Specifications

Secrets Product Review
Velodyne SMS-1 Digital Drive Subwoofer Management System
Part III
December, 2005
Roger Welch
I had previously determined what I felt was the best position for the subwoofer using a
good deal of trial and error, just listening by ear. This turned out to be between my front
left speaker and the center channel. I had also calibrated the relative subwoofer level
using Video Essentials and a Radioshack SPL meter.
Until the arrival of the SMS-1, this was the best that I could achieve. I could hear that the
response was not flat, but there was little I could do about it. The SMS-1 demonstrated
all too clearly the lumpiness of the response with peaks at around 22 Hz and 40 Hz, as
well as dips at 50 Hz and 85 Hz, as shown below in the screen shot.