Automatic equalization can create resonances by filling interference dips.

Evidence

Not to be overlooked is the fact that in (c) the automatic equalization process also filled the interference dip in the on-axis curve. This resulted in the addition of a resonance to the loudspeaker, which now shows up in the sound power curve. We will never know if the subjective scores would have been different if that had not happened. Human interpretation of the spinorama measurements is advisable; automatic equalization is not intelligent equalization. — Toole, Floyd E, Sound reproduction- the acoustics and…, 519

Categorization

Category: Contrarian or Surprising Claims

• QUESTION: Worth tracking whether newer DSP auto-EQ systems have learned to avoid this interference-dip trap.
• XREF: Connects to debates about room-correction DSP (Audyssey, Dirac) and their accuracy in real installations.

Related

• Automatic EQ can create unwanted resonances by filling interference dips (similarity 0.92)
• Room reflections cannot be corrected by electronic equalization (similarity 0.84)
• Matching room curves via EQ does not equalize audible sound quality. (similarity 0.84)
• Equalization masks a mode’s audibility but only for reproduced sound. (similarity 0.83)
• Most loudspeakers need equalization to correct low-frequency room resonances (similarity 0.83)
• Blind tests show any equalization improves subjective loudspeaker ratings (similarity 0.82)
• Sound power calculation mitigates low-frequency calibration errors from woofer displacement (similarity 0.81)
• Equalizing for a flat in-room response requires adding a high-frequency boost. (similarity 0.80)
• Smooth equalized room curves often signal degraded sound quality (similarity 0.80)
• Equalization only corrects sound at the measured position, not the physical resonance (similarity 0.80)
• Room resonances are minimum-phase and yield to frequency equalization (similarity 0.80)
• Minimum-phase loudspeaker resonances are correctable with parametric equalization. (similarity 0.80)
• Some professional monitors have resonance and directivity flaws no equalization can fix (similarity 0.80)
• Listeners respond to resonance spectral prominence, not decay rate reduction (similarity 0.79)
• A neutral loudspeaker can emulate many colored loudspeakers via equalization because woofers are minimum-phase (similarity 0.79)

Broader Connections

• Equalization masks a mode’s audibility but leaves the room itself untouched #complicates (0.85) — Toole, Floyd E, Sound reproduction- the acoustics and…, 1632