External Speaker w/Filter Manual Frequency tailoring specifically intended for amateur and general communications modes. Wideband tailoring for: broadcast listening, music and FM reception. Independently-adjustable low-cut and high-cut filters offer twelve possible audio response configurations selectable from the front panel, enabling the operator select optimum response under all conditions and modes. Two separate inputs, selectable by a front panel switch. Two output jacks (1/4-inch and 3.5mm) for headphones are provided on the front panel. Adjustable front feet. Package includes: SP-8 Speaker, Patch cable (T9101275A), and instruction page