The HTM1D is the largest of four centre speakers in the 800 Series. The full configuration of FST™ midrange in a Marlan® sphere / tube ‘head’ with diamond dome tweeter on top is used, so that the system perfectly voice matches either the 800D, 801D or 802D in a substantial and powerful multi-channel installation. The HTM1D uses three 8” diameter Rohacell® cone drivers with twin rear-firing Flowports™. All drivers are, of course, magnetically shielded to avoid picture distortion with CRT-based screens. The HTM1D is specifically intended to be mounted on the floor, its low profile allowing a large projection screen to come within 2 ft. of the floor. Supplied with the system are four heavy-duty height-adjustable feet. This design allows up to 1.6” of vertical adjustment so that the speaker may be tilted back to face more towards the listeners. They have a case hardened spike at one end for carpeted floors, and a non-marking rubber pad on the other for more vulnerable surfaces.