Because it was the first system to gain THX approval, the 4675 system described here was subsequently  “copied” numerous times by both domestic and foreign suppliers in an effort to gain their own THX certification..

Using state of the art JBL 2226 low frequency drivers and the equally regarded 2446 high frequency compression driver, the system is capable of mid-band instantaneous peak levels of 105 dB at a distance of 20 meters (66 ft).

The system is designed for bi-amplification. The enclosure is ruggedly built, and the integral horn mounting bracket, model 2506, facilitates precise horn aiming.