FM Direct Adapter Compatible with All SIRIUS Plug and Play and Personal Radios

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Eliminates outside static and interference sometimes experienced with a wireless FM connection. Connect your Sirius radio directly to your car radio via the antenna jack. Compatible with all Sirius brand Plug & Play and personal radios. Includes the plugs and wires required for most installations. The direct connection eliminates the need to find an unused FM station and provides better performance. It directly connects the "FM Out" signal from the satellite radio receiver unit's internal FM modulator to your car head unit's FM antenna connection. An internal relay switches between Sirius operation when your receiver is powered "on" and AM/FM operation when your receiver is powered off, so you can still listen to your AM & FM stations. Product Features:
  • FM Direct SIRIUS Adapter
  • Compatible with all SIRIUS plug and play and personal radios
  • Directly connects to the "FM Out" signal from the plug and play unit's internal FM Modulator to the head unit FM antenna connection for superior audio performance.
  • Internal relay switches between SIRIUS operation when plug and play radio is powered "on", and AM/FM pass-through operation when plug and play radio is powered off.
  • 1-year warranty
Kit includes:
  1. FM Direct SIRIUS Adapter
  2. 2 feet FM antenna cable
  3. 19.4 feet Mini-jack cable


  • All SIRIUS Plug-n-Play Radios
  • XM onyX Radio
  • XM Xpress RCi Radio

*May require an additional antenna adapter to connect to the radio in some vehicles

FM Modulator / Transmitter Specifications

FM Modulator Type
This describes the kind of FM modulator or transmitter.

FM Modulators typically wire directly to the radio and provide an input source to the stereo. The input is activated when the stereo tunes into a specified frequency. These usually require some intermediate installation.

FM Transmitters broadcast a signal that the radio is able to pickup via the antenna. Typically, these are more popular due to the easy installation.

Number of Frequency Channels
This is the total number of frequency channels that the item is able to tune into. This feature is common among FM modulators and transmitters.
Input Connection Type
This is the type of input that the unit accepts for its audio or video (if compatible).
Power Source
The power source is the method in which the unit receives power. Some units will be powered by batteries, while others will need to be plugged in to an AC or DC power source.
Made for iPod
This means that the item is designed for specific use with an iPod.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: SIRIUS FMDA25 (SIRFMDA25)