Brute-force parameter search minimizes seat-to-seat bass variation

Evidence

Not long after the preceding events took place, I moved to California to work for Harman International as corporate vice president of acoustical engineering. I carried with me the notion of having substantial control of room resonances without the visual and real estate commitments to large bass traps. A room could be an ordinary room, visually and acoustically, with ordinary acoustical properties and problems, until the “play” button was pressed—then it could become extraordinary. … He first tackled the case of simple rectangular rooms, and after substantial analysis, involving simulations using from one to 5,000 subwoofers (acoustic wallpaper?), concluded that two or four subwoofers—identical, and identically driven—created a central zone in which seat-to-seat variations were usefully reduced (Welti, 2002a, 2002b). This means that equalization can benefit several listeners. — , Toole, Floyd E - Sound reproduction-…, 958 (#corroborates, via linked claim)

Categorization

• XREF: connects to: Seating that avoids low-order null lines reduces seat-to-seat variation — Toole, Floyd E, Sound reproduction- the acoustics and…, 1595; Multiple identical subwoofers reduce seat-to-seat bass variation — , Toole, Floyd E - Sound reproduction-…, 958; Sound Field Management extends bass optimization to irregularly shaped rooms.

Related

• Multiple identical subwoofers reduce seat-to-seat bass variation (similarity 0.89)
• Seating that avoids low-order null lines reduces seat-to-seat variation (similarity 0.86)
• Optimized multi-sub systems can use much smaller subs at some locations (similarity 0.83)
• Knowing any two of room dimensions, subwoofer layout, and seating enables optimizing the third. (similarity 0.81)
• Optimizing any two of room, subwoofer, and seating yields the third (similarity 0.81)
• Subwoofer arrays can be time-aligned and equalized to minimize seat-to-seat bass variation (similarity 0.81)
• Additional distributed subwoofers with optimization outperform EQ while using less power. (similarity 0.81)
• Subwoofer placement itself can be optimized alongside DSP settings (similarity 0.80)
• Multiple optimized subwoofers let a single global EQ filter flatten bass for every listener. (similarity 0.80)
• Computer-assisted search is needed to optimize bass in non-rectangular rooms (similarity 0.80)
• Equalizing only the low-Q resonance substantially improves subjective loudspeaker ratings. (similarity 0.80)
• Seats placed on room-mode null lines increase seat-to-seat bass variation. (similarity 0.80)
• Multiple independently-processed subwoofers tame room resonances for wider listening areas. (similarity 0.80)
• Subwoofer placement severely impacts the electrical power needed for equal low-bass output. (similarity 0.79)
• EQ cannot reduce seat-to-seat variation from a room mode (similarity 0.79)

Broader Connections

• Multiple identical subwoofers reduce seat-to-seat bass variation #corroborates (0.95) — , Toole, Floyd E - Sound reproduction-…, 958
• Sound Field Management extends bass optimization to irregularly shaped rooms. #expands (0.75)