Uploaded April 2016 | Updated September 2026, 1 week ago
Cassette unit sounded dull even after cleaning and demagnetization of the head. The music cassette sounded good on another boombox, so I could reasonably assume the cassette tape itself was good. I then made some low- level recordings (each a few seconds long and at -20 dB) at different frequencies starting with a 1000 Hz sine wave for reference purposes. I then made short 7,000, 8,000, and 9,000 Hz recordings. Already at 7,000 Hz the signal had dropped to 50 %. I then proceeded to make an azimuth adjustment with a flathead screwdriver and using a prerecorded 3,000 Hz cassette, because the 6,300 kHz cassette could not be found. The adjustment could also be made by ear--being sure to turn only a little at a time--, if no test instruments are available, since boomboxes are not exactly high fidelity anyways. The azimuth screw should be locked with something like nail polish or Loctite afterwards.
Cassette unit sounded dull even after cleaning and demagnetization of the head. The music cassette sounded good on another boombox, so I could reasonably assume the cassette tape itself was good. I then made some low- level recordings (each a few seconds long and at -20 dB) at different frequencies starting with a 1000 Hz sine wave for reference purposes. I then made short 7,000, 8,000, and 9,000 Hz recordings. Already at 7,000 Hz the signal had dropped to 50 %. I then proceeded to make an azimuth adjustment with a flathead screwdriver and using a prerecorded 3,000 Hz cassette, because the 6,300 kHz cassette could not be found. The adjustment could also be made by ear--being sure to turn only a little at a time--, if no test instruments are available, since boomboxes are not exactly high fidelity anyways. The azimuth screw should be locked with something like nail polish or Loctite afterwards.
