"Fractal has continued to be one of the PC industry’s fast rising manufacturers focusing immensely on enclosures and power supplies. What stood out most about the Define R4 were the use of Bitumen sound dampening materials on both side panels and the front door. This is great for anyone with a need to quiet down their system. While the Define R4 enclosure is intended for regular end user purposes, the Define XL R2 has a larger (XL) role in supporting larger systems and a larger number of components as well."
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