Totally re-engineered, this 4th generation of the legendary R1000T series has been released to incorporate up-to-date features such as our enhanced Class-D core amplifier with built-in DRC controller, automatic switching power board, efficient SMD manufacturing, the next generation of 3/4 inch natural silk dome tweeter drivers, and so on. They also inherit classical features of the R1000 such as Dual-Stereo RCA input, spring clip connection and backward bass reflector. Housed in 100% medium-density fibreboard (MDF), these bookshelf speakers are built to resist resonance.