Note
The HS-1661 was released as a companion for the HW-104 but also served with the HR-1680 and even the venerable HW-101.
The HS-1661 contains only a 5 x 7 oval speaker. Note that the cabinet is too small to accommodate the HP-1144 power supply used with the HW-104. The speaker has a 3.2Ω voice coil and a frequency response of 300-3000 Hz. The magnet weighs 3.16 oz. Finished in wrinkle green.
References:
Review. QST. Jan-77, p. 35.
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.