I used a black horizontal KALLAX shelving unit for hifi set-up with a subwoofer cabinet. I had to remove an interior floor to place the subwoofer while retaining the original KALLAX design. With the small tweak, it perfectly integrates into the KALLAX compartments.
IKEA items used for subwoofer cabinet:
Related: Make a movable hi-fi rack in 30 minutes
To give character … I used wood imitation tiles, glued onto the KALLAX. I added aluminum rods to strengthen the furniture design. The result is a discreet hi-fi set-up, refined and perfectly integrated.
~ by Alexander
Related: A BESTÅ media / hi-fi storage furniture