Sound quality on the KM18 is sharp-songs have no noticeable tinniness, vocals are full, and bass thumps without warping. Lastly, we measured the built-in microphone clarity and quality by comparing recordings through the voice memos app. Next, we benchmarked their signal strength by tuning into a channel with a strong frequency to see which models were strong enough to beat out those waves, while analyzing sound quality for static or imperfections. We drove around with each model for a week to get a general baseline for everyday performance. We assigned a score to design, features, and, most important, sound quality. We plugged the best-selling Bluetooth to FM car adapters into an SUV using the same lighter port and radio station. As you drive through a major city you may notice competing broadcasts break through so you might have to adjust stations more frequently. Now you can play audio clearly through the speakers. Once you set the adapter to this empty station you should hear silence which means you’re connected. In our experience the lowest frequencies (usually between 88-95 FM) work best since they’re often the least saturated. This indicates a weak signal that’s ready to be overtaken by the transmitter. Scroll through channels until you find one filled with the crackling static of white noise. How To Use A Bluetooth To FM TransmitterĪfter plugging an FM transmitter into your auxiliary power outlet (commonly referred to as a cigarette lighter) you'll need to find an unoccupied radio station. Some models even support listening to music stored on a USB flash drive. These models relay audio from inputs such as a Bluetooth connection, auxiliary port, or SD card. Their range is typically limited to the proximity of your vehicle. Bluetooth to FM adapters work the same way, but at a smaller scale than commercial transmitters which can extend for hundreds of feet. Behind the scenes an FM transmitter is transforming the audio output from a source like a computer or auxiliary connection to analog sound waves. If you’ve ever been to a drive-in theater or cruised through a holiday light show you may recall having to tune your car radio to a specific frequency to play synced up audio through your cars speakers.
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