems a couple decibels more in the area where engineers tend to like them most: bass frequencies. So let's take a look at subwoofer time alignment.
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