Press and hold the EQ button (or dedicated LD button) for 2 seconds to activate enhanced bass for low-volume listening.
If your search for "815" is coming up empty, check the right side of your unit for a paper tag. Most vintage Blaupunkt radios use a letter code series blaupunkt gmbh 815 manual
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While specific to the 815 series, standard Blaupunkt interface logic typically applies: : Manual : Press and hold the arrow buttons. Press and hold the EQ button (or dedicated