The T-matrix method[1][2] has been a useful tool for studying the acoustic and electromagnetic interaction with a many-body system. One drawback, however, is the high cost of solving the resulting system of linear equations. The computational cost is proportional to N3, solved directly and to N2 per iteration, solved iteratively, while the memory requirement scales as N2. Here, N is the dimension of the matrix and is often very large since it is proportional to the total volume of a scattering object. As a consequence, the O(N2) storage scaling severely limited the technique's use to electrically small problems. Recently, the FFT T-matrix technique[3][4] was introduced to reduce the CPU-per-iteration and memory requirements to O(N log N) and O(N), respectively, making the method significantly more useful.