Looks like we provided an overkill solution to your problem. FM is still the way to go since it seems the party won't be around the piano at Christmas but the piano music will be piped to the party.

Success depends on the distance to broadcast. My first try would be a cheap FM Transmitter found in the auto section at WalMart, Target, Best Buy or an Auto Parts store. They are not expensive. Try to get one with a digital tuner. It will come with a cigarette lighter plug to get power in a car. You can connect two Nine Volt batteries in Parallel (+ to + and - to -) which will give you 9 volts but more current before discharging. Tape the plus wire to the tip of the cigarette lighter plug and the minus wire to the metal strip on the side.

This should power the unit for a couple of hours while the party is ongoing. Test it first to be sure! You may have to move the power chord around a bit as that also functions as the transmitter antenna. Set the transmitter tuner on an unused broadcast channel and any radio you want to receive the broadcast to the same channel and you should receive a stereo broadcast signal from the transmitter.

The FM transmitter will have a stereo 1/8" jack. WalMart or any music store sells a 1/8" to RCA converter plug so you should be able to take a line signal from your mixer RCA jacks if it has them. The RCA outputs should be the same audio as your main outputs. If your mixer doesn't have RCA jacks. Take your output signal from an AUX Output rather than the headphone or main output because that will give you a line out. You will mix your output signal using the AUX Send knobs on each channel you want to use rather than your faders.

You can transmit further and your transmitter will broadcast longer if you have a 12 volt battery of some sort. Maybe a lantern battery or car battery.

Last edited by Charlie Fogle; 12/21/18 04:04 PM.
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