This copy is from the original Heathkit advertising literature.  

The extremely popular Heathkit model SS-1 Speaker System provides amazing high fidelity performance for its size. This is made possible by the use of high-quality speakers, in an enclosure especially designed to receive them.

The cabinet is a ducted-port, bass-reflex type enclosure, measuring 11½" H. x 23" W. x 11¾" D. Total frequency range of this unit is from 50 to 12,000 CPS. It features an 8" mid-range woofer to cover from 50 to 1600 CPS and a compression-type tweeter with flared horn to cover from 1600 to 12,000 CPS. Both speakers are by Jensen. A variable balance control allows level adjustment of the high frequency speaker. The cabinet is constructed of veneer-surfaced plywood, ½" thick, suitable for light or dark finish of your choice. All wood parts are precut and predrilled for easy, quick assembly.

These Jensen drivers were also found in the Heathkit SS-1s, Jensen Duettes and certain Eico Models.   

For anyone interested in a stereo pair, a separate set of these same Jensen drivers, without the cabinet, is available on this website.  Constructing a copy of this cabinet would be relatively simple.