I use the LineX fm microtransmitter and it's perfect for the job, though even the cheaper ones such as the iCast will do the job well enough and unlike an attenuator, you can use the signal for multiple boxes at the same time. Try that with a plug in device and you'd only have enough signal for a couple before you had too little gain to be heard above the background hash.
9191 has a phono input on the front.
it also has a din type dubbing port on the back.
Just like mine.
I would use either the attenuation device I have suggested or
the FM transmitter as suggested above.
I believe the sound quality will be far better with the attenuator but the transmitter
will allow you to broadcast the signal to multiple boxes at once.
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