These custom designed premium Subwoofer enclosures are perfect for the MTX Audio range of Subwoofers, from RoadThunder to the TX8 Series these boxes are ideal, we recommend a custom enclosure for the RFL Competition Subwoofers if you're powering them with over 2000W RMS each. These enclosures feature a very wide output bandwidth, allowing you to play low frequency bass as well as high frequency bass with snappy response.