but still a flat and boring sound?
interviewed by Peter Strassacker (7/2004)
Gerd, please tell us, when a loudspeaker shows a perfectly flat frequency
response, but reproduces a sound that is boring and superficial. What's the
cause? What can be done?
A listener perceives a loudspeaker with extremely flat frequency response
as boring and superficial, when compared to differently tuned (with reduced
midrange) speakers. The balance of a loudspeaker (described roughly as the
ratio of bass - midrange - tops) may be shifted to a certain degree, without
actually turning it into a better or worse speaker. Something can be done
to ensure that the speaker appeals to the listener. Let's disregard room acoustics,
otherwise it gets confusing) Usually, a sound balance with slight loudness
is perceived to be more three-dimensional and more open. Therefore, the sound
balance should be shifted towards a slight reduction of midrange.
Considering a typical 2 way speaker this can be done by increasing the longitudinal
inductance before mid / bass driver by 20% - 30% (as a guidance). Simultaneously,
the capacitor's value before the tweeter should be reduced equally.
As a result of these two changes the frequency response usually remains quite
even, without any major drops, but with a slight mid reduction of 1 - 2 dB.
Despite a rather small change the speaker sounds totally different with regard
to balance and depth.
Thanks very much, Gerd.