It's not super clean. If you used one of these modulators you quickly see the drawbacks in quality of the sound and method. It's a good halfway point but if you desire better, you'll toss that FM frequency junk.
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Been using it for 6 months and it's clean, hence why I said they're definitely not like they used to be...and it's clean cause it resides in the center console armrest compartment, out of sight.