The closed-back SUNDARA shares the same DNA as the SUNDARA open-back but with structural changes to the new SUNDARA with its closed-back design and hand-assembled wood grain ear cups. The differences are that the open-back SUNDARA is a tat-bit wider and has an expansive soundstage which does not mean that the closed-back lacks depth. The closed-back SUNDARA is equally expansive with precise imaging. You can use the closed-back SUNDARA when you are on the move as it does not leak sound; when compared to the open-back SUNDARA.