Blaupunkt Frankfurt C70 Operating Instructions Manual page 34

Setting aid for the equalizer
Sound impression/problem
Bass reproduction too weak
Impure bass
Booming
Disagreeable pressure
Sound very dominant,
aggressive, no stereo effect
Muffled reproduction
Low transparency
No instrumental brilliance
What to do
Raise bass with
frequency: 32 to 160 Hz, filter: "LOW"
level: +4 to +6 dB
Reduce lower mid-section with
frequency: 400 Hz, filter: "LOW"
level: approx. -4 dB
Reduce mid-section with
frequency: 1,000 to 2,500 Hz, filter: "HIGH",
level: -4 to -6 dB
Raise tweeter range with
frequency: 6,300 to 10,000 Hz, filter: "HIGH",
level: +2 to +4 dB
EQUALIZER
69