The anti-shock system of the DMX-S1 keeps your CDs from skipping. The blue LED level meter of the DMX-B1 lets you know visually when frequencies are peaking. The illuminated control buttons of the DMX-S1 make it easy to adjust things in the dark. The Technical Pro DMX-S1 lacks the dual USB inputs of the higher cost DMX-BP3. The DMX-S1 has the same specs as the identically priced DMX-B1, but with a different external design.