Loudspeaker resonances are the primary cause of poor sound quality.

Evidence

It is confirmed that resonances are the primary problem in loudspeakers. It is also learned that bass alone accounts for approximately 30% of overall sound quality ratings. As this is dominated by room resonances, it is clear that this is a problem that must be addressed in every individual listening room. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1224

Categorization

• XREF: Ties to room-acoustics control needs in both professional and consumer contexts.