According to Doug from SVS in most cases more than 18 reading even across multiple seats leads to diminishing returns. Some things I’ve read in the Audyssey thread at AVS suggest that you can even get negative returns from taking to many position measurements over a complex seating arrangement like and “L” shape. Though I haven’t tested it I don’t thing there is actually much advantage to more than 8 readings if just calibrating for one seat in the sweet spot certainly more than 18 would be wasting time from what I’ve learned.
The problem with EQ over multiple seats is boosting or cutting a frequency for one seat will do the same for other seats which might have needed the opposite. That’s why Doug said to me the AS-EQ1 works best over multiple seats when using 2 subwoofers. Which agrees with the paper I was just reading, the one titled “Low-Frequency Optimization Using Multiple Subwoofers.”
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