Small speakers used in the today`s flat television set cabinets and the requirement for `invisible sound` lead to a frequency response which is influenced in a very disadvantageous way by the physical design constraints. Speakers are deeply embedded within the cabinet - the sound is thus forced through narrow vents, funnels or other waveguides. Down- or backfiring placements of the speakers are also common practice, in order to minimize the visibility of loudspeakers as much as possible. Generally, this leads to a non-flat frequency response with a strong coloration of the sound. We present an approach to compensate these effects by means of simple second order equalizer sections (`biquads`), where center frequency, gain and bandwidth of the equalizer sections are automatically calculated from a measured frequency response. The tool is usable in a laboratory environment, with relatively inexpensive standard PC sound cards and microphones.
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