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. 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. Ground Loop Isolator Hum Eliminator - 3.5mm Jack to Socket Reduces Interference £11.99 Almost gone Free postage GROUND LOOP ISOLATOR 3.5MM P-S - PLS00548 £16.84 + £3. 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. On a Mac, if youre using the Apple power adapter without the extra power cable (with a 3-prong plug instead of the 2-prong plug), you may get a buzzing sound. Accepts speaker level input and provides stereo RCA output signal for adding an. Solution: about 99 of the time, the problem is fixed by simply plugging the laptop into a grounded (3-prong) outlet. I have this setup so that the output from the DAC is soldered into the "Mic" inputs on the back of the boombox. Line out converter for factory radios with 2 to 50-watts per channel. 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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