An SPL meter can benefit the set up of speakers of any sort simply by taking the guesswork out of the process.
By playing the test tones and recording their levels, you can plot a graph to see where the best position is. Whilst the MkI Ear is good at telling if there is a difference, it's not so accurate at telling what that difference is.
Guessing crossover the crossover point is a fine example. Crossover too high and you'll get too much bass from the combined output of sub and speakers - crossover too low and you'll end up with a dip where neither are contributing enough. Phase adjustments are even harder to guess, with multiple dips moving around all over the place for very small adjustments of the control.
IMHO, these are reasons why the walk/crawl method beloved of the stereo hifi press is such bunkum; Even if you can hear a dip, how can you tell easily and quickly what's causing it? I've expanded on the other short-comings of the method in my blog.
As regards an EQ device; It
could benefit the quality of bass, but only if any issues can't be sorted by proper setup in the first place. Less is always more if you can get away with it.
Russell
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