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Part# 11-00567
MFR Model# SPA-4S


The SPA-4S is a compact 2 or 4 place voice activated intercom with inputs for stereo music. It is a compact system that allows it to fit in space critical panels. The SPA-4S uses the industry standard Sigtronics squelch, fast on slow off for hands free communication. The music will full mute during ATC communication and partial mute during intercom communication. When radio / intercom use is ended the music will gradually return to its previous volume.

Easy Upgrade
Each intercom comes complete with all necessary mounting hardware, jacks, and two 4-foot pre-wired harnesses. The SPA-4S only requires 1 X 2.5 of panel space, mounts horizontal or vertically, is 4 deep, and weights 5.5 oz. The SPA-4S intercom can easily upgrade the SPA-400. The SPA-4S uses the same panel hole pattern and interface cable as the SPA-400. A second cable is provided for the music inputs and headphone outputs.


  • FAA TSO approved.
  • Pilot fail safe feature allows pilot to always hear radios.
  • Use Satellite Radio, MP3 or CD players as audio source.
  • Reversible face plate included for vertical or horizontal mounting.
  • Radio priority assures that ATC hears only the crew member transmitting.
  • Installation hardware included, including jack kit and pre-wired harness.
  • WARRANTY: Five years parts and labor.


  • Headset Positions: 4
  • Stereo: Yes
  • Size: 4" x 2.5" x 1"
  • Unit Weight: 5.5 oz.
  • Jacks/Harness Weight: 7 oz.
  • Warranty: 5 years
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Q: Does the Sigtronics SPA-4SN (11-00568) include a wire harness and panel jacks in the box?

Yes, both wire harness and jacks are in the box.

Q: Is the Sigtronics SPA-4S stereo intercom FAA TSO'd?

Yes, this unit is TSO'd.

Q: Does the Sigtronics SPA-4S stereo intercom come with 4 jacks?

Yes, 4 jacks are included.

Q: Is the SPA-4SN also TSO?

Yes, both units are TSO approved.

Q: Can the Sigtronics SPA-4S intercom be used with monaural headsets or does it require stereo headsets?

The SPA-4S is for stereo headsets, Please view the SPA-400 p/n: 11-02791 for the standard version.

Q: Can the SPA-4S be used in Certified Aircraft?

Yes, part # 11-00567 is FAA TSO approved.

Q: With this Signtronics SPA-4S intercom can work with old radio King KX-170B?

As long as the wiring is done correctly, it will work.

Q: What gauge of wire are the wire bundles that are included in this Sigtronics SPA-4S intercom?

Per the manufacturer, 22 gauge wire is used for the harness.

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