So the next question is what kind of mics were people plugging into boomboxes in the '80's and what was their impedance? The mic inputs on this unit are dual mono 3.5mm jacks. Ground Loop Isolator for 3.5mm Headphone/Minijack Auxiliary Aux Connections Conveniently Plugs Between Music Player And Receiver AUX Includes Male and Female 3.5mm Connections Creates 1.3dB Signal Gain for Improved Performance and Noise Filtration 7 In stock 14.99 (33.36 off) 9. On the LED recording level gauge, the Pi never gets above about 1/3 of the scale, while FM consistently reaches near the peak. When I switch from the Pi (at max output) to FM, the volume is noticeably louder and crisper. I'm not sure what kind of mics people were plugging into these things back in the day but I'm guessing they had a different output than the line level coming from my DAC. I have this setup so that the output from the DAC is soldered into the "Mic" inputs on the back of the boombox. However, I'm still not getting enough volume and I wonder if this is the impedance mismatch you mentioned. I found an old RC car battery pack in my parts bin and ran that to the Raspberry Pi. OK, so I temporarily gave up on getting this to work with a single power source.
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