Analysis - Benefits of Multiple Subwoofers
The purpose of this post is to show the interaction of multiple subs in the listening environment, and how careful placement and tuning can result in a significant improvement in bass response. The subs used in this analysis are four Hsu Research ULS-15 sealed subs. The subs are placed in the listening room as per the diagram in the first post in this thread. The two front subs are at the 1/4 and 3/4 spots along the front wall, and the two rear subs are collocated at approximately the center of the back wall. The two front subs are equidistant from the MLP, and are connected to the sub1 input on a MultEQ XT32 AVR with Sub EQ HT. The two rear subs are also approximately equidistant from the MLP, on the Sub2 input on the AVR. The two front subs are gain-matched to each other, and the two rear subs are gain-matched to each other. However, the level of the rear subs is 5dB lower than the two front subs, because they are significantly closer to the MLP.
The measurement of the subs independent of each other, and as front and rear pairs, reveals that the in-room response (without room correction) is not very smooth.
However, when all fours subs are driven at the same time, we start to see advantages in the summed response:
And Audyssey room correction puts the final smoothing on the response:
And finally, combined response including center channel:
This analysis clearly shows the benefits of multiple subs in the listening environment.
Edited by AustinJerry - 3/11/14 at 8:18am