Zapco DC Intro - Manual (Page 17)

Equalization - Q
A “Q” of 0.5 affects a wide
range of frequencies from
50Hz to 15KHZ A “Q” of 10 affects a very
narrow band from 630Hz
to 1,600z
A “Q” of 2 affects a smaller
band of frequencies from about
300Hz to 4KHz
Being able to control the “Q” allows you to tailor your EQ curves to
your particular needs in each individual vehicle.
For best results in equalization: Cut when possible…
…. never boost if you can avoid it.