Sidebar 3: Measurements
Before JL's Digital Automatic Room Optimization, D.A.R.O., (fig.1, dotted red trace), a large, broad hump at 32Hz and two nulls at 66Hz and 84Hz dominate the sub-100Hz range. After D.A.R.O. (solid blue trace), the 32Hz hump is mitigated and the range below the nulls is flattened and extended. Note that, as positioned, the single subwoofer cannot significantly reduce the two main nulls. Note the smooth low-frequency extension to below 15Hz, impressive for a single 10" driver.
Fig.1 In-room low-frequency response of single JL Audio f110v2 subwoofer before (dotted red trace) and after (solid blue trace) running D.A.R.O.
The single f110v2 plot in fig.2 (dotted red trace) is the same as in fig.1. Because three subwoofers (solid blue trace) can energize different modes to different extents by feeding in energy from different locations, this arrangement, in contrast to the single-sub arrangement, is able to mitigate the two main nulls. Also note the further flattening at the lowest frequencies.—Kalman Rubinson
Fig.2 In-room low-frequency response of a single JL Audio f110v2 subwoofer (dotted red trace) vs three of the same subs (solid blue trace), positioned as described in the text, both with D.A.R.O. equalization.
